P0C5FDrive Motor B 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
- P0C5F is the umbrella circuit code for Circuit B of the motor B resolver, which GM wires as the S2/S4 winding of the second traction motor. It fits a fault on that winding that the controller notices but cannot assign to a low or high reading. No manufacturer documents this code publicly; on GM's dual-motor hybrids the same winding is covered by P0C61 and P0C62 only. Together, P0C55 and P0C5F let a technician see whether one or both windings of motor B are affected: one alone points to that winding's wires, both together to the shared plug, the excitation or the motor control module. P0A45 reports the overall motor B angle signal. Expect a warning lamp and the loss of motor B.
- What you may notice
- Hybrid warning and check engine lamp
- Motor B shut off, lower propulsion
- Possible no-start on hybrids that crank with motor B
- Likely causes
- LikelyOpen wire or loose terminal in the motor B S2/S4 lines
- PossibleDamaged motor B resolver or pass-through connector
- PossibleDefective second pickup winding in the motor B resolver
- 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.