P0C07Drive Motor A Phase U-V-W Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0C07 is the high member of the drive motor A phase circuit group: a U, V or W phase line reads higher than it should, most likely through a short to the positive high-voltage rail or a power switch that stays on. Its siblings are P0C05 for an open phase and P0C06 for a phase pulled low. No manufacturer documents P0C07 publicly; among these three, GM uses only P0C05, which watches for missing phase current. CARB requires circuit monitoring of hybrid input and output components. Because a stuck high phase drives uncontrolled current, the inverter normally disables motor A at once. The driver sees a warning lamp and loses some or all electric propulsion until the shorted part is replaced.
- What you may notice
- Immediate shutdown of electric drive with warning lamp
- Reduced performance or engine-only operation
- Likely causes
- PossibleShorted high-side power switch in the motor A inverter
- PossiblePhase cable shorted to the positive high-voltage path
- RareFaulty gate driver holding a switch on
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €200 – €6,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.