Shift Motor Phase U-V-W Performance
The phase currents of the shift motor do not match the commanded commutation pattern within tolerance. Sensor or driver synchronisation off.
Affected components
- Shift motor
- Shift motor position sensor
- Tcm
Common causes
- High likelihood: Rotor position sensor offset
- Medium likelihood: Phase current imbalance
Possible symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Diagnostic notes
- The malfunction indicator lamp may illuminate
- Reduced-power or limp mode may occur
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.