P0C0EDrive Motor B Inverter Power Supply Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0C0E is the motor B counterpart of P0C0B: the inverter for the second motor has lost the supply of its gate-drive board. GM documents it on the Volt and the two-mode trucks. The IGBT module reports a bias fault through its status line when the supply of phase A, B or C fails. The 2011 Volt checks with high voltage above 100 V, the 2012 trucks with run/crank voltage between 9.5 and 18 V, both after one count, Type A. The 2016 Volt needs 0.002 s of fault in a 0.024 s window, the 2018 table 0.02 s, the 2019 table 0.168 s, always Type A, one trip. P0C0F and P0C10 cover low and high supply. Motor B can no longer be driven, so propulsion is reduced.
- What you may notice
- Malfunction indicator lamp after one drive
- Reduced propulsion message, motor B unavailable
- Engine runs continuously instead of electric driving
- Likely causes
- LikelyFailed gate-drive power supply inside the motor B inverter
- PossibleWeak 12 V feed, blown fuse or poor ground at the inverter control board
- RareLoose or corroded low-voltage connector at the power inverter module
- 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: €100 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.