P0C15Drive Motor B Inverter Phase V 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
- P0C15 reports overtemperature at phase V of the motor B inverter, based on a sensor reading that is valid but above the limit. GM applies it on the Volt and the two-mode trucks: PIM sensor D above 98 °C on the 2011 Volt, 88 °C on the 2012 trucks, 102.5 °C on the 2016 ELR, 131 °C for 1.2 s within 2 s on the 2016 Volt and in the 2018 table, every time Type A with one trip. It is a protective diagnosis, not a wiring check; the thermistor's own codes P0BD6 and P0BD7 handle sensor faults. Phase U and W are P0C14 and P0C16, phase V on motor A is P0C12. GM bulletin PIC6303A names P0C15 among the overheat codes that call for a cooling diagnosis. Motor B output is restricted.
- What you may notice
- Malfunction indicator lamp after one drive
- Reduced propulsion until the inverter has cooled
- Engine runs more often than usual
- Likely causes
- LikelyCoolant loss or air in the inverter cooling loop
- LikelyElectric coolant pump of the power electronics not working
- PossibleBlocked radiator for the power electronics or fan failure
- RarePoor heat transfer or ageing power stage inside the inverter
- 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.