Xiaomi · Motor phase
12 Xiaomi error code 12
Abnormal current in motor phase B
Widely published – may differ by model/firmware
Note
Table published for Xiaomi/Segway-Ninebot scooters; may differ by model/firmware.
Possible causes
General, component-based causes – not a manufacturer-specific statement.
- Burnt/loose phase connector
- Damaged phase cable
- Winding short or open circuit
- Controller power stage (MOSFET) fault
Safe test steps
- Battery disconnected, controller unplugged: compare A–B, B–C, C–A resistance.
- Does the motor resist rotation even with the controller unplugged?
- Discoloured or melted connectors.
Workshop reference values
- The three phase resistances should be close (typically ≤ 10 % apart); absolute value is motor-specific, often < 1 Ω.
Repair approach
- Replace connector/cable; for winding damage replace or professionally rewind the motor.
- For MOSFET faults repair/replace the controller.
Tools needed
- Digital multimeter (CAT III, fused inputs)
- Milliohm meter (4-wire) – for low resistances
- Basic hand tools, insulated screwdrivers
Safety
- Disconnect phase wires only when unpowered; do not re-power a shorted controller.
This information does not replace manufacturer service documentation. Work on batteries and high-voltage parts only with the appropriate expertise.
Related fault codes
11Abnormal current in motor phase A13Abnormal current in motor phase C10Communication error between dashboard and control board14Throttle fault / not in zero position15Brake lever fault / not in zero position18Motor Hall sensor fault21Battery (BMS) communication fault22BMS password/authentication error