P0C54Drive Motor A Position Sensor Circuit A Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0C54 stands for short dropouts or jumps on Circuit A of the motor A resolver that never last long enough to count as a steady low or high fault. No manufacturer documents this code publicly. GM handles the same situation differently: on its 2013 eAssist cars the resolver circuit checks run a retry scheme that lets the drive recover from brief faults, and only light the MIL through P0C52 or P0C53 once the trouble repeats, either about 5 s of failure within roughly 10 s or 10 s of accumulated failure over 30 minutes. Typical triggers are loose terminals, a cable that moves with the drivetrain or moisture in the plug. The fault often vanishes after a restart and returns under vibration or heat.
- What you may notice
- Warning lamp that appears and disappears between trips
- Brief loss of electric drive or a short jerk
- Fault often gone after a restart
- Likely causes
- LikelyLoose or poorly crimped terminal in a Circuit A line
- PossibleHarness rubbing or flexing at a point that moves with the powertrain
- PossibleMoisture or contamination in the resolver plug
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.