RideFixerGeneric displays error code
Generic displays error 21: Speed sensor fault
Medium severity Service soon
Can I ride home with this error?
Ride with caution. Safe to pedal without assist.
What it means
The system cannot read wheel speed. C961 uses Bafang protocol V4.0.
Likely causes
- Speed sensor or magnet moved
- Damaged cable
Symptoms
- 21 flashes
- Motor stops
How to fix it
- Check the speed sensor and magnet line up.
- Check the sensor cable.
- If the code stays, take the bike to your dealer or an e-bike repair shop.
How urgent is it?
Needs checking.
Applies to
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