P0C5EDrive Motor A Position Sensor Circuit B 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
- P0C5E captures brief interruptions or spikes on Circuit B, the second winding of the motor A resolver, that clear again before a firm low, high or plausibility fault can be confirmed. No manufacturer documents this code publicly. GM leaves such events to the debounce of P0C5C and P0C5D, which on its eAssist cars tolerates short outages and only reports a repeating pattern. Where P0C5E is used, the search starts at the mechanical joints of the S2/S4 path: crimp quality, terminal grip, a cable clip that lets the harness rub on the transmission. Checking resistance while flexing the harness tends to reveal it. P0C54 is the same fault on Circuit A; both together point to the common connector.
- What you may notice
- Warning light appearing only now and then
- Momentary drop of electric torque
- No fault found on a stationary check
- Likely causes
- LikelyLoose or weak terminal in the S2/S4 path
- PossibleHarness rubbing on the transmission because of a missing or broken clip
- RareMoisture entering 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.