Loss of motor function can be caused by something as simple as a loose connection but in other cases, it may be due to a damaged component. If there is a loss of function on your ebike and an error code is displayed, refer to the ERROR CODES section of the Help Desk to proceed with correcting the issue. In some cases, there may be no obvious explanation for the current issue. This guide will assist in diagnosing a loss of motor function when an error code is not present.
If the bike loses power to the motor while the bike is on, the first thing you should do is check for any clear signs of damage to the motor assembly or the cables and connections that supply power to the motor.
- If any connections are loose, check for dirt or damage and reconnect the connection. Follow up by testing the bike for proper function.
- If any cable, connection, or component is damaged, the associated part should be replaced. Once the new part is installed, test the bike for proper operation.
Depending on the model of the bike, the motor may either be a mid-drive or a hub-drive assembly. The associated harness and controller that sends power to the motor are also components that should be checked and replaced if necessary to regain the proper function of the bike.
The following troubleshooting applies to situations when there is ZERO motor function. If the motor functions with ONLY throttle or ONLY pedal assist, please follow these troubleshooting guides instead:
-Throttle Not Functioning & No Error Code Present
-No Pedal Assist & No Error Code Present
If all motor function is lost, and no error code is present, follow the steps below:
- Check the connection of the harness or controller cable that connects to the motor assembly. The most common cause of this issue is a loose motor plug connection or controller/harness connection. Check the connections from the controller to the motor and be sure they are free of dirt/grit and firmly pressed/threaded together. Retest the bike once completed.
- Damaged cables are the second most common culprit for loss of motor function. If the damage is on the motor side of the connection, the motor assembly will need to be replaced. If the damage is on the bike end of the connection, either the motor harness or the controller will need to be replaced, depending on the model of the ebike.
- Inspect the motor assembly for signs of damage or severe impact. Are there any abnormal sounds coming from the motor? If any clear damage is heard or seen to be present, the motor assembly should be replaced.
- If the problem bike has a hub-drive style motor, there is an external controller. If the motor and harness have already been replaced and the issue persists, the controller should be replaced next. (This does not apply to mid-drive bikes since the controller is contained within the mid-drive motor assembly).