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.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
Common causes
Ordered by how often each turns out to be the cause.
- Phase wire shorted to high voltageCommon
- Open motor windingPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Drive Motor B Phase Uvw
- Drive Motor B Inverter
P0C0A is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.