OBD-II code · Powertrain (generic)
P0C0A Drive Motor B Phase U-V-W Circuit High
The drive motor B phase U-V-W output reports a circuit high condition. The drive motor's position, current and temperature are watched continuously; a fault here downgrades the inverter to a safe operating point or triggers torque reduction.
Is it safe to drive with P0C0A?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyPhase wire shorted to high voltage
- PossibleOpen motor winding
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 3–16 h
- Emissions test
- Usually unaffected
- Parts involved
- Drive Motor B Phase Uvw, Drive Motor B Inverter
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.