P0C50 code meaning
Drive Motor A Position Sensor Circuit A
Powertrain system Generic code P0Cxx codes Check engine light
What P0C50 means
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.
P0C50 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 P0C50
- Hybrid or drive system warning together with the check engine lamp
- Electric drive switched off or reduced power
- Vehicle may not reach ready mode
Common causes of P0C50
- Most 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
- Less likelyFault in the resolver input stage of the motor control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Drive motor a position sensor aWiring harnessHybrid control module
What each part of P0C50 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. |
| 50 | The exact fault in that area. |
What to do next
- Note P0C50 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 P0C50
What does P0C50 mean?
P0C50 means "Drive Motor A Position Sensor Circuit A". A resolver has two pickup windings set 90 degrees apart, one giving a sine and one a cosine signal. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C50?
Drive gently and only to a workshop. With P0C50 the car can go into limp mode (reduced power) to protect itself.
Will P0C50 fail an emissions test?
Yes, it can. P0C50 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 P0C50 to fix?
Difficulty: hard. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P0C50 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.