P0C6D code meaning
Generator Position Sensor Circuit B Intermittent/Erratic
Powertrain system Generic code P0Cxx codes Check engine light
What P0C6D means
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.
P0C6D 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 P0C6D
- Intermittent warning lamp
- Short jerks or charging interruptions in hybrid mode
- Fault hard to reproduce in the workshop
Common causes of P0C6D
- Most 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
- Less likelyInterference spikes from phase cables near the resolver lines
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Generator position sensor bWiring harnessHybrid control module
What each part of P0C6D 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. |
| 6D | The exact fault in that area. |
What to do next
- Note P0C6D 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 P0C6D
What does P0C6D mean?
P0C6D means "Generator Position Sensor Circuit B Intermittent/Erratic". 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). It is a generic code, so it means the same on every make.
Is it safe to drive with P0C6D?
Drive gently and only to a workshop. With P0C6D the car can go into limp mode (reduced power) to protect itself.
Will P0C6D fail an emissions test?
Yes, it can. P0C6D 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 P0C6D to fix?
Difficulty: workshop only. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P0C6D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.