P0C68Generator Position Sensor Circuit A Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Warning lamp that comes and goes
- Brief jolts or interruptions in generator operation
- Fault appears mainly on bad roads or after long drives
- Likely causes
- 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
- RareContact or winding joint that fails only at high temperature
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.