P0CDADrive Motor A Position Sensor Circuit C
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0CDA belongs to the rotor position sensor of drive motor A, normally a resolver: an excited stator winding induces signals in pick-up windings so the motor controller can work out rotor angle and speed. SAE counts the circuits of this sensor as A, B and C; GM, for instance, assigns circuit A to the S1/S3 winding and circuit B to S2/S4. What circuit C carries is not described in any public manufacturer document; the excitation winding or an additional signal path would be plausible, but neither is confirmed. No manufacturer publicly documents P0CDA, so CARB's demand to monitor electric drive inputs for circuit faults is the basis. Without a trustworthy angle the inverter cannot control torque, and the system limits or stops electric drive. Plausibility faults are P0CDB, low and high P0CDC and P0CDD.
- What you may notice
- Hybrid system warning and MIL
- Electric drive limited or unavailable, engine runs more
- Reduced regenerative braking
- Likely causes
- LikelyLoose, corroded or damaged resolver connector between motor and inverter
- PossibleDamaged resolver wiring
- RareResolver winding of circuit C defective
- RareEvaluation circuit in the motor control module faulty
- 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.