P0C0FDrive Motor B Inverter Power Supply Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0C0F means the supply of the motor B inverter is present but below its permitted range. P0C0E covers a lost or open supply, P0C10 a supply that is too high, and P0C0C is the same fault on motor A. No manufacturer documents P0C0F publicly. GM's tables for P0C0E name the supply in question: the power feed of the gate-drive board, checked phase by phase with run/crank voltage between 9.5 and 18 V on the 2012 trucks. A sagging rail can no longer switch the power transistors fully, so the inverter protects itself. CARB requires circuit monitoring of hybrid components. The driver typically sees a warning and loses the electric drive of motor B.
- What you may notice
- Malfunction indicator lamp, hybrid system warning
- Reduced propulsion, motor B unavailable
- Fault appears mainly with low 12 V voltage, e.g. after standing
- Likely causes
- LikelyWeak 12 V battery or DC/DC converter output feeding the inverter electronics
- PossibleCorroded connector or poor ground raising resistance in the inverter supply
- PossibleFailing internal gate-drive power supply in the motor B inverter
- 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: €50 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.