P0C05 code meaning
Drive Motor A Phase U-V-W Circuit/Open
Powertrain system Generic code P0Cxx codes Check engine light
What P0C05 means
P0C05 detects an open or missing phase between the inverter and drive motor A. GM checks each phase as the rotor passes its axis: if the peak phase axis current stays below 9 A while at least 23 A is commanded, with the rotor within 30 degrees of that axis and over 35 V on the inverter, about 200 failed samples set the code. It is Type A, one trip, on the Volt and two-mode trucks and Type B, two trips, on eAssist. Jeep lists it on the 2018/19 Wrangler eTorque with P0C01, curing it by software or a new motor generator unit. Volvo uses it in the rear axle inverter of 2020 to 2022 PHEVs and advises clearing it and test-driving before replacing parts. Expect reduced electric power.
P0C05 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0C05
- Propulsion system performance message or warning lamp
- Reduced electric drive power
- Loss of 12 V charging or noise from the motor generator on mild hybrids
Common causes of P0C05
- Most likelyLoose or open three-phase terminal between inverter and motor A
- PossibleSoftware fault, cured by update (Jeep TSB 08-144-23)
- PossibleInternal fault of the motor generator unit or open stator winding
- Less likelyOne-off event that does not return after clearing (Volvo TJ 36863)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Drive motor a phase uvwDrive motor a inverter
What each part of P0C05 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. |
| 05 | The exact fault in that area. |
What to do next
- Note P0C05 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 P0C05
What does P0C05 mean?
P0C05 means "Drive Motor A Phase U-V-W Circuit/Open". P0C05 detects an open or missing phase between the inverter and drive motor A. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C05?
Drive gently and only to a workshop. With P0C05 the car can go into limp mode (reduced power) to protect itself.
Will P0C05 fail an emissions test?
Yes, it can. P0C05 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 P0C05 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 8 hours of work. This is a job for a workshop.
Will P0C05 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.