P0CDCDrive Motor A Position Sensor Circuit C Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0CDC reports that circuit C of the rotor position sensor on drive motor A reads below its permitted window. Typical reasons are a short to ground, a short between windings or a low-resistance path through moisture in the connector. For circuits A and B GM shows how such a test works: the motor control processor compares the sensed resolver voltage with a threshold and sets a Type B code when it stays out of range for 0.25 s within a 0.375 s window (P0C52, P0C5C). No manufacturer publicly documents the circuit C version, and what that circuit carries is not published. As soon as the angle signal becomes unreliable, the inverter reduces or stops electric drive torque, and regeneration may be cut as well. Check plug and harness to the inverter before replacing parts. The high fault is P0CDD.
- What you may notice
- Hybrid system warning and MIL
- Electric drive limited, engine runs instead
- Reduced or no regenerative braking
- Likely causes
- LikelyCircuit C wire shorted to ground or to another resolver wire
- PossibleMoisture or corrosion in the resolver connector
- RareResolver winding internally shorted
- 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.