P0C5ADrive Motor A Position Sensor Circuit B
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0C5A is the base circuit code for Circuit B, the second pickup winding of the motor A resolver; GM calls it the S2/S4 winding, set 90 degrees from the S1/S3 winding of Circuit A. The code is meant for a fault on that winding which the controller cannot class as a low or high level. No manufacturer documents this code publicly. GM checks the S2/S4 line only through P0C5C and P0C5D. If P0C5A appears on its own, the problem is limited to the second winding and its two wires; if P0C50 is stored too, a shared part such as the connector or the excitation side is more likely. P0A3F, by contrast, covers a lost angle signal without naming a winding. Expect a warning and possibly no electric drive.
- What you may notice
- Check engine lamp with drive system warning
- Electric drive limited or unavailable
- Vehicle may refuse to enter ready mode
- Likely causes
- LikelyOpen wire or loose terminal in the S2/S4 (Circuit B) lines
- PossibleDamaged or corroded resolver connector
- PossibleDefective second pickup winding in the resolver stator
- 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: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.