P0C6DGenerator Position Sensor Circuit B 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
- 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.
- What you may notice
- Intermittent warning lamp
- Short jerks or charging interruptions in hybrid mode
- Fault hard to reproduce in the workshop
- Likely causes
- LikelyTerminal with reduced contact pressure in the circuit B connector
- PossibleMoisture entering through a damaged connector seal
- PossibleHarness moving against a bracket or edge and breaking contact
- RareInterference spikes from phase cables near the resolver lines
- 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.