P0C66 code meaning
Generator Position Sensor Circuit A Low
Powertrain system Generic code P0Cxx codes Check engine light
What P0C66 means
P0C66 means the signal of circuit A of the generator resolver has dropped below its lower limit. Mitsubishi uses it on the 2023 Outlander PHEV for the sine winding: the generator control unit, supplied with at least 8 V, watches the line continuously and sets the code when the sine voltage stays at or below 2.000 V for 0.21 s. A short to ground on a sine lead or a damaged winding are the classic causes; a Bosch patent shows that the averaged potential of the coil lines reveals whether a lead touches ground or supply. Mitsubishi first checks for radiator fan codes and tests the resolver circuit, and replaces the power drive unit, or later the generator, only if the code comes back. P0C67 is the high counterpart, P0C6B the same test on the cosine side.
P0C66 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 10 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0C66
- Malfunction indicator lamp and hybrid warning shortly after switching on
- Generator out of service, no charging by the engine
- Reduced driving power
Common causes of P0C66
- Most likelySine lead of the resolver shorted to ground or to the housing
- PossibleShorted or damaged sine winding in the generator resolver
- PossibleFaulty input stage in the power drive unit (generator control unit)
- Less likelyDamaged or contaminated resolver connector pins
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Generator position sensor aWiring harnessHybrid control module
What each part of P0C66 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. |
| 66 | The exact fault in that area. |
What to do next
- Note P0C66 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 P0C66
What does P0C66 mean?
P0C66 means "Generator Position Sensor Circuit A Low". P0C66 means the signal of circuit A of the generator resolver has dropped below its lower limit. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C66?
Drive gently and only to a workshop. With P0C66 the car can go into limp mode (reduced power) to protect itself.
Will P0C66 fail an emissions test?
Yes, it can. P0C66 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 P0C66 to fix?
Difficulty: workshop only. A typical repair takes 1 to 10 hours of work. This is a job for a workshop.
Will P0C66 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.