Help & Q&A

What it means: The controller is not receiving a valid motor Hall/phase signal, or the motor/controller circuit has a fault.

What to check:

1. Power off the scooter and inspect the motor cable, especially where it exits the axle.
2. Reseat the motor phase/Hall connectors and check for bent pins, moisture, or heat damage.
3. Lift the wheel and rotate it by hand; strong resistance, jerking, or grinding can indicate a phase/controller problem.
4. If the wiring is intact, test the motor Hall signals and controller with known-good parts.

If the issue remains: Do not continue riding with a motor/Hall fault. Have the motor and controller diagnosed together.

What it means: The throttle signal is outside its expected range or the throttle is not at the neutral position.

What to check:

1. Power the scooter off and make sure the throttle returns fully to its rest position without rubbing the grip or switch housing.
2. Restart without touching the throttle.
3. Inspect the throttle connector and cable for looseness, damage, water ingress, or a detached magnetic/sensor component.
4. If the fault returns, test or replace the throttle assembly.

Safety: Do not ride if the throttle sticks or the scooter accelerates without a deliberate throttle command.

If the issue remains: If a new throttle does not clear the fault, have the controller input and wiring harness checked.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The brake cut-off/lever signal is abnormal or the brake lever is not returning to its normal position.

What to check:

1. Release both brake levers fully and confirm they return smoothly.
2. Check the brake cut-off sensor/lever connector and cable for damage or a loose plug.
3. Power-cycle the scooter without holding either brake.
4. If the display still shows a brake fault, test the brake lever/sensor and related wiring.

Safety: Brake faults are safety-critical; do not ride until both mechanical braking and electrical cut-off behavior are normal.

If the issue remains: Replace the faulty brake lever/cut-off sensor or repair the wiring. Confirm normal braking before riding.

What it means: Battery voltage has fallen below the controller's safe operating threshold.

What to check:

1. Fully charge the battery with the correct charger and verify that the charger completes its normal cycle.
2. Inspect the battery/main connector and charging connector for poor contact or heat damage.
3. If the fault occurs mainly during acceleration or hills, the battery may be sagging under load.
4. Check the displayed voltage before and during load; a sudden large drop suggests battery, BMS, or high-resistance connection problems.

If the issue remains: Have the battery capacity, BMS, main connector, and controller input tested. Do not bypass low-voltage protection.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The motor has reached its thermal-protection threshold.

What to check:

1. Stop riding and allow the scooter to cool completely in a shaded, ventilated area.
2. Check for heavy load, long hill climbs, brake drag, low tire pressure, or repeated full-throttle operation that can cause excessive heating.
3. Inspect the motor area and related connectors for abnormal heat, loose mounting, or damage.
4. After cooling, restart and test gently.

If the issue remains: If the error returns quickly during normal riding, have the motor, wiring, and related sensors/controller circuitry checked.

What it means: The controller has reached its thermal-protection threshold.

What to check:

1. Stop riding and allow the scooter to cool completely in a shaded, ventilated area.
2. Check for heavy load, long hill climbs, brake drag, low tire pressure, or repeated full-throttle operation that can cause excessive heating.
3. Inspect the controller area and related connectors for abnormal heat, loose mounting, or damage.
4. After cooling, restart and test gently.

If the issue remains: If the error returns quickly during normal riding, have the controller, wiring, and related sensors/controller circuitry checked.

What it means: The steering bearing/headset, stem hardware, or cable routing may be dry, worn, overtightened, or damaged.

What to check:

1. Lift or unload the front end and turn the handlebar slowly from side to side.
2. Check whether cables are pulling tightly or rubbing as the handlebar turns.
3. Check the headset/bearing area for play, rough spots, clicking, or excessive preload.
4. Inspect the bearing cup and stem fasteners; if the bearings feel notchy or worn, replace the bearing set.

If the issue remains: Have the steering bearings and stem/folding assembly serviced before riding if steering is stiff, notchy, or has free play.

What it means: The stem/folding assembly or steering bearing has free play.

What to check:

1. With the scooter powered off, hold the front brake and gently rock the scooter to locate the source of the play.
2. Check the folding latch, stem fixing bolts, handlebar clamp, and headset/bearing adjustment.
3. Tighten only to the specified torque; overtightening the steering bearings can make steering stiff.
4. If the fixing hardware is tight but play remains, inspect the bearing cup/headset and folding components for wear.

Safety: Do not ride if the stem or folding mechanism has significant movement.

If the issue remains: Replace worn bearings or folding/stem parts if tightening does not remove the play.

What it means: The scooter is not receiving stable battery power at the display/controller, or the startup/control circuit is not completing.

What to check:

1. Fully charge the battery and confirm the charger behaves normally.
2. Check the main battery connector, power switch/key, fuse if fitted, display connector, and controller power connector.
3. Inspect for loose or overheated plugs and for water ingress.
4. If the wheel has unusually high resistance at the same time, stop testing and check the motor/controller for a shorted phase.

If the issue remains: Have the battery output, fuse/main harness, display, and controller checked in sequence.

What it means: The motor may spin with little load but cannot produce enough torque when the scooter is carrying weight. Possible causes include a motor phase/Hall issue, controller current limitation, battery voltage sag, or mechanical drag.

What to check:

1. Check tire pressure and make sure the brakes and wheel bearings are not dragging.
2. Fully charge the battery and observe whether the voltage drops sharply when acceleration is applied.
3. Inspect the motor phase/Hall connectors and the motor cable near the axle.
4. If the motor jerks, growls, or has poor torque, test the motor and controller together.

If the issue remains: Have the battery under-load voltage, controller output, and motor phase/Hall signals tested by the dealer.

What it means: Actual range is being reduced by battery state/age, low temperature, tire pressure, rider load, speed, hills, wind, frequent acceleration, or mechanical drag.

What to check:

1. Charge fully and compare range under similar riding conditions.
2. Set tires to the recommended pressure and check that both wheels spin freely without brake drag.
3. Test in moderate temperature using a lower riding mode and smoother acceleration.
4. If range has dropped suddenly, have battery capacity and voltage sag checked under load.

If the issue remains: A gradual reduction can be normal battery aging; a large sudden drop usually requires battery, brake-drag, motor, or controller diagnosis.

What it means: The display is not receiving a valid speed signal from the motor/controller.

What to check:

1. Check whether the scooter drives normally and whether an error code is also shown.
2. Inspect the motor Hall/phase connector, controller connector, and display communication cable.
3. Check the cable near the motor axle and folding/stem area for damage or a loose plug.
4. If speed appears only in one wheel direction, the motor Hall/speed signal or controller interpretation should be tested.

If the issue remains: Have the motor Hall signal, controller, and display communication line tested with diagnostic equipment.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The throttle signal is outside its expected range or the throttle is not at the neutral position.

What to check:

1. Power the scooter off and make sure the throttle returns fully to its rest position without rubbing the grip or switch housing.
2. Restart without touching the throttle.
3. Inspect the throttle connector and cable for looseness, damage, water ingress, or a detached magnetic/sensor component.
4. If the fault returns, test or replace the throttle assembly.

Safety: Do not ride if the throttle sticks or the scooter accelerates without a deliberate throttle command.

If the issue remains: If a new throttle does not clear the fault, have the controller input and wiring harness checked.

What it means: The controller is not receiving a valid motor Hall/phase signal, or the motor/controller circuit has a fault.

What to check:

1. Power off the scooter and inspect the motor cable, especially where it exits the axle.
2. Reseat the motor phase/Hall connectors and check for bent pins, moisture, or heat damage.
3. Lift the wheel and rotate it by hand; strong resistance, jerking, or grinding can indicate a phase/controller problem.
4. If the wiring is intact, test the motor Hall signals and controller with known-good parts.

If the issue remains: Do not continue riding with a motor/Hall fault. Have the motor and controller diagnosed together.

What it means: Battery voltage has fallen below the controller's safe operating threshold.

What to check:

1. Fully charge the battery with the correct charger and verify that the charger completes its normal cycle.
2. Inspect the battery/main connector and charging connector for poor contact or heat damage.
3. If the fault occurs mainly during acceleration or hills, the battery may be sagging under load.
4. Check the displayed voltage before and during load; a sudden large drop suggests battery, BMS, or high-resistance connection problems.

If the issue remains: Have the battery capacity, BMS, main connector, and controller input tested. Do not bypass low-voltage protection.

What it means: The brake cut-off/lever signal is abnormal or the brake lever is not returning to its normal position.

What to check:

1. Release both brake levers fully and confirm they return smoothly.
2. Check the brake cut-off sensor/lever connector and cable for damage or a loose plug.
3. Power-cycle the scooter without holding either brake.
4. If the display still shows a brake fault, test the brake lever/sensor and related wiring.

Safety: Brake faults are safety-critical; do not ride until both mechanical braking and electrical cut-off behavior are normal.

If the issue remains: Replace the faulty brake lever/cut-off sensor or repair the wiring. Confirm normal braking before riding.

What it means: The controller is not receiving a valid motor Hall/phase signal, or the motor/controller circuit has a fault.

What to check:

1. Power off the scooter and inspect the motor cable, especially where it exits the axle.
2. Reseat the motor phase/Hall connectors and check for bent pins, moisture, or heat damage.
3. Lift the wheel and rotate it by hand; strong resistance, jerking, or grinding can indicate a phase/controller problem.
4. If the wiring is intact, test the motor Hall signals and controller with known-good parts.

If the issue remains: Do not continue riding with a motor/Hall fault. Have the motor and controller diagnosed together.

What it means: The throttle signal is outside its expected range or the throttle is not at the neutral position.

What to check:

1. Power the scooter off and make sure the throttle returns fully to its rest position without rubbing the grip or switch housing.
2. Restart without touching the throttle.
3. Inspect the throttle connector and cable for looseness, damage, water ingress, or a detached magnetic/sensor component.
4. If the fault returns, test or replace the throttle assembly.

Safety: Do not ride if the throttle sticks or the scooter accelerates without a deliberate throttle command.

If the issue remains: If a new throttle does not clear the fault, have the controller input and wiring harness checked.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The brake cut-off/lever signal is abnormal or the brake lever is not returning to its normal position.

What to check:

1. Release both brake levers fully and confirm they return smoothly.
2. Check the brake cut-off sensor/lever connector and cable for damage or a loose plug.
3. Power-cycle the scooter without holding either brake.
4. If the display still shows a brake fault, test the brake lever/sensor and related wiring.

Safety: Brake faults are safety-critical; do not ride until both mechanical braking and electrical cut-off behavior are normal.

If the issue remains: Replace the faulty brake lever/cut-off sensor or repair the wiring. Confirm normal braking before riding.

What it means: Battery voltage has fallen below the controller's safe operating threshold.

What to check:

1. Fully charge the battery with the correct charger and verify that the charger completes its normal cycle.
2. Inspect the battery/main connector and charging connector for poor contact or heat damage.
3. If the fault occurs mainly during acceleration or hills, the battery may be sagging under load.
4. Check the displayed voltage before and during load; a sudden large drop suggests battery, BMS, or high-resistance connection problems.

If the issue remains: Have the battery capacity, BMS, main connector, and controller input tested. Do not bypass low-voltage protection.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The controller has reached its thermal-protection threshold.

What to check:

1. Stop riding and allow the scooter to cool completely in a shaded, ventilated area.
2. Check for heavy load, long hill climbs, brake drag, low tire pressure, or repeated full-throttle operation that can cause excessive heating.
3. Inspect the controller area and related connectors for abnormal heat, loose mounting, or damage.
4. After cooling, restart and test gently.

If the issue remains: If the error returns quickly during normal riding, have the controller, wiring, and related sensors/controller circuitry checked.

What it means: The scooter is not receiving stable battery power at the display/controller, or the startup/control circuit is not completing.

What to check:

1. Fully charge the battery and confirm the charger behaves normally.
2. Check the main battery connector, power switch/key, fuse if fitted, display connector, and controller power connector.
3. Inspect for loose or overheated plugs and for water ingress.
4. If the wheel has unusually high resistance at the same time, stop testing and check the motor/controller for a shorted phase.

If the issue remains: Have the battery output, fuse/main harness, display, and controller checked in sequence.

What it means: Actual range is being reduced by battery state/age, low temperature, tire pressure, rider load, speed, hills, wind, frequent acceleration, or mechanical drag.

What to check:

1. Charge fully and compare range under similar riding conditions.
2. Set tires to the recommended pressure and check that both wheels spin freely without brake drag.
3. Test in moderate temperature using a lower riding mode and smoother acceleration.
4. If range has dropped suddenly, have battery capacity and voltage sag checked under load.

If the issue remains: A gradual reduction can be normal battery aging; a large sudden drop usually requires battery, brake-drag, motor, or controller diagnosis.

What it means: The controller is not receiving a valid motor Hall/phase signal, or the motor/controller circuit has a fault.

What to check:

1. Power off the scooter and inspect the motor cable, especially where it exits the axle.
2. Reseat the motor phase/Hall connectors and check for bent pins, moisture, or heat damage.
3. Lift the wheel and rotate it by hand; strong resistance, jerking, or grinding can indicate a phase/controller problem.
4. If the wiring is intact, test the motor Hall signals and controller with known-good parts.

If the issue remains: Do not continue riding with a motor/Hall fault. Have the motor and controller diagnosed together.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The throttle signal is outside its expected range or the throttle is not at the neutral position.

What to check:

1. Power the scooter off and make sure the throttle returns fully to its rest position without rubbing the grip or switch housing.
2. Restart without touching the throttle.
3. Inspect the throttle connector and cable for looseness, damage, water ingress, or a detached magnetic/sensor component.
4. If the fault returns, test or replace the throttle assembly.

Safety: Do not ride if the throttle sticks or the scooter accelerates without a deliberate throttle command.

If the issue remains: If a new throttle does not clear the fault, have the controller input and wiring harness checked.

What it means: The brake cut-off/lever signal is abnormal or the brake lever is not returning to its normal position.

What to check:

1. Release both brake levers fully and confirm they return smoothly.
2. Check the brake cut-off sensor/lever connector and cable for damage or a loose plug.
3. Power-cycle the scooter without holding either brake.
4. If the display still shows a brake fault, test the brake lever/sensor and related wiring.

Safety: Brake faults are safety-critical; do not ride until both mechanical braking and electrical cut-off behavior are normal.

If the issue remains: Replace the faulty brake lever/cut-off sensor or repair the wiring. Confirm normal braking before riding.

What it means: The battery gauge and the measured pack voltage are not matching, or the scooter is reporting a battery-voltage fault.

What to check:

1. Turn the scooter off, charge the battery fully with the correct original-spec charger, then power it on again.
2. Check the battery connector and charging connector for looseness, bent pins, heat marks, oxidation, or moisture.
3. Compare the display voltage with a safe battery measurement made by a qualified person. A large difference can indicate a display, wiring, BMS, or battery problem.
4. If the voltage drops sharply as soon as the throttle is applied, stop riding and have the battery checked under load.

Safety: Stop using the scooter if the battery is swollen, unusually hot, damaged, smells abnormal, or shows signs of water ingress.

If the issue remains: Have the battery, BMS, main wiring, and display/controller voltage signal checked by the dealer. Do not open or repair the lithium battery pack yourself.

What it means: The wheel, axle spacers, brake disc, or front fork may be misaligned, preventing the wheel from seating correctly.

What to check:

1. Do not force the wheel into place. Confirm the left/right spacers, washers, and axle hardware are installed in the correct order.
2. Check whether the brake disc is entering the caliper correctly and whether the caliper is blocking installation.
3. Compare the fork legs from the front. If they are visibly twisted, uneven, or too narrow/wide, stop assembly.
4. Inspect the axle and wheel bearings for damage or deformation.

Safety: Do not ride with a bent fork, damaged axle, or incorrectly seated front wheel.

If the issue remains: If the fork is bent or the wheel cannot sit squarely, replace the damaged part or have the front assembly inspected by an authorized service technician.

What it means: The noise may come from brake rub, wheel bearings, the motor, a loose fastener, or the motor/controller electrical system.

What to check:

1. Lift the drive wheel and rotate it by hand with the scooter powered off. Check for brake-disc rubbing or a rough bearing feel.
2. Check axle hardware and motor cable routing, especially where the cable exits the axle.
3. Run the wheel briefly unloaded and note whether the sound changes with speed or throttle.
4. If the wheel has strong resistance, jerks, or makes an electrical growling sound, stop testing and inspect the motor phase/Hall wiring and controller.

If the issue remains: Have the motor, bearings, brake assembly, and controller checked if the noise is pronounced or accompanied by vibration, heat, or loss of power.

What it means: The controller is not receiving a valid motor Hall/phase signal, or the motor/controller circuit has a fault.

What to check:

1. Power off the scooter and inspect the motor cable, especially where it exits the axle.
2. Reseat the motor phase/Hall connectors and check for bent pins, moisture, or heat damage.
3. Lift the wheel and rotate it by hand; strong resistance, jerking, or grinding can indicate a phase/controller problem.
4. If the wiring is intact, test the motor Hall signals and controller with known-good parts.

If the issue remains: Do not continue riding with a motor/Hall fault. Have the motor and controller diagnosed together.

What it means: The throttle signal is outside its expected range or the throttle is not at the neutral position.

What to check:

1. Power the scooter off and make sure the throttle returns fully to its rest position without rubbing the grip or switch housing.
2. Restart without touching the throttle.
3. Inspect the throttle connector and cable for looseness, damage, water ingress, or a detached magnetic/sensor component.
4. If the fault returns, test or replace the throttle assembly.

Safety: Do not ride if the throttle sticks or the scooter accelerates without a deliberate throttle command.

If the issue remains: If a new throttle does not clear the fault, have the controller input and wiring harness checked.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: Battery voltage has fallen below the controller's safe operating threshold.

What to check:

1. Fully charge the battery with the correct charger and verify that the charger completes its normal cycle.
2. Inspect the battery/main connector and charging connector for poor contact or heat damage.
3. If the fault occurs mainly during acceleration or hills, the battery may be sagging under load.
4. Check the displayed voltage before and during load; a sudden large drop suggests battery, BMS, or high-resistance connection problems.

If the issue remains: Have the battery capacity, BMS, main connector, and controller input tested. Do not bypass low-voltage protection.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The motor has reached its thermal-protection threshold.

What to check:

1. Stop riding and allow the scooter to cool completely in a shaded, ventilated area.
2. Check for heavy load, long hill climbs, brake drag, low tire pressure, or repeated full-throttle operation that can cause excessive heating.
3. Inspect the motor area and related connectors for abnormal heat, loose mounting, or damage.
4. After cooling, restart and test gently.

If the issue remains: If the error returns quickly during normal riding, have the motor, wiring, and related sensors/controller circuitry checked.

What it means: The scooter is not receiving stable battery power at the display/controller, or the startup/control circuit is not completing.

What to check:

1. Fully charge the battery and confirm the charger behaves normally.
2. Check the main battery connector, power switch/key, fuse if fitted, display connector, and controller power connector.
3. Inspect for loose or overheated plugs and for water ingress.
4. If the wheel has unusually high resistance at the same time, stop testing and check the motor/controller for a shorted phase.

If the issue remains: Have the battery output, fuse/main harness, display, and controller checked in sequence.

What it means: Actual range is being reduced by battery state/age, low temperature, tire pressure, rider load, speed, hills, wind, frequent acceleration, or mechanical drag.

What to check:

1. Charge fully and compare range under similar riding conditions.
2. Set tires to the recommended pressure and check that both wheels spin freely without brake drag.
3. Test in moderate temperature using a lower riding mode and smoother acceleration.
4. If range has dropped suddenly, have battery capacity and voltage sag checked under load.

If the issue remains: A gradual reduction can be normal battery aging; a large sudden drop usually requires battery, brake-drag, motor, or controller diagnosis.

What it means: The lighting command is not reaching the ambient-light circuit, or the lighting module is not responding.

What to check:

1. Power-cycle the scooter and try the double-click again with the scooter stationary.
2. Check that the headlight button itself works normally and that the main lighting functions respond.
3. Inspect the handlebar/display cable and lighting-module connectors for loose plugs or damaged pins.
4. If only the ambient-light color function is affected, the ambient-light controller/module may require replacement.

If the issue remains: Ask the dealer to test the handlebar switch, display output, lighting module, and related wiring.

What it means: The controller detects that the motor cannot rotate normally or that a phase/motor condition is preventing rotation.

What to check:

1. Power off the scooter and check whether the wheel can rotate by hand.
2. Make sure the brake is not locked and the tire/fender is not physically jammed.
3. Inspect the motor phase/Hall connector and cable near the axle.
4. If the wheel has strong magnetic resistance or jerks, the motor phases or controller MOSFET stage may be faulty.

If the issue remains: Stop riding and have the motor/controller diagnosed if the stall error returns.

What it means: The battery/controller is detecting voltage above the normal operating limit.

What to check:

1. Stop charging and confirm the charger voltage rating matches the scooter battery.
2. Restart only after disconnecting the charger.
3. Have the actual battery voltage safely verified.
4. Check whether regenerative braking immediately after a full charge is causing the voltage to rise.

Safety: Do not use a charger with a higher voltage than the original specification.

If the issue remains: If the actual pack voltage is too high, stop using the scooter and have the charger, battery, and BMS inspected.

What it means: Battery voltage has fallen below the controller's safe operating threshold.

What to check:

1. Fully charge the battery with the correct charger and verify that the charger completes its normal cycle.
2. Inspect the battery/main connector and charging connector for poor contact or heat damage.
3. If the fault occurs mainly during acceleration or hills, the battery may be sagging under load.
4. Check the displayed voltage before and during load; a sudden large drop suggests battery, BMS, or high-resistance connection problems.

If the issue remains: Have the battery capacity, BMS, main connector, and controller input tested. Do not bypass low-voltage protection.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The brake cut-off/lever signal is abnormal or the brake lever is not returning to its normal position.

What to check:

1. Release both brake levers fully and confirm they return smoothly.
2. Check the brake cut-off sensor/lever connector and cable for damage or a loose plug.
3. Power-cycle the scooter without holding either brake.
4. If the display still shows a brake fault, test the brake lever/sensor and related wiring.

Safety: Brake faults are safety-critical; do not ride until both mechanical braking and electrical cut-off behavior are normal.

If the issue remains: Replace the faulty brake lever/cut-off sensor or repair the wiring. Confirm normal braking before riding.

What it means: The throttle signal is outside its expected range or the throttle is not at the neutral position.

What to check:

1. Power the scooter off and make sure the throttle returns fully to its rest position without rubbing the grip or switch housing.
2. Restart without touching the throttle.
3. Inspect the throttle connector and cable for looseness, damage, water ingress, or a detached magnetic/sensor component.
4. If the fault returns, test or replace the throttle assembly.

Safety: Do not ride if the throttle sticks or the scooter accelerates without a deliberate throttle command.

If the issue remains: If a new throttle does not clear the fault, have the controller input and wiring harness checked.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The controller is not receiving a valid motor Hall/phase signal, or the motor/controller circuit has a fault.

What to check:

1. Power off the scooter and inspect the motor cable, especially where it exits the axle.
2. Reseat the motor phase/Hall connectors and check for bent pins, moisture, or heat damage.
3. Lift the wheel and rotate it by hand; strong resistance, jerking, or grinding can indicate a phase/controller problem.
4. If the wiring is intact, test the motor Hall signals and controller with known-good parts.

If the issue remains: Do not continue riding with a motor/Hall fault. Have the motor and controller diagnosed together.

What it means: The display is not completing its normal startup/readout sequence or is receiving an abnormal power/communication signal.

What to check:

1. Turn the scooter off completely, wait at least 30 seconds, and restart it.
2. Check the display connector and the main communication cable for a loose or partially inserted plug.
3. Inspect connectors for moisture, bent pins, or cable damage around the folding/stem area.
4. If the display still remains on '88', test with a known-good display or communication cable if available.

If the issue remains: The display, cable, or controller communication circuit should be tested by the dealer.

What it means: The scooter powers on but the drive system is not accepting or delivering a valid throttle command.

What to check:

1. Check for any error code, lock icon, brake icon, kick-start/zero-start setting, or parking mode.
2. Release both brake levers and confirm the throttle returns to neutral.
3. Check the throttle, brake cut-off, motor, and controller connectors.
4. If the motor only jerks or makes noise, inspect the motor Hall/phase circuit and controller.

If the issue remains: Have the throttle, brake cut-off circuit, motor, and controller tested if the scooter still will not drive.

What it means: The throttle is not mechanically returning to its neutral position or the throttle sensor signal is sticking.

What to check:

1. Turn the scooter off and check that the throttle moves freely and springs back immediately when released.
2. Make sure the grip, brake lever, or switch housing is not rubbing against the throttle.
3. Inspect the throttle cable and connector for pinching, damage, or water ingress.
4. Do not lubricate the electronic sensor internally unless the manufacturer specifically instructs it.

Safety: A throttle that does not return to neutral is a safety-critical fault.

If the issue remains: Replace the throttle assembly if it does not return reliably. Do not ride with a sticking throttle.

What it means: The small indicator usually appears when a display function or status mode has been activated.

What to check:

1. Restart the scooter and check whether the icon clears.
2. Review the display's riding-mode, cruise, lock, Bluetooth/NFC, and settings status.
3. If the scooter otherwise operates normally, the icon is usually a status indication rather than a motor fault.
4. If it appears together with abnormal riding behavior, photograph the display and send it to your dealer for identification.

If the issue remains: Use the model-specific display manual or dealer support to identify the exact indicator for your display version.

What it means: The scooter is in an electronic lock, password, NFC, or anti-theft state.

What to check:

1. Use the normal unlock method for your model: display password, NFC card, or app unlock if supported.
2. Power the scooter off and on, then retry the unlock procedure.
3. Confirm that the NFC card/app account belongs to this scooter and that the display has not been replaced with an unpaired unit.
4. If the lock remains, do not repeatedly enter random codes.

If the issue remains: Contact the dealer with proof of ownership so they can provide the correct reset or pairing procedure for the installed display.

What it means: The scooter is not receiving stable battery power at the display/controller, or the startup/control circuit is not completing.

What to check:

1. Fully charge the battery and confirm the charger behaves normally.
2. Check the main battery connector, power switch/key, fuse if fitted, display connector, and controller power connector.
3. Inspect for loose or overheated plugs and for water ingress.
4. If the wheel has unusually high resistance at the same time, stop testing and check the motor/controller for a shorted phase.

If the issue remains: Have the battery output, fuse/main harness, display, and controller checked in sequence.

What it means: If the low-voltage error remains with a known-good battery, the cause is likely outside the battery itself.

What to check:

1. Confirm the replacement battery is the correct voltage and is fully charged.
2. Inspect the main battery connector, fuse, wiring harness, and controller power input for voltage drop or poor contact.
3. Check the display/controller voltage setting and communication cable.
4. Measure voltage at the controller input under load to identify where the drop occurs.

If the issue remains: Have the main harness, controller voltage-sensing circuit, and display/controller communication checked by the dealer.

What it means: The steering bearing/headset, stem hardware, or cable routing may be dry, worn, overtightened, or damaged.

What to check:

1. Lift or unload the front end and turn the handlebar slowly from side to side.
2. Check whether cables are pulling tightly or rubbing as the handlebar turns.
3. Check the headset/bearing area for play, rough spots, clicking, or excessive preload.
4. Inspect the bearing cup and stem fasteners; if the bearings feel notchy or worn, replace the bearing set.

If the issue remains: Have the steering bearings and stem/folding assembly serviced before riding if steering is stiff, notchy, or has free play.

What it means: The display touch panel is not detecting input, or the display has a power/software/connection problem.

What to check:

1. Dry and clean the display surface and remove gloves, water, dirt, or a screen film that may interfere with touch input.
2. Power-cycle the scooter and wait for the display to finish starting before touching the controls.
3. Check the display connector and main communication cable.
4. If only one touch area fails consistently, the touch panel itself may be damaged.

If the issue remains: Replace or service the display if the touch panel remains unresponsive after the wiring and power supply are confirmed.

What it means: Noise from the front wheel can come from the brake disc, bearings, axle hardware, tire, or wheel alignment.

What to check:

1. Lift the front wheel and rotate it by hand. Listen for scraping, clicking, grinding, or side-to-side rubbing.
2. Check whether the brake disc is rubbing the pads and whether the wheel is centered in the fork.
3. Check axle nuts/bolts and wheel bearings for looseness or play.
4. Inspect the tire for embedded debris, deformation, or contact with the fender.

If the issue remains: If the bearing feels rough, the disc is badly bent, or the wheel has play, service the wheel before riding.

What it means: Suspension noise can come from loose mounting hardware, dry bushings, internal shock wear, or contact between surrounding parts.

What to check:

1. With the scooter powered off, compress the suspension slowly and identify whether the noise comes from the shock or its mounting points.
2. Check shock mounting bolts, bushings, and nearby fender/body parts for looseness or contact.
3. Inspect for oil leakage, bent parts, or excessive side play.
4. If the noise is internal, avoid disassembling a sealed damper unless you have the correct service procedure.

If the issue remains: Service or replace the shock/bushings if the noise persists or if damping feels weak or inconsistent.

What it means: The noise may come from brake rub, wheel bearings, the motor, a loose fastener, or the motor/controller electrical system.

What to check:

1. Lift the drive wheel and rotate it by hand with the scooter powered off. Check for brake-disc rubbing or a rough bearing feel.
2. Check axle hardware and motor cable routing, especially where the cable exits the axle.
3. Run the wheel briefly unloaded and note whether the sound changes with speed or throttle.
4. If the wheel has strong resistance, jerks, or makes an electrical growling sound, stop testing and inspect the motor phase/Hall wiring and controller.

If the issue remains: Have the motor, bearings, brake assembly, and controller checked if the noise is pronounced or accompanied by vibration, heat, or loss of power.

What it means: The battery gauge and the measured pack voltage are not matching, or the scooter is reporting a battery-voltage fault.

What to check:

1. Turn the scooter off, charge the battery fully with the correct original-spec charger, then power it on again.
2. Check the battery connector and charging connector for looseness, bent pins, heat marks, oxidation, or moisture.
3. Compare the display voltage with a safe battery measurement made by a qualified person. A large difference can indicate a display, wiring, BMS, or battery problem.
4. If the voltage drops sharply as soon as the throttle is applied, stop riding and have the battery checked under load.

Safety: Stop using the scooter if the battery is swollen, unusually hot, damaged, smells abnormal, or shows signs of water ingress.

If the issue remains: Have the battery, BMS, main wiring, and display/controller voltage signal checked by the dealer. Do not open or repair the lithium battery pack yourself.

What it means: The controller is not receiving a valid motor Hall/phase signal, or the motor/controller circuit has a fault.

What to check:

1. Power off the scooter and inspect the motor cable, especially where it exits the axle.
2. Reseat the motor phase/Hall connectors and check for bent pins, moisture, or heat damage.
3. Lift the wheel and rotate it by hand; strong resistance, jerking, or grinding can indicate a phase/controller problem.
4. If the wiring is intact, test the motor Hall signals and controller with known-good parts.

If the issue remains: Do not continue riding with a motor/Hall fault. Have the motor and controller diagnosed together.

What it means: The throttle signal is outside its expected range or the throttle is not at the neutral position.

What to check:

1. Power the scooter off and make sure the throttle returns fully to its rest position without rubbing the grip or switch housing.
2. Restart without touching the throttle.
3. Inspect the throttle connector and cable for looseness, damage, water ingress, or a detached magnetic/sensor component.
4. If the fault returns, test or replace the throttle assembly.

Safety: Do not ride if the throttle sticks or the scooter accelerates without a deliberate throttle command.

If the issue remains: If a new throttle does not clear the fault, have the controller input and wiring harness checked.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The scooter is reporting an abnormal battery, charging, or voltage condition.

What to check:

1. Charge the battery with the correct original-spec charger and observe the charger indicator.
2. Inspect the charging port, battery connector, and main wiring for looseness, heat, or moisture.
3. Check whether the error appears only under acceleration, which can indicate voltage sag.
4. If possible, have the battery voltage and capacity tested by the dealer.

If the issue remains: Service or replace the battery/BMS, charger, or damaged wiring after diagnosis. Do not open the lithium battery pack yourself.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The controller has reached its thermal-protection threshold.

What to check:

1. Stop riding and allow the scooter to cool completely in a shaded, ventilated area.
2. Check for heavy load, long hill climbs, brake drag, low tire pressure, or repeated full-throttle operation that can cause excessive heating.
3. Inspect the controller area and related connectors for abnormal heat, loose mounting, or damage.
4. After cooling, restart and test gently.

If the issue remains: If the error returns quickly during normal riding, have the controller, wiring, and related sensors/controller circuitry checked.

What it means: The brake rotor is rubbing the pads because the caliper is misaligned, the wheel is not centered, or the rotor is slightly bent.

What to check:

1. Lift the wheel and rotate it to identify whether the rubbing is continuous or only at one point.
2. Confirm the wheel/axle is seated correctly and tightened evenly.
3. Center the brake caliper around the rotor. If rubbing occurs only at one rotor position, inspect the rotor for lateral runout.
4. Check that the pads retract and that no debris is trapped between the pad and rotor.

If the issue remains: Realign the caliper or replace/true a significantly bent rotor. If you are unsure about brake adjustment, use a dealer or qualified mechanic.

What it means: Air loss can be caused by a puncture, valve leak, bead leak, damaged rim, or an incorrectly seated tire/tube.

What to check:

1. Inflate the tire to the specified pressure and use soapy water to look for bubbles around the tread, sidewall, valve, and bead.
2. Check the valve core for looseness and inspect the valve stem for damage.
3. For tubed tires, remove and patch/replace the inner tube after finding the puncture source.
4. For tubeless tires, inspect the bead and rim sealing surface and repair the puncture with an appropriate method.

If the issue remains: Replace a tire with sidewall cuts, exposed cords, severe bead damage, or repeated air loss.

What it means: The scooter is not receiving stable battery power at the display/controller, or the startup/control circuit is not completing.

What to check:

1. Fully charge the battery and confirm the charger behaves normally.
2. Check the main battery connector, power switch/key, fuse if fitted, display connector, and controller power connector.
3. Inspect for loose or overheated plugs and for water ingress.
4. If the wheel has unusually high resistance at the same time, stop testing and check the motor/controller for a shorted phase.

If the issue remains: Have the battery output, fuse/main harness, display, and controller checked in sequence.

What it means: Actual range is being reduced by battery state/age, low temperature, tire pressure, rider load, speed, hills, wind, frequent acceleration, or mechanical drag.

What to check:

1. Charge fully and compare range under similar riding conditions.
2. Set tires to the recommended pressure and check that both wheels spin freely without brake drag.
3. Test in moderate temperature using a lower riding mode and smoother acceleration.
4. If range has dropped suddenly, have battery capacity and voltage sag checked under load.

If the issue remains: A gradual reduction can be normal battery aging; a large sudden drop usually requires battery, brake-drag, motor, or controller diagnosis.

What it means: The charging path is not delivering power to the battery, or the battery/BMS is refusing charge.

What to check:

1. Verify the wall outlet and charger indicator, and confirm the charger is the correct voltage for this model.
2. Inspect the charging port and plug for looseness, contamination, bent pins, or heat damage.
3. Allow a very hot or very cold battery to return to room temperature before charging.
4. If available, test with a known-good correct-spec charger. If the charger is good, the charging port, fuse, battery wiring, or BMS requires inspection.

Safety: Stop charging immediately if the battery or charger becomes unusually hot, swollen, damaged, or produces an abnormal smell.

If the issue remains: Have the battery and charging circuit checked by the dealer. Do not bypass the BMS or charging fuse.

What it means: The noise may come from brake rub, wheel bearings, the motor, a loose fastener, or the motor/controller electrical system.

What to check:

1. Lift the drive wheel and rotate it by hand with the scooter powered off. Check for brake-disc rubbing or a rough bearing feel.
2. Check axle hardware and motor cable routing, especially where the cable exits the axle.
3. Run the wheel briefly unloaded and note whether the sound changes with speed or throttle.
4. If the wheel has strong resistance, jerks, or makes an electrical growling sound, stop testing and inspect the motor phase/Hall wiring and controller.

If the issue remains: Have the motor, bearings, brake assembly, and controller checked if the noise is pronounced or accompanied by vibration, heat, or loss of power.

What it means: The lighting circuit is not receiving power or control, or the light board/module has failed.

What to check:

1. Check whether the display shows that the lights are switched on.
2. Inspect the headlight, lighting-module, handlebar-switch, and main harness connectors.
3. Look for damaged wires around the stem/folding area and for moisture in connectors.
4. If every light is off at the same time, check the common lighting power/converter or light-control module before replacing individual lamps.

If the issue remains: Replace the failed lighting module, switch, wiring section, or lamp after the power supply is confirmed.

What it means: The turn-signal switch, lamp/module, wiring, or shared accessory power may be faulty.

What to check:

1. Check left and right signals separately and note whether only one side or both sides fail.
2. Inspect the handlebar switch connector and the front/rear turn-signal connectors.
3. Check for broken wires where the harness bends at the stem or rear frame.
4. If both sides fail, check the common turn-signal power/control module before replacing individual lights.

If the issue remains: Have the switch, wiring, and light-control module tested if the signals still do not operate.

What it means: Missing segments, icons, or partial display output usually indicates a display-panel fault, unstable power supply, or communication issue.

What to check:

1. Restart the scooter and observe whether the display is incomplete from the first startup screen.
2. Check the display connector and main communication cable for loose pins or moisture.
3. If the scooter functions normally but the same LCD/LED segments remain missing, the display module is likely defective.
4. If the display changes together with communication errors, test the controller/display communication line.

If the issue remains: Replace the display if the panel itself is defective; otherwise repair the wiring or controller communication fault.

What it means: The rear light is not receiving power/control or the rear lamp/wiring has failed.

What to check:

1. Check whether the brake light and normal tail-light functions both fail or only one function is affected.
2. Inspect the rear-light connector and wiring where it passes through the rear fender/frame.
3. Check the brake lever cut-off signal if the brake-light function alone is affected.
4. Confirm the accessory-lighting power supply is present.

If the issue remains: Replace the rear lamp, damaged harness, or lighting-control component after the circuit is checked.

What it means: The throttle signal is outside its expected range or the throttle is not at the neutral position.

What to check:

1. Power the scooter off and make sure the throttle returns fully to its rest position without rubbing the grip or switch housing.
2. Restart without touching the throttle.
3. Inspect the throttle connector and cable for looseness, damage, water ingress, or a detached magnetic/sensor component.
4. If the fault returns, test or replace the throttle assembly.

Safety: Do not ride if the throttle sticks or the scooter accelerates without a deliberate throttle command.

If the issue remains: If a new throttle does not clear the fault, have the controller input and wiring harness checked.

What it means: A structural or load-bearing component has physically failed.

What to check:

1. Stop riding immediately and do not attempt a temporary high-speed repair.
2. Photograph the damaged part and surrounding area to check whether other components were also stressed.
3. Replace the broken component with the correct original-spec part and new required fasteners.
4. After replacement, verify wheel alignment, axle security, folding/stem alignment, and brake operation as applicable.

Safety: Structural cracks, broken axle/motor-hub parts, and broken frame/folding fasteners are safety-critical.

If the issue remains: Have the repair inspected by a qualified technician before returning the scooter to normal riding.

What it means: The horn/speaker command may be stuck because of a switch, wiring, moisture, or control-module fault.

What to check:

1. Turn the scooter off and check whether the horn button is physically stuck or being pressed by the switch housing.
2. Inspect the horn-button cable and handlebar wiring for pinching or water ingress.
3. Disconnect and reconnect the relevant handlebar/display plug with the power off.
4. If the horn starts sounding immediately after power-on, the switch module or control signal should be tested.

If the issue remains: Replace the faulty switch, wiring harness, or horn/control module as required. Do not continue riding if the horn cannot be controlled.

What it means: Voltage measurement helps distinguish a charger fault from a battery/BMS or display-reading problem.

What to check:

1. Use a correctly rated digital multimeter and select DC voltage above the expected scooter voltage.
2. Measure the charger output only at the specified output contacts and avoid allowing the probes to touch each other.
3. Battery-pack voltage should be measured only by a person familiar with the connector pinout and lithium-battery safety.
4. Compare the measured value with the charger label, battery specification, and display reading.

Safety: A short circuit at a lithium-battery connector can cause burns, arcing, or battery damage.

If the issue remains: If you are not trained to measure high-current battery connectors safely, ask the dealer to perform the measurement.

What it means: Free-spin speed and real riding speed are not expected to be identical because rider load, battery voltage, tire pressure, road gradient, temperature, and controller limits all affect speed.

What to check:

1. Verify tire pressure, battery charge, riding mode, and any speed-limit setting.
2. Compare speed using the same battery state and flat-road conditions.
3. Confirm the display wheel-size/speed parameters have not been changed.
4. If speed is dramatically below specification together with weak acceleration, check battery voltage sag, brake drag, motor, and controller.

If the issue remains: A small difference is normal; a large or sudden loss of speed should be diagnosed as a battery, motor, controller, or mechanical-drag issue.

What it means: Free-spin speed and real riding speed are not expected to be identical because rider load, battery voltage, tire pressure, road gradient, temperature, and controller limits all affect speed.

What to check:

1. Verify tire pressure, battery charge, riding mode, and any speed-limit setting.
2. Compare speed using the same battery state and flat-road conditions.
3. Confirm the display wheel-size/speed parameters have not been changed.
4. If speed is dramatically below specification together with weak acceleration, check battery voltage sag, brake drag, motor, and controller.

If the issue remains: A small difference is normal; a large or sudden loss of speed should be diagnosed as a battery, motor, controller, or mechanical-drag issue.

What it means: A buzzing or abnormal sound after replacing the headlight and adapter cable suggests the noise is being generated by the power supply, converter, switch signal, or replacement light itself.

What to check:

1. Confirm the replacement headlight and adapter are the correct voltage/specification for the scooter.
2. Inspect the lighting connector and DC converter/module for poor contact or heat marks.
3. Test the headlight with the scooter stationary and compare the sound with the light switched off.
4. If possible, test with a known-good light/module one component at a time.

If the issue remains: The lighting power module, display/switch output, or headlight should be replaced after confirming which component produces the noise.

What it means: The controller is not receiving a valid motor Hall/phase signal, or the motor/controller circuit has a fault.

What to check:

1. Power off the scooter and inspect the motor cable, especially where it exits the axle.
2. Reseat the motor phase/Hall connectors and check for bent pins, moisture, or heat damage.
3. Lift the wheel and rotate it by hand; strong resistance, jerking, or grinding can indicate a phase/controller problem.
4. If the wiring is intact, test the motor Hall signals and controller with known-good parts.

If the issue remains: Do not continue riding with a motor/Hall fault. Have the motor and controller diagnosed together.

What it means: The throttle signal is outside its expected range or the throttle is not at the neutral position.

What to check:

1. Power the scooter off and make sure the throttle returns fully to its rest position without rubbing the grip or switch housing.
2. Restart without touching the throttle.
3. Inspect the throttle connector and cable for looseness, damage, water ingress, or a detached magnetic/sensor component.
4. If the fault returns, test or replace the throttle assembly.

Safety: Do not ride if the throttle sticks or the scooter accelerates without a deliberate throttle command.

If the issue remains: If a new throttle does not clear the fault, have the controller input and wiring harness checked.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The scooter is reporting an abnormal battery, charging, or voltage condition.

What to check:

1. Charge the battery with the correct original-spec charger and observe the charger indicator.
2. Inspect the charging port, battery connector, and main wiring for looseness, heat, or moisture.
3. Check whether the error appears only under acceleration, which can indicate voltage sag.
4. If possible, have the battery voltage and capacity tested by the dealer.

If the issue remains: Service or replace the battery/BMS, charger, or damaged wiring after diagnosis. Do not open the lithium battery pack yourself.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The controller has reached its thermal-protection threshold.

What to check:

1. Stop riding and allow the scooter to cool completely in a shaded, ventilated area.
2. Check for heavy load, long hill climbs, brake drag, low tire pressure, or repeated full-throttle operation that can cause excessive heating.
3. Inspect the controller area and related connectors for abnormal heat, loose mounting, or damage.
4. After cooling, restart and test gently.

If the issue remains: If the error returns quickly during normal riding, have the controller, wiring, and related sensors/controller circuitry checked.

What it means: The brake rotor is rubbing the pads because the caliper is misaligned, the wheel is not centered, or the rotor is slightly bent.

What to check:

1. Lift the wheel and rotate it to identify whether the rubbing is continuous or only at one point.
2. Confirm the wheel/axle is seated correctly and tightened evenly.
3. Center the brake caliper around the rotor. If rubbing occurs only at one rotor position, inspect the rotor for lateral runout.
4. Check that the pads retract and that no debris is trapped between the pad and rotor.

If the issue remains: Realign the caliper or replace/true a significantly bent rotor. If you are unsure about brake adjustment, use a dealer or qualified mechanic.

What it means: Air loss can be caused by a puncture, valve leak, bead leak, damaged rim, or an incorrectly seated tire/tube.

What to check:

1. Inflate the tire to the specified pressure and use soapy water to look for bubbles around the tread, sidewall, valve, and bead.
2. Check the valve core for looseness and inspect the valve stem for damage.
3. For tubed tires, remove and patch/replace the inner tube after finding the puncture source.
4. For tubeless tires, inspect the bead and rim sealing surface and repair the puncture with an appropriate method.

If the issue remains: Replace a tire with sidewall cuts, exposed cords, severe bead damage, or repeated air loss.

What it means: The scooter is not receiving stable battery power at the display/controller, or the startup/control circuit is not completing.

What to check:

1. Fully charge the battery and confirm the charger behaves normally.
2. Check the main battery connector, power switch/key, fuse if fitted, display connector, and controller power connector.
3. Inspect for loose or overheated plugs and for water ingress.
4. If the wheel has unusually high resistance at the same time, stop testing and check the motor/controller for a shorted phase.

If the issue remains: Have the battery output, fuse/main harness, display, and controller checked in sequence.

What it means: Actual range is being reduced by battery state/age, low temperature, tire pressure, rider load, speed, hills, wind, frequent acceleration, or mechanical drag.

What to check:

1. Charge fully and compare range under similar riding conditions.
2. Set tires to the recommended pressure and check that both wheels spin freely without brake drag.
3. Test in moderate temperature using a lower riding mode and smoother acceleration.
4. If range has dropped suddenly, have battery capacity and voltage sag checked under load.

If the issue remains: A gradual reduction can be normal battery aging; a large sudden drop usually requires battery, brake-drag, motor, or controller diagnosis.

What it means: The charging path is not delivering power to the battery, or the battery/BMS is refusing charge.

What to check:

1. Verify the wall outlet and charger indicator, and confirm the charger is the correct voltage for this model.
2. Inspect the charging port and plug for looseness, contamination, bent pins, or heat damage.
3. Allow a very hot or very cold battery to return to room temperature before charging.
4. If available, test with a known-good correct-spec charger. If the charger is good, the charging port, fuse, battery wiring, or BMS requires inspection.

Safety: Stop charging immediately if the battery or charger becomes unusually hot, swollen, damaged, or produces an abnormal smell.

If the issue remains: Have the battery and charging circuit checked by the dealer. Do not bypass the BMS or charging fuse.

What it means: The noise may come from brake rub, wheel bearings, the motor, a loose fastener, or the motor/controller electrical system.

What to check:

1. Lift the drive wheel and rotate it by hand with the scooter powered off. Check for brake-disc rubbing or a rough bearing feel.
2. Check axle hardware and motor cable routing, especially where the cable exits the axle.
3. Run the wheel briefly unloaded and note whether the sound changes with speed or throttle.
4. If the wheel has strong resistance, jerks, or makes an electrical growling sound, stop testing and inspect the motor phase/Hall wiring and controller.

If the issue remains: Have the motor, bearings, brake assembly, and controller checked if the noise is pronounced or accompanied by vibration, heat, or loss of power.

What it means: The lighting circuit is not receiving power or control, or the light board/module has failed.

What to check:

1. Check whether the display shows that the lights are switched on.
2. Inspect the headlight, lighting-module, handlebar-switch, and main harness connectors.
3. Look for damaged wires around the stem/folding area and for moisture in connectors.
4. If every light is off at the same time, check the common lighting power/converter or light-control module before replacing individual lamps.

If the issue remains: Replace the failed lighting module, switch, wiring section, or lamp after the power supply is confirmed.

What it means: The turn-signal switch, lamp/module, wiring, or shared accessory power may be faulty.

What to check:

1. Check left and right signals separately and note whether only one side or both sides fail.
2. Inspect the handlebar switch connector and the front/rear turn-signal connectors.
3. Check for broken wires where the harness bends at the stem or rear frame.
4. If both sides fail, check the common turn-signal power/control module before replacing individual lights.

If the issue remains: Have the switch, wiring, and light-control module tested if the signals still do not operate.

What it means: Missing segments, icons, or partial display output usually indicates a display-panel fault, unstable power supply, or communication issue.

What to check:

1. Restart the scooter and observe whether the display is incomplete from the first startup screen.
2. Check the display connector and main communication cable for loose pins or moisture.
3. If the scooter functions normally but the same LCD/LED segments remain missing, the display module is likely defective.
4. If the display changes together with communication errors, test the controller/display communication line.

If the issue remains: Replace the display if the panel itself is defective; otherwise repair the wiring or controller communication fault.

What it means: The rear light is not receiving power/control or the rear lamp/wiring has failed.

What to check:

1. Check whether the brake light and normal tail-light functions both fail or only one function is affected.
2. Inspect the rear-light connector and wiring where it passes through the rear fender/frame.
3. Check the brake lever cut-off signal if the brake-light function alone is affected.
4. Confirm the accessory-lighting power supply is present.

If the issue remains: Replace the rear lamp, damaged harness, or lighting-control component after the circuit is checked.

What it means: The throttle signal is outside its expected range or the throttle is not at the neutral position.

What to check:

1. Power the scooter off and make sure the throttle returns fully to its rest position without rubbing the grip or switch housing.
2. Restart without touching the throttle.
3. Inspect the throttle connector and cable for looseness, damage, water ingress, or a detached magnetic/sensor component.
4. If the fault returns, test or replace the throttle assembly.

Safety: Do not ride if the throttle sticks or the scooter accelerates without a deliberate throttle command.

If the issue remains: If a new throttle does not clear the fault, have the controller input and wiring harness checked.

What it means: Free-spin speed and real riding speed are not expected to be identical because rider load, battery voltage, tire pressure, road gradient, temperature, and controller limits all affect speed.

What to check:

1. Verify tire pressure, battery charge, riding mode, and any speed-limit setting.
2. Compare speed using the same battery state and flat-road conditions.
3. Confirm the display wheel-size/speed parameters have not been changed.
4. If speed is dramatically below specification together with weak acceleration, check battery voltage sag, brake drag, motor, and controller.

If the issue remains: A small difference is normal; a large or sudden loss of speed should be diagnosed as a battery, motor, controller, or mechanical-drag issue.

What it means: Free-spin speed and real riding speed are not expected to be identical because rider load, battery voltage, tire pressure, road gradient, temperature, and controller limits all affect speed.

What to check:

1. Verify tire pressure, battery charge, riding mode, and any speed-limit setting.
2. Compare speed using the same battery state and flat-road conditions.
3. Confirm the display wheel-size/speed parameters have not been changed.
4. If speed is dramatically below specification together with weak acceleration, check battery voltage sag, brake drag, motor, and controller.

If the issue remains: A small difference is normal; a large or sudden loss of speed should be diagnosed as a battery, motor, controller, or mechanical-drag issue.

What it means: The noise may come from brake rub, wheel bearings, the motor, a loose fastener, or the motor/controller electrical system.

What to check:

1. Lift the drive wheel and rotate it by hand with the scooter powered off. Check for brake-disc rubbing or a rough bearing feel.
2. Check axle hardware and motor cable routing, especially where the cable exits the axle.
3. Run the wheel briefly unloaded and note whether the sound changes with speed or throttle.
4. If the wheel has strong resistance, jerks, or makes an electrical growling sound, stop testing and inspect the motor phase/Hall wiring and controller.

If the issue remains: Have the motor, bearings, brake assembly, and controller checked if the noise is pronounced or accompanied by vibration, heat, or loss of power.

What it means: The motor may spin with little load but cannot produce enough torque when the scooter is carrying weight. Possible causes include a motor phase/Hall issue, controller current limitation, battery voltage sag, or mechanical drag.

What to check:

1. Check tire pressure and make sure the brakes and wheel bearings are not dragging.
2. Fully charge the battery and observe whether the voltage drops sharply when acceleration is applied.
3. Inspect the motor phase/Hall connectors and the motor cable near the axle.
4. If the motor jerks, growls, or has poor torque, test the motor and controller together.

If the issue remains: Have the battery under-load voltage, controller output, and motor phase/Hall signals tested by the dealer.

What it means: The stem/folding assembly or steering bearing has free play.

What to check:

1. With the scooter powered off, hold the front brake and gently rock the scooter to locate the source of the play.
2. Check the folding latch, stem fixing bolts, handlebar clamp, and headset/bearing adjustment.
3. Tighten only to the specified torque; overtightening the steering bearings can make steering stiff.
4. If the fixing hardware is tight but play remains, inspect the bearing cup/headset and folding components for wear.

Safety: Do not ride if the stem or folding mechanism has significant movement.

If the issue remains: Replace worn bearings or folding/stem parts if tightening does not remove the play.

What it means: A structural or load-bearing component has physically failed.

What to check:

1. Stop riding immediately and do not attempt a temporary high-speed repair.
2. Photograph the damaged part and surrounding area to check whether other components were also stressed.
3. Replace the broken component with the correct original-spec part and new required fasteners.
4. After replacement, verify wheel alignment, axle security, folding/stem alignment, and brake operation as applicable.

Safety: Structural cracks, broken axle/motor-hub parts, and broken frame/folding fasteners are safety-critical.

If the issue remains: Have the repair inspected by a qualified technician before returning the scooter to normal riding.

What it means: The scooter is detecting an abnormal battery-voltage condition even though the battery appears fully charged.

What to check:

1. Confirm the charger is the correct voltage and stop using any charger with a higher output rating than specified.
2. Power-cycle the scooter after disconnecting the charger.
3. Inspect the battery/main connector and charging connector.
4. Have the actual pack voltage compared with the display voltage; a mismatch can indicate a display, controller, wiring, BMS, or battery fault.

Safety: Do not open the battery pack or bypass the BMS.

If the issue remains: If E5 returns, have the battery/BMS and voltage-sensing circuit tested. Do not continue charging an actually over-voltage battery.

What it means: The charger may have no AC input, may be in protection mode, may not be connected to the battery, or may be faulty.

What to check:

1. Confirm the wall outlet works and the charger's AC cable is fully connected.
2. Inspect the charging plug and scooter charging port for bent pins, debris, heat marks, or looseness.
3. Try the normal charging sequence recommended for the scooter and observe whether the charger changes from standby to charging.
4. If the light flashes, allow the charger to cool and retry in a normal-temperature environment.

If the issue remains: If the charger output is absent or the indicator remains abnormal with a known-good outlet and connection, replace the charger with the correct original-spec unit.

What it means: The controller detects that the motor cannot rotate normally or that a phase/motor condition is preventing rotation.

What to check:

1. Power off the scooter and check whether the wheel can rotate by hand.
2. Make sure the brake is not locked and the tire/fender is not physically jammed.
3. Inspect the motor phase/Hall connector and cable near the axle.
4. If the wheel has strong magnetic resistance or jerks, the motor phases or controller MOSFET stage may be faulty.

If the issue remains: Stop riding and have the motor/controller diagnosed if the stall error returns.

What it means: The battery/controller is detecting voltage above the normal operating limit.

What to check:

1. Stop charging and confirm the charger voltage rating matches the scooter battery.
2. Restart only after disconnecting the charger.
3. Have the actual battery voltage safely verified.
4. Check whether regenerative braking immediately after a full charge is causing the voltage to rise.

Safety: Do not use a charger with a higher voltage than the original specification.

If the issue remains: If the actual pack voltage is too high, stop using the scooter and have the charger, battery, and BMS inspected.

What it means: Battery voltage has fallen below the controller's safe operating threshold.

What to check:

1. Fully charge the battery with the correct charger and verify that the charger completes its normal cycle.
2. Inspect the battery/main connector and charging connector for poor contact or heat damage.
3. If the fault occurs mainly during acceleration or hills, the battery may be sagging under load.
4. Check the displayed voltage before and during load; a sudden large drop suggests battery, BMS, or high-resistance connection problems.

If the issue remains: Have the battery capacity, BMS, main connector, and controller input tested. Do not bypass low-voltage protection.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The throttle signal is outside its expected range or the throttle is not at the neutral position.

What to check:

1. Power the scooter off and make sure the throttle returns fully to its rest position without rubbing the grip or switch housing.
2. Restart without touching the throttle.
3. Inspect the throttle connector and cable for looseness, damage, water ingress, or a detached magnetic/sensor component.
4. If the fault returns, test or replace the throttle assembly.

Safety: Do not ride if the throttle sticks or the scooter accelerates without a deliberate throttle command.

If the issue remains: If a new throttle does not clear the fault, have the controller input and wiring harness checked.

What it means: The brake cut-off/lever signal is abnormal or the brake lever is not returning to its normal position.

What to check:

1. Release both brake levers fully and confirm they return smoothly.
2. Check the brake cut-off sensor/lever connector and cable for damage or a loose plug.
3. Power-cycle the scooter without holding either brake.
4. If the display still shows a brake fault, test the brake lever/sensor and related wiring.

Safety: Brake faults are safety-critical; do not ride until both mechanical braking and electrical cut-off behavior are normal.

If the issue remains: Replace the faulty brake lever/cut-off sensor or repair the wiring. Confirm normal braking before riding.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The controller is not receiving a valid motor Hall/phase signal, or the motor/controller circuit has a fault.

What to check:

1. Power off the scooter and inspect the motor cable, especially where it exits the axle.
2. Reseat the motor phase/Hall connectors and check for bent pins, moisture, or heat damage.
3. Lift the wheel and rotate it by hand; strong resistance, jerking, or grinding can indicate a phase/controller problem.
4. If the wiring is intact, test the motor Hall signals and controller with known-good parts.

If the issue remains: Do not continue riding with a motor/Hall fault. Have the motor and controller diagnosed together.

What it means: The controller is not receiving a valid motor Hall/phase signal, or the motor/controller circuit has a fault.

What to check:

1. Power off the scooter and inspect the motor cable, especially where it exits the axle.
2. Reseat the motor phase/Hall connectors and check for bent pins, moisture, or heat damage.
3. Lift the wheel and rotate it by hand; strong resistance, jerking, or grinding can indicate a phase/controller problem.
4. If the wiring is intact, test the motor Hall signals and controller with known-good parts.

If the issue remains: Do not continue riding with a motor/Hall fault. Have the motor and controller diagnosed together.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The controller is not receiving a valid motor Hall/phase signal, or the motor/controller circuit has a fault.

What to check:

1. Power off the scooter and inspect the motor cable, especially where it exits the axle.
2. Reseat the motor phase/Hall connectors and check for bent pins, moisture, or heat damage.
3. Lift the wheel and rotate it by hand; strong resistance, jerking, or grinding can indicate a phase/controller problem.
4. If the wiring is intact, test the motor Hall signals and controller with known-good parts.

If the issue remains: Do not continue riding with a motor/Hall fault. Have the motor and controller diagnosed together.

What it means: The throttle signal is outside its expected range or the throttle is not at the neutral position.

What to check:

1. Power the scooter off and make sure the throttle returns fully to its rest position without rubbing the grip or switch housing.
2. Restart without touching the throttle.
3. Inspect the throttle connector and cable for looseness, damage, water ingress, or a detached magnetic/sensor component.
4. If the fault returns, test or replace the throttle assembly.

Safety: Do not ride if the throttle sticks or the scooter accelerates without a deliberate throttle command.

If the issue remains: If a new throttle does not clear the fault, have the controller input and wiring harness checked.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: Battery voltage has fallen below the controller's safe operating threshold.

What to check:

1. Fully charge the battery with the correct charger and verify that the charger completes its normal cycle.
2. Inspect the battery/main connector and charging connector for poor contact or heat damage.
3. If the fault occurs mainly during acceleration or hills, the battery may be sagging under load.
4. Check the displayed voltage before and during load; a sudden large drop suggests battery, BMS, or high-resistance connection problems.

If the issue remains: Have the battery capacity, BMS, main connector, and controller input tested. Do not bypass low-voltage protection.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The controller has reached its thermal-protection threshold.

What to check:

1. Stop riding and allow the scooter to cool completely in a shaded, ventilated area.
2. Check for heavy load, long hill climbs, brake drag, low tire pressure, or repeated full-throttle operation that can cause excessive heating.
3. Inspect the controller area and related connectors for abnormal heat, loose mounting, or damage.
4. After cooling, restart and test gently.

If the issue remains: If the error returns quickly during normal riding, have the controller, wiring, and related sensors/controller circuitry checked.

What it means: Battery voltage has fallen below the controller's safe operating threshold.

What to check:

1. Fully charge the battery with the correct charger and verify that the charger completes its normal cycle.
2. Inspect the battery/main connector and charging connector for poor contact or heat damage.
3. If the fault occurs mainly during acceleration or hills, the battery may be sagging under load.
4. Check the displayed voltage before and during load; a sudden large drop suggests battery, BMS, or high-resistance connection problems.

If the issue remains: Have the battery capacity, BMS, main connector, and controller input tested. Do not bypass low-voltage protection.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The controller has reached its thermal-protection threshold.

What to check:

1. Stop riding and allow the scooter to cool completely in a shaded, ventilated area.
2. Check for heavy load, long hill climbs, brake drag, low tire pressure, or repeated full-throttle operation that can cause excessive heating.
3. Inspect the controller area and related connectors for abnormal heat, loose mounting, or damage.
4. After cooling, restart and test gently.

If the issue remains: If the error returns quickly during normal riding, have the controller, wiring, and related sensors/controller circuitry checked.

What it means: The horn/speaker command may be stuck because of a switch, wiring, moisture, or control-module fault.

What to check:

1. Turn the scooter off and check whether the horn button is physically stuck or being pressed by the switch housing.
2. Inspect the horn-button cable and handlebar wiring for pinching or water ingress.
3. Disconnect and reconnect the relevant handlebar/display plug with the power off.
4. If the horn starts sounding immediately after power-on, the switch module or control signal should be tested.

If the issue remains: Replace the faulty switch, wiring harness, or horn/control module as required. Do not continue riding if the horn cannot be controlled.

What it means: The displayed voltage is higher than the expected fully charged voltage, which can be caused by an incorrect display setting, wrong charger, display error, or actual overvoltage.

What to check:

1. Stop charging and confirm that the charger voltage rating matches the original battery specification.
2. Check the scooter/display voltage setting if the display supports configurable battery voltage.
3. Have the battery voltage measured safely with a suitable meter by a qualified person.
4. If the real battery voltage is normal but the display reads high, inspect the display and communication/controller signal.

Safety: Never probe a lithium battery connector in a way that could short the terminals.

If the issue remains: Do not ride or charge the scooter if the actual battery voltage is above the battery's specified maximum. Contact the dealer for battery/BMS inspection.

What it means: The noise may come from brake rub, wheel bearings, the motor, a loose fastener, or the motor/controller electrical system.

What to check:

1. Lift the drive wheel and rotate it by hand with the scooter powered off. Check for brake-disc rubbing or a rough bearing feel.
2. Check axle hardware and motor cable routing, especially where the cable exits the axle.
3. Run the wheel briefly unloaded and note whether the sound changes with speed or throttle.
4. If the wheel has strong resistance, jerks, or makes an electrical growling sound, stop testing and inspect the motor phase/Hall wiring and controller.

If the issue remains: Have the motor, bearings, brake assembly, and controller checked if the noise is pronounced or accompanied by vibration, heat, or loss of power.

What it means: The battery gauge and the measured pack voltage are not matching, or the scooter is reporting a battery-voltage fault.

What to check:

1. Turn the scooter off, charge the battery fully with the correct original-spec charger, then power it on again.
2. Check the battery connector and charging connector for looseness, bent pins, heat marks, oxidation, or moisture.
3. Compare the display voltage with a safe battery measurement made by a qualified person. A large difference can indicate a display, wiring, BMS, or battery problem.
4. If the voltage drops sharply as soon as the throttle is applied, stop riding and have the battery checked under load.

Safety: Stop using the scooter if the battery is swollen, unusually hot, damaged, smells abnormal, or shows signs of water ingress.

If the issue remains: Have the battery, BMS, main wiring, and display/controller voltage signal checked by the dealer. Do not open or repair the lithium battery pack yourself.

What it means: The shared accessory power, handlebar switch, converter, or wiring may not be supplying the headlight/horn circuit.

What to check:

1. Check whether other low-voltage accessories work normally.
2. Inspect the headlight/horn connectors and the handlebar switch connector for looseness or water ingress.
3. Check the accessory DC converter/module and its input/output connection.
4. If both headlight and horn fail together, prioritize the common power/ground and converter circuit.

If the issue remains: Have the accessory power module, switch assembly, and wiring harness tested by the dealer.

What it means: Missing segments, icons, or partial display output usually indicates a display-panel fault, unstable power supply, or communication issue.

What to check:

1. Restart the scooter and observe whether the display is incomplete from the first startup screen.
2. Check the display connector and main communication cable for loose pins or moisture.
3. If the scooter functions normally but the same LCD/LED segments remain missing, the display module is likely defective.
4. If the display changes together with communication errors, test the controller/display communication line.

If the issue remains: Replace the display if the panel itself is defective; otherwise repair the wiring or controller communication fault.

What it means: The noise may come from brake rub, wheel bearings, the motor, a loose fastener, or the motor/controller electrical system.

What to check:

1. Lift the drive wheel and rotate it by hand with the scooter powered off. Check for brake-disc rubbing or a rough bearing feel.
2. Check axle hardware and motor cable routing, especially where the cable exits the axle.
3. Run the wheel briefly unloaded and note whether the sound changes with speed or throttle.
4. If the wheel has strong resistance, jerks, or makes an electrical growling sound, stop testing and inspect the motor phase/Hall wiring and controller.

If the issue remains: Have the motor, bearings, brake assembly, and controller checked if the noise is pronounced or accompanied by vibration, heat, or loss of power.

What it means: The scooter is not receiving stable battery power at the display/controller, or the startup/control circuit is not completing.

What to check:

1. Fully charge the battery and confirm the charger behaves normally.
2. Check the main battery connector, power switch/key, fuse if fitted, display connector, and controller power connector.
3. Inspect for loose or overheated plugs and for water ingress.
4. If the wheel has unusually high resistance at the same time, stop testing and check the motor/controller for a shorted phase.

If the issue remains: Have the battery output, fuse/main harness, display, and controller checked in sequence.

What it means: The steering bearing/headset, stem hardware, or cable routing may be dry, worn, overtightened, or damaged.

What to check:

1. Lift or unload the front end and turn the handlebar slowly from side to side.
2. Check whether cables are pulling tightly or rubbing as the handlebar turns.
3. Check the headset/bearing area for play, rough spots, clicking, or excessive preload.
4. Inspect the bearing cup and stem fasteners; if the bearings feel notchy or worn, replace the bearing set.

If the issue remains: Have the steering bearings and stem/folding assembly serviced before riding if steering is stiff, notchy, or has free play.

What it means: The charging path is not delivering power to the battery, or the battery/BMS is refusing charge.

What to check:

1. Verify the wall outlet and charger indicator, and confirm the charger is the correct voltage for this model.
2. Inspect the charging port and plug for looseness, contamination, bent pins, or heat damage.
3. Allow a very hot or very cold battery to return to room temperature before charging.
4. If available, test with a known-good correct-spec charger. If the charger is good, the charging port, fuse, battery wiring, or BMS requires inspection.

Safety: Stop charging immediately if the battery or charger becomes unusually hot, swollen, damaged, or produces an abnormal smell.

If the issue remains: Have the battery and charging circuit checked by the dealer. Do not bypass the BMS or charging fuse.

What it means: The drive-mode command is not switching the front/rear controller configuration.

What to check:

1. Confirm the scooter is stationary and use the correct single/dual-drive button sequence for the model.
2. Check whether both motors can operate individually and whether any controller or motor error code is present.
3. Inspect the display/switch connection and the front/rear controller communication wiring.
4. If one motor does not respond at all, diagnose that motor/controller first.

If the issue remains: Have the mode switch/display and both controller communication circuits tested.

What it means: The scooter powers on but the drive system is not accepting or delivering a valid throttle command.

What to check:

1. Check for any error code, lock icon, brake icon, kick-start/zero-start setting, or parking mode.
2. Release both brake levers and confirm the throttle returns to neutral.
3. Check the throttle, brake cut-off, motor, and controller connectors.
4. If the motor only jerks or makes noise, inspect the motor Hall/phase circuit and controller.

If the issue remains: Have the throttle, brake cut-off circuit, motor, and controller tested if the scooter still will not drive.

What it means: The throttle is not mechanically returning to its neutral position or the throttle sensor signal is sticking.

What to check:

1. Turn the scooter off and check that the throttle moves freely and springs back immediately when released.
2. Make sure the grip, brake lever, or switch housing is not rubbing against the throttle.
3. Inspect the throttle cable and connector for pinching, damage, or water ingress.
4. Do not lubricate the electronic sensor internally unless the manufacturer specifically instructs it.

Safety: A throttle that does not return to neutral is a safety-critical fault.

If the issue remains: Replace the throttle assembly if it does not return reliably. Do not ride with a sticking throttle.

What it means: The small indicator usually appears when a display function or status mode has been activated.

What to check:

1. Restart the scooter and check whether the icon clears.
2. Review the display's riding-mode, cruise, lock, Bluetooth/NFC, and settings status.
3. If the scooter otherwise operates normally, the icon is usually a status indication rather than a motor fault.
4. If it appears together with abnormal riding behavior, photograph the display and send it to your dealer for identification.

If the issue remains: Use the model-specific display manual or dealer support to identify the exact indicator for your display version.

What it means: The scooter is in an electronic lock, password, NFC, or anti-theft state.

What to check:

1. Use the normal unlock method for your model: display password, NFC card, or app unlock if supported.
2. Power the scooter off and on, then retry the unlock procedure.
3. Confirm that the NFC card/app account belongs to this scooter and that the display has not been replaced with an unpaired unit.
4. If the lock remains, do not repeatedly enter random codes.

If the issue remains: Contact the dealer with proof of ownership so they can provide the correct reset or pairing procedure for the installed display.

What it means: The display touch panel is not detecting input, or the display has a power/software/connection problem.

What to check:

1. Dry and clean the display surface and remove gloves, water, dirt, or a screen film that may interfere with touch input.
2. Power-cycle the scooter and wait for the display to finish starting before touching the controls.
3. Check the display connector and main communication cable.
4. If only one touch area fails consistently, the touch panel itself may be damaged.

If the issue remains: Replace or service the display if the touch panel remains unresponsive after the wiring and power supply are confirmed.

What it means: Suspension noise can come from loose mounting hardware, dry bushings, internal shock wear, or contact between surrounding parts.

What to check:

1. With the scooter powered off, compress the suspension slowly and identify whether the noise comes from the shock or its mounting points.
2. Check shock mounting bolts, bushings, and nearby fender/body parts for looseness or contact.
3. Inspect for oil leakage, bent parts, or excessive side play.
4. If the noise is internal, avoid disassembling a sealed damper unless you have the correct service procedure.

If the issue remains: Service or replace the shock/bushings if the noise persists or if damping feels weak or inconsistent.

What it means: The noise may come from brake rub, wheel bearings, the motor, a loose fastener, or the motor/controller electrical system.

What to check:

1. Lift the drive wheel and rotate it by hand with the scooter powered off. Check for brake-disc rubbing or a rough bearing feel.
2. Check axle hardware and motor cable routing, especially where the cable exits the axle.
3. Run the wheel briefly unloaded and note whether the sound changes with speed or throttle.
4. If the wheel has strong resistance, jerks, or makes an electrical growling sound, stop testing and inspect the motor phase/Hall wiring and controller.

If the issue remains: Have the motor, bearings, brake assembly, and controller checked if the noise is pronounced or accompanied by vibration, heat, or loss of power.

What it means: The display is not receiving a valid speed signal from the motor/controller.

What to check:

1. Check whether the scooter drives normally and whether an error code is also shown.
2. Inspect the motor Hall/phase connector, controller connector, and display communication cable.
3. Check the cable near the motor axle and folding/stem area for damage or a loose plug.
4. If speed appears only in one wheel direction, the motor Hall/speed signal or controller interpretation should be tested.

If the issue remains: Have the motor Hall signal, controller, and display communication line tested with diagnostic equipment.

What it means: The steering bearing/headset, stem hardware, or cable routing may be dry, worn, overtightened, or damaged.

What to check:

1. Lift or unload the front end and turn the handlebar slowly from side to side.
2. Check whether cables are pulling tightly or rubbing as the handlebar turns.
3. Check the headset/bearing area for play, rough spots, clicking, or excessive preload.
4. Inspect the bearing cup and stem fasteners; if the bearings feel notchy or worn, replace the bearing set.

If the issue remains: Have the steering bearings and stem/folding assembly serviced before riding if steering is stiff, notchy, or has free play.

What it means: The battery gauge and the measured pack voltage are not matching, or the scooter is reporting a battery-voltage fault.

What to check:

1. Turn the scooter off, charge the battery fully with the correct original-spec charger, then power it on again.
2. Check the battery connector and charging connector for looseness, bent pins, heat marks, oxidation, or moisture.
3. Compare the display voltage with a safe battery measurement made by a qualified person. A large difference can indicate a display, wiring, BMS, or battery problem.
4. If the voltage drops sharply as soon as the throttle is applied, stop riding and have the battery checked under load.

Safety: Stop using the scooter if the battery is swollen, unusually hot, damaged, smells abnormal, or shows signs of water ingress.

If the issue remains: Have the battery, BMS, main wiring, and display/controller voltage signal checked by the dealer. Do not open or repair the lithium battery pack yourself.

What it means: The controller is not receiving a valid motor Hall/phase signal, or the motor/controller circuit has a fault.

What to check:

1. Power off the scooter and inspect the motor cable, especially where it exits the axle.
2. Reseat the motor phase/Hall connectors and check for bent pins, moisture, or heat damage.
3. Lift the wheel and rotate it by hand; strong resistance, jerking, or grinding can indicate a phase/controller problem.
4. If the wiring is intact, test the motor Hall signals and controller with known-good parts.

If the issue remains: Do not continue riding with a motor/Hall fault. Have the motor and controller diagnosed together.

What it means: The throttle signal is outside its expected range or the throttle is not at the neutral position.

What to check:

1. Power the scooter off and make sure the throttle returns fully to its rest position without rubbing the grip or switch housing.
2. Restart without touching the throttle.
3. Inspect the throttle connector and cable for looseness, damage, water ingress, or a detached magnetic/sensor component.
4. If the fault returns, test or replace the throttle assembly.

Safety: Do not ride if the throttle sticks or the scooter accelerates without a deliberate throttle command.

If the issue remains: If a new throttle does not clear the fault, have the controller input and wiring harness checked.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The scooter is reporting an abnormal battery, charging, or voltage condition.

What to check:

1. Charge the battery with the correct original-spec charger and observe the charger indicator.
2. Inspect the charging port, battery connector, and main wiring for looseness, heat, or moisture.
3. Check whether the error appears only under acceleration, which can indicate voltage sag.
4. If possible, have the battery voltage and capacity tested by the dealer.

If the issue remains: Service or replace the battery/BMS, charger, or damaged wiring after diagnosis. Do not open the lithium battery pack yourself.

What it means: The hydraulic brake is not generating enough braking force, or the lever/caliper system contains air, a leak, or worn components.

What to check:

1. Do not ride until braking is restored. Check the lever, hose, caliper, rotor, and pads for visible leaks or damage.
2. Check pad thickness and make sure the rotor and pads are not contaminated with oil or grease.
3. If the lever pulls to the handlebar or feels spongy, the hydraulic system may require bleeding.
4. Check that the caliper is correctly aligned with the disc.

Safety: Brakes are safety-critical; do not test at riding speed until correct braking force is confirmed.

If the issue remains: Have the brake bled, pads replaced, leak repaired, or lever/caliper serviced by a qualified technician.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The controller is not receiving a valid motor Hall/phase signal, or the motor/controller circuit has a fault.

What to check:

1. Power off the scooter and inspect the motor cable, especially where it exits the axle.
2. Reseat the motor phase/Hall connectors and check for bent pins, moisture, or heat damage.
3. Lift the wheel and rotate it by hand; strong resistance, jerking, or grinding can indicate a phase/controller problem.
4. If the wiring is intact, test the motor Hall signals and controller with known-good parts.

If the issue remains: Do not continue riding with a motor/Hall fault. Have the motor and controller diagnosed together.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The scooter is reporting an abnormal battery, charging, or voltage condition.

What to check:

1. Charge the battery with the correct original-spec charger and observe the charger indicator.
2. Inspect the charging port, battery connector, and main wiring for looseness, heat, or moisture.
3. Check whether the error appears only under acceleration, which can indicate voltage sag.
4. If possible, have the battery voltage and capacity tested by the dealer.

If the issue remains: Service or replace the battery/BMS, charger, or damaged wiring after diagnosis. Do not open the lithium battery pack yourself.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: Visible oil around the shock absorber indicates a seal or damper leak rather than normal surface moisture.

What to check:

1. Wipe the shock clean, compress it several times, and check whether fresh oil reappears around the seal.
2. Inspect the shock body and shaft for scratches, dents, or impact damage.
3. Check the mounting bolts for looseness, but do not overtighten the suspension hardware.
4. If oil continues to appear, the shock seal/damper requires service or replacement.

If the issue remains: Replace or professionally service the leaking shock absorber. Continued use can reduce damping and handling stability.

What it means: The lighting circuit is not receiving power or control, or the light board/module has failed.

What to check:

1. Check whether the display shows that the lights are switched on.
2. Inspect the headlight, lighting-module, handlebar-switch, and main harness connectors.
3. Look for damaged wires around the stem/folding area and for moisture in connectors.
4. If every light is off at the same time, check the common lighting power/converter or light-control module before replacing individual lamps.

If the issue remains: Replace the failed lighting module, switch, wiring section, or lamp after the power supply is confirmed.

What it means: The controller detects that the motor cannot rotate normally or that a phase/motor condition is preventing rotation.

What to check:

1. Power off the scooter and check whether the wheel can rotate by hand.
2. Make sure the brake is not locked and the tire/fender is not physically jammed.
3. Inspect the motor phase/Hall connector and cable near the axle.
4. If the wheel has strong magnetic resistance or jerks, the motor phases or controller MOSFET stage may be faulty.

If the issue remains: Stop riding and have the motor/controller diagnosed if the stall error returns.

What it means: The battery/controller is detecting voltage above the normal operating limit.

What to check:

1. Stop charging and confirm the charger voltage rating matches the scooter battery.
2. Restart only after disconnecting the charger.
3. Have the actual battery voltage safely verified.
4. Check whether regenerative braking immediately after a full charge is causing the voltage to rise.

Safety: Do not use a charger with a higher voltage than the original specification.

If the issue remains: If the actual pack voltage is too high, stop using the scooter and have the charger, battery, and BMS inspected.

What it means: Battery voltage has fallen below the controller's safe operating threshold.

What to check:

1. Fully charge the battery with the correct charger and verify that the charger completes its normal cycle.
2. Inspect the battery/main connector and charging connector for poor contact or heat damage.
3. If the fault occurs mainly during acceleration or hills, the battery may be sagging under load.
4. Check the displayed voltage before and during load; a sudden large drop suggests battery, BMS, or high-resistance connection problems.

If the issue remains: Have the battery capacity, BMS, main connector, and controller input tested. Do not bypass low-voltage protection.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The brake cut-off/lever signal is abnormal or the brake lever is not returning to its normal position.

What to check:

1. Release both brake levers fully and confirm they return smoothly.
2. Check the brake cut-off sensor/lever connector and cable for damage or a loose plug.
3. Power-cycle the scooter without holding either brake.
4. If the display still shows a brake fault, test the brake lever/sensor and related wiring.

Safety: Brake faults are safety-critical; do not ride until both mechanical braking and electrical cut-off behavior are normal.

If the issue remains: Replace the faulty brake lever/cut-off sensor or repair the wiring. Confirm normal braking before riding.

What it means: The throttle signal is outside its expected range or the throttle is not at the neutral position.

What to check:

1. Power the scooter off and make sure the throttle returns fully to its rest position without rubbing the grip or switch housing.
2. Restart without touching the throttle.
3. Inspect the throttle connector and cable for looseness, damage, water ingress, or a detached magnetic/sensor component.
4. If the fault returns, test or replace the throttle assembly.

Safety: Do not ride if the throttle sticks or the scooter accelerates without a deliberate throttle command.

If the issue remains: If a new throttle does not clear the fault, have the controller input and wiring harness checked.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The controller is not receiving a valid motor Hall/phase signal, or the motor/controller circuit has a fault.

What to check:

1. Power off the scooter and inspect the motor cable, especially where it exits the axle.
2. Reseat the motor phase/Hall connectors and check for bent pins, moisture, or heat damage.
3. Lift the wheel and rotate it by hand; strong resistance, jerking, or grinding can indicate a phase/controller problem.
4. If the wiring is intact, test the motor Hall signals and controller with known-good parts.

If the issue remains: Do not continue riding with a motor/Hall fault. Have the motor and controller diagnosed together.

What it means: The scooter powers on but the drive system is not accepting or delivering a valid throttle command.

What to check:

1. Check for any error code, lock icon, brake icon, kick-start/zero-start setting, or parking mode.
2. Release both brake levers and confirm the throttle returns to neutral.
3. Check the throttle, brake cut-off, motor, and controller connectors.
4. If the motor only jerks or makes noise, inspect the motor Hall/phase circuit and controller.

If the issue remains: Have the throttle, brake cut-off circuit, motor, and controller tested if the scooter still will not drive.

What it means: The throttle is not mechanically returning to its neutral position or the throttle sensor signal is sticking.

What to check:

1. Turn the scooter off and check that the throttle moves freely and springs back immediately when released.
2. Make sure the grip, brake lever, or switch housing is not rubbing against the throttle.
3. Inspect the throttle cable and connector for pinching, damage, or water ingress.
4. Do not lubricate the electronic sensor internally unless the manufacturer specifically instructs it.

Safety: A throttle that does not return to neutral is a safety-critical fault.

If the issue remains: Replace the throttle assembly if it does not return reliably. Do not ride with a sticking throttle.

What it means: The small indicator usually appears when a display function or status mode has been activated.

What to check:

1. Restart the scooter and check whether the icon clears.
2. Review the display's riding-mode, cruise, lock, Bluetooth/NFC, and settings status.
3. If the scooter otherwise operates normally, the icon is usually a status indication rather than a motor fault.
4. If it appears together with abnormal riding behavior, photograph the display and send it to your dealer for identification.

If the issue remains: Use the model-specific display manual or dealer support to identify the exact indicator for your display version.

What it means: The scooter is in an electronic lock, password, NFC, or anti-theft state.

What to check:

1. Use the normal unlock method for your model: display password, NFC card, or app unlock if supported.
2. Power the scooter off and on, then retry the unlock procedure.
3. Confirm that the NFC card/app account belongs to this scooter and that the display has not been replaced with an unpaired unit.
4. If the lock remains, do not repeatedly enter random codes.

If the issue remains: Contact the dealer with proof of ownership so they can provide the correct reset or pairing procedure for the installed display.

What it means: The scooter is not receiving stable battery power at the display/controller, or the startup/control circuit is not completing.

What to check:

1. Fully charge the battery and confirm the charger behaves normally.
2. Check the main battery connector, power switch/key, fuse if fitted, display connector, and controller power connector.
3. Inspect for loose or overheated plugs and for water ingress.
4. If the wheel has unusually high resistance at the same time, stop testing and check the motor/controller for a shorted phase.

If the issue remains: Have the battery output, fuse/main harness, display, and controller checked in sequence.

What it means: The display touch panel is not detecting input, or the display has a power/software/connection problem.

What to check:

1. Dry and clean the display surface and remove gloves, water, dirt, or a screen film that may interfere with touch input.
2. Power-cycle the scooter and wait for the display to finish starting before touching the controls.
3. Check the display connector and main communication cable.
4. If only one touch area fails consistently, the touch panel itself may be damaged.

If the issue remains: Replace or service the display if the touch panel remains unresponsive after the wiring and power supply are confirmed.

What it means: Suspension noise can come from loose mounting hardware, dry bushings, internal shock wear, or contact between surrounding parts.

What to check:

1. With the scooter powered off, compress the suspension slowly and identify whether the noise comes from the shock or its mounting points.
2. Check shock mounting bolts, bushings, and nearby fender/body parts for looseness or contact.
3. Inspect for oil leakage, bent parts, or excessive side play.
4. If the noise is internal, avoid disassembling a sealed damper unless you have the correct service procedure.

If the issue remains: Service or replace the shock/bushings if the noise persists or if damping feels weak or inconsistent.

What it means: The noise may come from brake rub, wheel bearings, the motor, a loose fastener, or the motor/controller electrical system.

What to check:

1. Lift the drive wheel and rotate it by hand with the scooter powered off. Check for brake-disc rubbing or a rough bearing feel.
2. Check axle hardware and motor cable routing, especially where the cable exits the axle.
3. Run the wheel briefly unloaded and note whether the sound changes with speed or throttle.
4. If the wheel has strong resistance, jerks, or makes an electrical growling sound, stop testing and inspect the motor phase/Hall wiring and controller.

If the issue remains: Have the motor, bearings, brake assembly, and controller checked if the noise is pronounced or accompanied by vibration, heat, or loss of power.

What it means: The steering bearing/headset, stem hardware, or cable routing may be dry, worn, overtightened, or damaged.

What to check:

1. Lift or unload the front end and turn the handlebar slowly from side to side.
2. Check whether cables are pulling tightly or rubbing as the handlebar turns.
3. Check the headset/bearing area for play, rough spots, clicking, or excessive preload.
4. Inspect the bearing cup and stem fasteners; if the bearings feel notchy or worn, replace the bearing set.

If the issue remains: Have the steering bearings and stem/folding assembly serviced before riding if steering is stiff, notchy, or has free play.

What it means: The behavior is consistent with cruise-control or automatic speed-hold logic being enabled, or with an abnormal throttle signal.

What to check:

1. Check the display settings for cruise control / automatic cruise and disable it if you do not want speed hold.
2. Restart the scooter and confirm the throttle returns smoothly to zero.
3. Test at low speed in a safe area to see whether the behavior occurs only after holding a steady throttle for several seconds.
4. If speed changes without a stable-throttle period, inspect the throttle and its connector.

If the issue remains: If the scooter accelerates or decelerates unexpectedly with cruise disabled, stop riding and have the throttle/controller checked.

What it means: The battery gauge and the measured pack voltage are not matching, or the scooter is reporting a battery-voltage fault.

What to check:

1. Turn the scooter off, charge the battery fully with the correct original-spec charger, then power it on again.
2. Check the battery connector and charging connector for looseness, bent pins, heat marks, oxidation, or moisture.
3. Compare the display voltage with a safe battery measurement made by a qualified person. A large difference can indicate a display, wiring, BMS, or battery problem.
4. If the voltage drops sharply as soon as the throttle is applied, stop riding and have the battery checked under load.

Safety: Stop using the scooter if the battery is swollen, unusually hot, damaged, smells abnormal, or shows signs of water ingress.

If the issue remains: Have the battery, BMS, main wiring, and display/controller voltage signal checked by the dealer. Do not open or repair the lithium battery pack yourself.

What it means: The controller is not receiving a valid motor Hall/phase signal, or the motor/controller circuit has a fault.

What to check:

1. Power off the scooter and inspect the motor cable, especially where it exits the axle.
2. Reseat the motor phase/Hall connectors and check for bent pins, moisture, or heat damage.
3. Lift the wheel and rotate it by hand; strong resistance, jerking, or grinding can indicate a phase/controller problem.
4. If the wiring is intact, test the motor Hall signals and controller with known-good parts.

If the issue remains: Do not continue riding with a motor/Hall fault. Have the motor and controller diagnosed together.

What it means: The throttle signal is outside its expected range or the throttle is not at the neutral position.

What to check:

1. Power the scooter off and make sure the throttle returns fully to its rest position without rubbing the grip or switch housing.
2. Restart without touching the throttle.
3. Inspect the throttle connector and cable for looseness, damage, water ingress, or a detached magnetic/sensor component.
4. If the fault returns, test or replace the throttle assembly.

Safety: Do not ride if the throttle sticks or the scooter accelerates without a deliberate throttle command.

If the issue remains: If a new throttle does not clear the fault, have the controller input and wiring harness checked.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: Battery voltage has fallen below the controller's safe operating threshold.

What to check:

1. Fully charge the battery with the correct charger and verify that the charger completes its normal cycle.
2. Inspect the battery/main connector and charging connector for poor contact or heat damage.
3. If the fault occurs mainly during acceleration or hills, the battery may be sagging under load.
4. Check the displayed voltage before and during load; a sudden large drop suggests battery, BMS, or high-resistance connection problems.

If the issue remains: Have the battery capacity, BMS, main connector, and controller input tested. Do not bypass low-voltage protection.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The controller is not receiving a valid motor Hall/phase signal, or the motor/controller circuit has a fault.

What to check:

1. Power off the scooter and inspect the motor cable, especially where it exits the axle.
2. Reseat the motor phase/Hall connectors and check for bent pins, moisture, or heat damage.
3. Lift the wheel and rotate it by hand; strong resistance, jerking, or grinding can indicate a phase/controller problem.
4. If the wiring is intact, test the motor Hall signals and controller with known-good parts.

If the issue remains: Do not continue riding with a motor/Hall fault. Have the motor and controller diagnosed together.

What it means: The controller has reached its thermal-protection threshold.

What to check:

1. Stop riding and allow the scooter to cool completely in a shaded, ventilated area.
2. Check for heavy load, long hill climbs, brake drag, low tire pressure, or repeated full-throttle operation that can cause excessive heating.
3. Inspect the controller area and related connectors for abnormal heat, loose mounting, or damage.
4. After cooling, restart and test gently.

If the issue remains: If the error returns quickly during normal riding, have the controller, wiring, and related sensors/controller circuitry checked.

What it means: Battery voltage has fallen below the controller's safe operating threshold.

What to check:

1. Fully charge the battery with the correct charger and verify that the charger completes its normal cycle.
2. Inspect the battery/main connector and charging connector for poor contact or heat damage.
3. If the fault occurs mainly during acceleration or hills, the battery may be sagging under load.
4. Check the displayed voltage before and during load; a sudden large drop suggests battery, BMS, or high-resistance connection problems.

If the issue remains: Have the battery capacity, BMS, main connector, and controller input tested. Do not bypass low-voltage protection.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The controller has reached its thermal-protection threshold.

What to check:

1. Stop riding and allow the scooter to cool completely in a shaded, ventilated area.
2. Check for heavy load, long hill climbs, brake drag, low tire pressure, or repeated full-throttle operation that can cause excessive heating.
3. Inspect the controller area and related connectors for abnormal heat, loose mounting, or damage.
4. After cooling, restart and test gently.

If the issue remains: If the error returns quickly during normal riding, have the controller, wiring, and related sensors/controller circuitry checked.

What it means: The display/instrument and controller are not exchanging data correctly.

What to check:

1. Turn the scooter off and reseat the display-to-controller communication connectors.
2. Inspect pins for bending, corrosion, moisture, or a connector that is not fully locked.
3. Check the cable where it passes through the stem/folding area for crushing or internal breakage.
4. If the cable is good, test the display and controller one at a time with known-good parts.

If the issue remains: Replace the failed communication cable, display, or controller after confirming which side is not sending/receiving data.

What it means: The throttle signal is outside its expected range or the throttle is not at the neutral position.

What to check:

1. Power the scooter off and make sure the throttle returns fully to its rest position without rubbing the grip or switch housing.
2. Restart without touching the throttle.
3. Inspect the throttle connector and cable for looseness, damage, water ingress, or a detached magnetic/sensor component.
4. If the fault returns, test or replace the throttle assembly.

Safety: Do not ride if the throttle sticks or the scooter accelerates without a deliberate throttle command.

If the issue remains: If a new throttle does not clear the fault, have the controller input and wiring harness checked.

What it means: The brake cut-off/lever signal is abnormal or the brake lever is not returning to its normal position.

What to check:

1. Release both brake levers fully and confirm they return smoothly.
2. Check the brake cut-off sensor/lever connector and cable for damage or a loose plug.
3. Power-cycle the scooter without holding either brake.
4. If the display still shows a brake fault, test the brake lever/sensor and related wiring.

Safety: Brake faults are safety-critical; do not ride until both mechanical braking and electrical cut-off behavior are normal.

If the issue remains: Replace the faulty brake lever/cut-off sensor or repair the wiring. Confirm normal braking before riding.

What it means: The controller is not receiving a valid motor Hall/phase signal, or the motor/controller circuit has a fault.

What to check:

1. Power off the scooter and inspect the motor cable, especially where it exits the axle.
2. Reseat the motor phase/Hall connectors and check for bent pins, moisture, or heat damage.
3. Lift the wheel and rotate it by hand; strong resistance, jerking, or grinding can indicate a phase/controller problem.
4. If the wiring is intact, test the motor Hall signals and controller with known-good parts.

If the issue remains: Do not continue riding with a motor/Hall fault. Have the motor and controller diagnosed together.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The controller has detected an internal power-stage, sensor, or control fault.

What to check:

1. Turn the scooter off, wait at least 30 seconds, and restart it.
2. Inspect the controller connectors and main harness for loose plugs, water ingress, burnt pins, or damaged cables.
3. Check whether the wheel is mechanically free and whether the motor cable is undamaged.
4. If the fault returns immediately, avoid repeated high-current testing.

Safety: Do not open or modify a sealed controller while the battery is connected.

If the issue remains: The controller and motor wiring should be tested by the dealer; replace the controller if an internal fault is confirmed.

What it means: The scooter is reporting an abnormal battery, charging, or voltage condition.

What to check:

1. Charge the battery with the correct original-spec charger and observe the charger indicator.
2. Inspect the charging port, battery connector, and main wiring for looseness, heat, or moisture.
3. Check whether the error appears only under acceleration, which can indicate voltage sag.
4. If possible, have the battery voltage and capacity tested by the dealer.

If the issue remains: Service or replace the battery/BMS, charger, or damaged wiring after diagnosis. Do not open the lithium battery pack yourself.

What it means: The controller is not receiving a valid motor Hall/phase signal, or the motor/controller circuit has a fault.

What to check:

1. Power off the scooter and inspect the motor cable, especially where it exits the axle.
2. Reseat the motor phase/Hall connectors and check for bent pins, moisture, or heat damage.
3. Lift the wheel and rotate it by hand; strong resistance, jerking, or grinding can indicate a phase/controller problem.
4. If the wiring is intact, test the motor Hall signals and controller with known-good parts.

If the issue remains: Do not continue riding with a motor/Hall fault. Have the motor and controller diagnosed together.