P0C50Drive Motor A Position Sensor Circuit A
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- A resolver has two pickup windings set 90 degrees apart, one giving a sine and one a cosine signal. The codes P0C50 onward judge each of those circuits on its own, while P0A3F to P0A43 judge the combined angle signal. GM names the S1/S3 winding Circuit A and the S2/S4 winding Circuit B. P0C50 is the general entry for Circuit A of motor A, used when the controller sees a fault in that line without classing it as a low or high reading. No manufacturer documents this code publicly; GM covers the same winding only through P0C52 and P0C53. CARB requires circuit faults of such inputs to be detected and stored separately from out-of-range faults. Expect a warning lamp and possibly lost electric drive.
- What you may notice
- Hybrid or drive system warning together with the check engine lamp
- Electric drive switched off or reduced power
- Vehicle may not reach ready mode
- Likely causes
- LikelyOpen wire or loose terminal in the Circuit A (first pickup winding) lines
- PossibleCorroded or damaged connector between resolver and motor control module
- PossibleDefective pickup winding inside the resolver stator
- RareFault in the resolver input stage of the motor control module
- 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.