Powertrain, generic · Hybrid propulsion

P0C6D Generator Position Sensor Circuit B Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0C6D records short, irregular disturbances on circuit B of the generator resolver: the signal flickers, loses samples or jumps, but each event is too brief to count as a hard low or high reading (P0C6B, P0C6C). Because the angle is computed from both windings, even short glitches on the second winding can make the inverter lose track of the rotor for a moment, which may be felt as a jolt or a brief break in charging. No manufacturer documents P0C6D publicly. Typical sources are a terminal with reduced contact pressure, a seal that lets moisture in, or a harness that moves against a bracket. GM's 2011-12 Volt shows how much vibration matters for resolver plugs (PIC6136A). Wiggle tests with live data help to localise such faults; P0C68 is the circuit A equivalent.

Likely causes

Terminal with reduced contact pressure in the circuit B connector
Moisture entering through a damaged connector seal
Harness moving against a bracket or edge and breaking contact
Interference spikes from phase cables near the resolver lines

Symptoms

  • Intermittent warning lamp
  • Short jerks or charging interruptions in hybrid mode
  • Fault hard to reproduce in the workshop

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 bwiring harnesshybrid control module

Related codes

P0C69P0C6BP0C6CP0C68P0A4F

References: static.nhtsa.gov, law.cornell.edu, en.wikipedia.org.