Powertrain, generic · Hybrid propulsion

P0C68 Generator Position Sensor Circuit A Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Resolver connector with poor contact that opens under vibration
Harness rubbing through intermittently in the transaxle or generator area
Bursts of interference from nearby phase cables due to harness routing
Contact or winding joint that fails only at high temperature

Symptoms

  • Warning lamp that comes and goes
  • Brief jolts or interruptions in generator operation
  • Fault appears mainly on bad roads or after long drives

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–4,000
Time1–8 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

generator position sensor awiring harnesshybrid control module

Related codes

P0C64P0C66P0C67P0C6DP0A4F

References: static.nhtsa.gov, law.cornell.edu, mitsubishitechinfo.com.