P0C5F code meaning
Drive Motor B Position Sensor Circuit B
Powertrain system Generic code P0Cxx codes Check engine light
What P0C5F means
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.
P0C5F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0C5F
- Hybrid warning and check engine lamp
- Motor B shut off, lower propulsion
- Possible no-start on hybrids that crank with motor B
Common causes of P0C5F
- Most 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
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Drive motor b position sensor bWiring harnessHybrid control module
What each part of P0C5F means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| C | Area: hybrid propulsion. |
| 5F | The exact fault in that area. |
What to do next
- Note P0C5F and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0C5F
What does P0C5F mean?
P0C5F means "Drive Motor B Position Sensor Circuit B". 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 is a generic code, so it means the same on every make.
Is it safe to drive with P0C5F?
Drive gently and only to a workshop. With P0C5F the car can go into limp mode (reduced power) to protect itself.
Will P0C5F fail an emissions test?
Yes, it can. P0C5F is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0C5F to fix?
Difficulty: hard. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P0C5F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.