P0C14 code meaning
Drive Motor B Inverter Phase U Over Temperature
Powertrain system Generic code P0Cxx codes Check engine light
What P0C14 means
P0C14 is the motor B counterpart of P0C11: phase U of the second inverter has become too hot while its temperature sensor reads plausibly. GM documents it on the Volt and the two-mode trucks. The 2011 Volt compares PIM sensor B with 98 °C, the 2012 trucks use 88 °C with a reset at 85 °C, the 2016 Volt 131 °C for 1.2 s in 2 s and the 2019 table 131 °C for 1.5 s, all Type A, one trip. Sensor circuit codes such as P0AF2 or P0AF3 point to the thermistor instead and are checked first. P0C15 and P0C16 cover phases V and W. GM bulletin PIC6303A sends technicians to the cooling system when inverter overheat codes appear. Power from motor B is limited meanwhile.
P0C14 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0C14
- Malfunction indicator lamp after one drive
- Reduced propulsion power, especially under load
- Hybrid system overheat message
Common causes of P0C14
- Most likelyLow coolant level or air in the power electronics cooling loop
- Most likelyFailed electric coolant pump of the inverter loop
- PossibleClogged low-temperature radiator or failed cooling fan
- Less likelyLong periods of high load on motor B, e.g. towing or steep climbs
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Drive motor b inverter phase u
What each part of P0C14 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. |
| 14 | The exact fault in that area. |
What to do next
- Note P0C14 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 P0C14
What does P0C14 mean?
P0C14 means "Drive Motor B Inverter Phase U Over Temperature". P0C14 is the motor B counterpart of P0C11: phase U of the second inverter has become too hot while its temperature sensor reads plausibly. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C14?
Drive gently and only to a workshop. With P0C14 the car can go into limp mode (reduced power) to protect itself.
Will P0C14 fail an emissions test?
Yes, it can. P0C14 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 P0C14 to fix?
Difficulty: hard. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will P0C14 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.