Velotric Discover 2 and Velotric Summit 1 Error Codes Troubleshooting Guide

When your Velotric Discover 2 electronic control system operates abnormally, the display will indicate the
error code as the image shown below.

Note: The error code will disappear when the error is solved.

 

System Communication - Error Code

Error Code	Code Definition	Troubleshooting Guide
E02	Display Communication Failure	1. Check if the wiring harness is loose, damaged or broken. 2. Unplug the connectors and check if the pins are bent, making contact improperly, or if foreign objects are causing a short circuit. 3. Replace the display, if the above steps do not work.
E04	Display and Motor Controller Communication Failure	1. Check if the wiring harness is loose, damaged or broken. 2. Unplug the connectors and check if the pins are bent, making contact improperly, or if foreign objects are causing a short circuit. 3. Replace the motor controller, if the above steps do not work.
E03	Display Communication Failure with Battery	1. Check if the power plug pins on the battery (male/female) are loose, if there are any foreign objects if the female pins are abnormally enlarged, etc. 2. Replace the motor controller, if step 1 does not work. 3. Replace the battery, if step 2 does not work.

 

Display - Error Code

Error Code	Code Definition	Troubleshooting Guide
E10	Photosensitive Sensor Abnormality	Replace the display.
E11	Abnormal 5V Voltage	Replace the display.
E12	Excessive Power Supply to Front Light	1. If the light can turn on and off normally, no action is needed. 2. If the light can not turn on and off, then replace the display.
E13	Front Light Power Supply Too Low	1. If the light can turn on and off normally, no action is needed. 2. If the light can not turn on and off, then replace the display.
E14	Open Circuit in Front Light	1. Check for any damage or breakage in the wiring harness, loose connectors, etc. 2. Unplug the connectors and check for any bent pins, foreign objects, etc. 3. Replace the front light, if the above steps do not work.
E16	Overcurrent in Front Light	1. Check for any damage or breakage in the wiring harness, loose connectors, etc. 2. Unplug the connectors and check for any bent pins, foreign objects, etc. 3. Replace the front light, if the above steps do not work.
E17	Short Circuit in Front Light	1. Check for any damage or short circuits in the front light wiring harness. 2. Unplug the front light connector and check for any bent pins, improper contact, or foreign objects causing a short circuit. 3. Replace the front light, if the above steps do not work.
E18	Display Bluetooth Malfunction	Replace the display.
E20	Excessive Power Supply to Display	1. no action is needed. * Usually occurs during high-speed gliding + motor unidirectional jamming. * Power supply exceeds the system's designed voltage (usually occurs with non-velotric batteries or external power supplies).
E21	Low Power Supply to Display	1. Charge the battery.

 

 

Motor Controller - Error Code

Error Code	Code Definition	Troubleshooting Guide
E30	Current Sensor Malfunction	Replace the motor controller.
E31	MOS Drive Voltage Too High	Replace the motor controller.
E32	MOS Drive Voltage Too Low	Replace the motor controller.
E33	MOS Short Circuit	Replace the motor controller.
E34	Abnormal 5V Voltage	Replace the motor controller.
E35	Throttle Open Circuit	1. Check for any damage or breakage in the throttle wiring harness, loose connectors, etc. 2. Unplug the connectors and check for any bent pins, foreign objects, etc. 3. Replace the throttle, if the above steps do not work.
E36	Throttle Overcurrent	1. Check for any damage or short circuits in the throttle wiring harness. 2. Unplug the throttle connector and check for any bent pins, improper contact, or foreign objects causing a short circuit. 3. Replace the throttle, if the above steps do not work.
E37	Throttle Ground Wire Protection	1. Check for any damage or breakage in the throttle wiring harness. 2. Unplug the throttle connector and check for any bent pins, foreign objects on the pin surface, corrosion, oxidation, etc. 3. Replace the throttle, if the above steps do not work.
E40	Overcurrent Protection	1. Stop, turn off the bike, and restart. 2. If the fault recurs repeatedly, replace the motor controller.
E41	Throttle Not Reset	1. Check if the throttle got stuck by rubbing against other components. If so, adjust the installation spacing or angle of the throttle. 2. Check if the throttle spring is insufficient. If so, replace the throttle.
E42	Anti-flyaway Protection	1. Reset/reposition the throttle to resolve the error code. 2. Check as per the procedure for E37/E41, if step 1 does not work.
E43	Low Voltage Protection	1. Charge the battery.
E44	Overvoltage Protection	1. no action is needed. * Usually occurs during high-speed gliding + motor unidirectional jamming. * Power supply exceeds the system's designed voltage (usually occurs with non-velotric batteries or external power supplies).
E45	MC High-Temperature Protection	1. Rest for more than 20 minutes to allow the motor controller temperature to decrease to a safe range. (When E45 appears, the power output of the bike will decrease, and eventually stop working.)
E46	Stall Protection	1. Stop riding, reset the throttle, then resume riding to resolve the issue.
E47	Brake Sensor Abnormal	For Discover 2 1. Identify the problematic brake sensor if it is on the left or right side by disconnecting the brake sensor connector. (If the error code disappeared after disconnecting the brake sensor connector, then that is the problematic one) 2. Inspect the brake sensor wiring for any signs of damage or short circuits. 3. Replace the brake sensor on the faulty side. 4. If the above checks are ineffective, replace the integrated cable. 5. If the replacement integrated cable is ineffective, then replace the motor controller. (Very rare in this case theoretically) For Summit 1 1. Identify the problematic brake sensor if it is on the left or right side by disconnecting the brake sensor connector. (If the error code disappeared after disconnecting the brake sensor connector, then that is the problematic one) 2. Inspect the brake sensor wiring for any signs of damage or short circuits. 3. Adjust the grip distance adjustment screw of the faulty brake lever by turning it clockwise until 2-3 threads are exposed. 4. If the above checks are ineffective, replace the integrated cable. 5. If the replaced integrated cable is ineffective, then replace the motor controller. (Very rare in this case theoretically)
E50	5V Power Supply Overcurrent	1. Check for any damage or short circuits in the torque sensor/motor wiring harness. 2. Unplug the torque sensor and motor wiring harness connectors and check for any bent pins, improper contact, or foreign objects causing a short circuit. 3. Disconnect the torque sensor and motor wiring harness connectors separately and check if the error code disappears. 4. If the error code disappears when a particular connector is disconnected, replace the corresponding component connected to that connector.

 

Motor - Error Code

Error Code	Code Definition	Troubleshooting Guide
E51	Motor Hall A Phase Damage	1. Check for any damage or short circuits in the motor wiring harness. 2. Unplug the motor wiring harness connector and check for any bent pins, improper contact, foreign objects, short circuits, etc. 3. Replace the motor controller, if step 2 does not work. 4. Replace the battery, if step 3 does not work.
E52	Motor Hall B Phase Damage	1. Check for any damage or short circuits in the motor wiring harness. 2. Unplug the motor wiring harness connector and check for any bent pins, improper contact, foreign objects, short circuits, etc. 3. Replace the motor controller, if step 2 does not work. 4. Replace the battery, if step 3 does not work.
E53	Motor Hall C Phase Damage	1. Check for any damage or short circuits in the motor wiring harness. 2. Unplug the motor wiring harness connector and check for any bent pins, improper contact, foreign objects, short circuits, etc. 3. Replace the motor controller, if step 2 does not work. 4. Replace the battery, if step 3 does not work.
E54	Motor Phase Line Short Circuit	1. Check for any damage or short circuits in the motor wiring harness. 2. Unplug the motor wiring harness connector and check for any bent pins, improper contact, foreign objects, short circuits, etc. 3. Replace the motor controller, if step 2 does not work. 4. Replace the battery, if step 3 does not work.
E55	Speed Sensor Malfunction	1. Check for any damage or short circuits in the motor wiring harness. 2. Unplug the motor wiring harness connector and check for any bent pins, improper contact, foreign objects, short circuits, etc. 3. Replace the motor controller, if step 2 does not work. 4. Replace the battery, if step 3 does not work.
E56	Motor Temperature Sensor Malfunction	1. Check for any damage or short circuits in the motor wiring harness. 2. Unplug the motor wiring harness connector and check for any bent pins, improper contact, foreign objects, short circuits, etc. 3. Replace the motor controller, if step 2 does not work. 4. Replace the battery, if step 3 does not work.
E5A	Motor Overheating	1. Rest for more than 20 minutes to allow the motor controller and motor temperature to decrease to a safe range. (When E45 appears, the power output of the bike will decrease, and eventually stop working.)

 

Torque Sensor - Error Code

Error Code	Code Definition	Troubleshooting Guide
E60	Torque Sensor Open Circuit	1. Check for any damage or breakage in the torque sensor wiring harness. 2. Unplug the torque sensor wiring harness connector and check for any bent pins or foreign objects. 3. Replace the torque sensor and check if the error code disappears. If the error code persists, restart the system. 4. If the error code still exists after restarting the system, then replace the motor controller.
E61	Torque Sensor Overcurrent	1. Check for any damage or short circuits in the torque sensor wiring harness. 2. Unplug the torque sensor wiring harness connector and check for any bent pins, improper contact, or foreign objects causing a short circuit. 3. Disconnect the torque sensor connector and check if the error code disappears. 4a. If the error code disappears, replace the torque sensor. 4b. If the error code persists, restart the system. If the error code still exists after restarting the system, replace the motor controller.
E62	Abnormal Output from Torque Sensor	0. Incorrect torque signal output from the torque sensor (First, pedal two rounds and then restart the system. If the fault persists, follow the steps below) 1. Check for any damage or breakage in the torque sensor wiring harness. 2. Unplug the torque sensor wiring harness connector and check for any bent pins or foreign objects. 3. Replace the torque sensor and check if the error code disappears. If the error code persists, restart the system. 4. If the error code still exists after restarting the system, then replace the motor controller.
E63	Abnormal Cadence Signal	0. Incorrect torque signal output from the torque sensor (First, pedal two rounds and then restart the system. If the fault persists, follow the steps below) 1. Check for any damage or breakage in the torque sensor wiring harness. 2. Unplug the torque sensor wiring harness connector and check for any bent pins or foreign objects. 3. Replace the torque sensor and check if the error code disappears. If the error code persists, restart the system. 4. If the error code still exists after restarting the system, then replace the motor controller.
E64	Sensor Zero Point Abnormality	0. Calibration: Turn the power switch on and off 20 times. (If it cannot be restored, follow the steps below.) For Individual Customer 1. If calibration is not possible, replace the controller. 2. After calibration, if there is no power and the real-time value of torque does not change when pedaling, replace the torque sensor. For Clients with Certified Tools 3. Connect to the Velotric host computer, check the torque signal zero point and real-time value, and use the calibration button.

 

Front & Rear Light - Error Code

Error Code	Code Definition	Troubleshooting Guide
E70	Tail Light Open Circuit (Rear Light not Illuminated)	1. Check for any damage or breakage in the rear light wiring harness, loose connectors, etc. 2. Unplug the connector and check for any bent pins, foreign objects, etc. 3. Replace the rear light, if the above steps do not work.
E71	Tail Light Overcurrent	1. Check for any damage or breakage in the rear light wiring harness, loose connectors, etc. 2. Unplug the connector and check for any bent pins, foreign objects, etc. 3. Replace the rear light, if the above steps do not work.
E73	Front Light Overvoltage	1. If the front light can turn on and off normally, no action is needed. 2. If the front light can not turn on and off, then replace the motor controller.
E74	Front Light Undervoltage	1. If the front light can turn on and off normally, no action is needed. 2. If the front light can not turn on and off, then replace the motor controller.
E75	Front Light Open Circuit (Front Light not Illuminated)	1. Check for any damage or breakage in the front light wiring harness, loose connectors, etc. 2. Unplug the connector and check for any bent pins, foreign objects, etc. 3. Replace the front light, if the above steps do not work.
E76	Front Light Overcurrent	1. Check for any damage or breakage in the front light wiring harness, loose connectors, etc. 2. Unplug the connector and check for any bent pins, foreign objects, etc. 3. Replace the front light, if the above steps do not work.
E77	Front Light Short Circuit (Front Light not Illuminated)	1. Check for any damage or breakage in the front light wiring harness, loose connectors, etc. 2. Unplug the connector and check for any bent pins, foreign objects, etc. 3. Replace the front light, if the above steps do not work.

 

Battery - Error Code

Error Code	Code Definition	Troubleshooting Guide
E90, E91, E92, E93, E94, E95, E96, E97, E98, E9A, E9E, E9F, EA0	Battery Hardware Abnormal	1. Replace the battery.
EA1	Cell Low Temperature Charging Protection (Unable to Charge Cell)	1. Place the battery indoors for more than 1 hour. Once the battery temperature rises above 43 degrees Fahrenheit, charging can proceed normally.
EA2	Cell Low Temperature Charging Protection (Unable to Discharge Cell)	1. Place the battery indoors for more than 1 hour. Once the battery temperature rises above 12 degrees Fahrenheit, the battery can be used normally.
EA3	Cell High Temperature Charging Protection	1. Place the battery in a cool and ventilated area for more than 1 hour. Once the battery temperature decreases, charging can proceed normally.
EA4	Cell High Temperature Discharge Protection	1. Place the battery in a cool and ventilated area for more than 1 hour. Once the battery temperature decreases, charging can proceed normally.
EA5	MOS High Temperature Protection	1. Stop biking or charging, place the battery in a cool and ventilated area for more than 1 hour, then it can be charged normally.
EA6	Overcurrent Protection during Charging	1. Stop charging, and inspect the charger. 2. If the error code persists, then replace the charger.
EA7	First-level Overcurrent Protection during Discharge	1. Restart the system, 2. If the error code occurs frequently, replace the motor controller.
EA8	Second-level Overcurrent Protection during Discharge Fault Cause: System Overcurrent	1. Restart the system, 2. If the error code occurs frequently, replace the motor controller.
EA9	Discharge Short Circuit Protection	If the battery can be charged when removed from the bike and the battery level indicator shows normal, then 1. Check for any damaged wiring harnesses for short circuits, 2. Inspect the power connectors for foreign objects, pin misalignment, or short circuits, 3. Replace the motor controller, if the above steps do not work.
EAA	Abnormal Charging Protection of Charger	1. Check the charger, 2. If the error code persists, then replace the charger.
EAB	Loss of DET Present Signal	1. Check if there are any loose, expanded, or foreign objects in the battery power connector. 2. Test with a normal battery replacement. 3. Remove the lower base of the vehicle and check if the battery socket harness is damaged.
EAD	Battery State of Health (SOH) Abnormal	1. Replace the battery, since the battery's end of life is reached.
EAR	BUS Voltage Exceeds Standard Value	1. Typically occurs during high-speed coasting with the motor freewheeling. 2. Power supply exceeds the system's design voltage (typically occurs with illegal batteries or external power supply).
0XAF	Battery Water Damage	1. Cease the usage of the battery immediately, and replace the battery.

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