Bafang · Controller
37 Bafang error code 37
WDT (watchdog) circuit fault
Per manufacturer documentation
Note
Meaning may depend on model, display and firmware – verify with the manual of the exact type.
Possible causes
General, component-based causes – not a manufacturer-specific statement.
- Internal controller fault (power stage, supply)
- Over-current or short on the motor/phase side
- Firmware/configuration error
Safe test steps
- Burnt smell, discoloration, water traces on the controller.
- Rule out motor, Hall, throttle and brake signal before replacing the controller.
Workshop reference values
- No general documented measurement value – manufacturer service documentation required.
Repair approach
- Fit a controller of the same voltage/current class and compatible protocol.
Tools needed
- Digital multimeter (CAT III, fused inputs)
- Basic hand tools, insulated screwdrivers
- Manufacturer dealer diagnostic tool/software (if available)
Safety
- Do not reconnect a controller suspected of a short to the battery.
This information does not replace manufacturer service documentation. Work on batteries and high-voltage parts only with the appropriate expertise.