P0EF2Drive Motor C Temperature Sensor Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0EF2 flags a plausibility error of the drive motor C temperature sensor: its signal is electrically fine, yet the value does not fit what the controller expects. No manufacturer documents P0EF2 publicly. GM shows a typical check for drive motor B on the 2016 Cadillac ELR: after at least 21,600 s with the propulsion system inactive, the motor thermistor may differ by no more than 20 °C from the average of power electronics coolant and transmission fluid temperature, otherwise P0A31 sets as Type A. Ford compares motor coil, generator coil and transmission fluid temperatures on its 2019 hybrids after 200 minutes key-off, with limits of 10 °C and 30 °C. A drifting thermistor, a sensor that has lost contact with the winding or a high-resistance connection fails such a cold-start comparison.
- What you may notice
- Warning lamp after a long standstill, often at the first start of the day
- Usually no noticeable drivability change at first
- Power limitation of motor C in some cases
- Likely causes
- LikelyThermistor characteristic drifted with age
- PossibleSensor no longer in thermal contact with the winding
- PossibleCorroded pin adding resistance and shifting the reading
- RareComparison sensor such as coolant or oil temperature reading wrong
- 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 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.