P0C14Drive Motor B Inverter Phase U Over Temperature
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Malfunction indicator lamp after one drive
- Reduced propulsion power, especially under load
- Hybrid system overheat message
- Likely causes
- LikelyLow coolant level or air in the power electronics cooling loop
- LikelyFailed electric coolant pump of the inverter loop
- PossibleClogged low-temperature radiator or failed cooling fan
- RareLong periods of high load on motor B, e.g. towing or steep climbs
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €50 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.