P0C68 code meaning
Generator Position Sensor Circuit A Intermittent/Erratic
Powertrain system Generic code P0Cxx codes Check engine light
What P0C68 means
P0C68 is stored when circuit A of the generator resolver drops out or jumps for short moments and then looks normal again, so neither the low nor the high limit is held long enough to set P0C66 or P0C67. Vibration at a connector, a chafed lead or contacts that loosen with heat are the usual suspects. No manufacturer documents P0C68 publicly. GM gives a practical example for this kind of weakness: on the 2011-12 Volt it replaced the original 2x4 resolver plug of motor A, a part GM lists as the generator position sensor stator, with a sealed 1x6 plug because the signal suffered under vibration, and warns that a misplaced harness lets the phase cables disturb the signal (PIC6136A). Such faults often appear only on rough roads or when hot.
P0C68 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0C68
- Warning lamp that comes and goes
- Brief jolts or interruptions in generator operation
- Fault appears mainly on bad roads or after long drives
Common causes of P0C68
- Most likelyResolver connector with poor contact that opens under vibration
- PossibleHarness rubbing through intermittently in the transaxle or generator area
- PossibleBursts of interference from nearby phase cables due to harness routing
- Less likelyContact or winding joint that fails only at high temperature
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Generator position sensor aWiring harnessHybrid control module
What each part of P0C68 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. |
| 68 | The exact fault in that area. |
What to do next
- Note P0C68 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 P0C68
What does P0C68 mean?
P0C68 means "Generator Position Sensor Circuit A Intermittent/Erratic". P0C68 is stored when circuit A of the generator resolver drops out or jumps for short moments and then looks normal again, so neither the low nor the high limit is held long enough to set P0C66 or P0C67. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C68?
Drive gently and only to a workshop. With P0C68 the car can go into limp mode (reduced power) to protect itself.
Will P0C68 fail an emissions test?
Yes, it can. P0C68 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 P0C68 to fix?
Difficulty: workshop only. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P0C68 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.