P0C0E code meaning
Drive Motor B Inverter Power Supply Circuit/Open
Powertrain system Generic code P0Cxx codes Check engine light
What P0C0E means
P0C0E is the motor B counterpart of P0C0B: the inverter for the second motor has lost the supply of its gate-drive board. GM documents it on the Volt and the two-mode trucks. The IGBT module reports a bias fault through its status line when the supply of phase A, B or C fails. The 2011 Volt checks with high voltage above 100 V, the 2012 trucks with run/crank voltage between 9.5 and 18 V, both after one count, Type A. The 2016 Volt needs 0.002 s of fault in a 0.024 s window, the 2018 table 0.02 s, the 2019 table 0.168 s, always Type A, one trip. P0C0F and P0C10 cover low and high supply. Motor B can no longer be driven, so propulsion is reduced.
P0C0E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0C0E
- Malfunction indicator lamp after one drive
- Reduced propulsion message, motor B unavailable
- Engine runs continuously instead of electric driving
Common causes of P0C0E
- Most likelyFailed gate-drive power supply inside the motor B inverter
- PossibleWeak 12 V feed, blown fuse or poor ground at the inverter control board
- Less likelyLoose or corroded low-voltage connector at the power inverter module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Drive motor b inverterWiring harnessHybrid control module
What each part of P0C0E 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. |
| 0E | The exact fault in that area. |
What to do next
- Note P0C0E 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 P0C0E
What does P0C0E mean?
P0C0E means "Drive Motor B Inverter Power Supply Circuit/Open". P0C0E is the motor B counterpart of P0C0B: the inverter for the second motor has lost the supply of its gate-drive board. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C0E?
Drive gently and only to a workshop. With P0C0E the car can go into limp mode (reduced power) to protect itself.
Will P0C0E fail an emissions test?
Yes, it can. P0C0E 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 P0C0E to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 6 hours of work. This is a job for a workshop.
Will P0C0E clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.