Shift Motor Phase U-V-W Circuit High
The output stage for the shift motor reports a high phase voltage on at least one of the U/V/W phases. Short to B+ or interrupted load.
Affected components
- Shift motor
- Shift motor position sensor
- Tcm
Common causes
- High likelihood: Phase wire shorted to B+
- Medium likelihood: Open motor winding
- Low likelihood: Connector pins corroded - high contact resistance
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.