P0EF1Drive Motor C Temperature Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0EF1 is the general circuit code for the temperature sensor of drive motor C, the third traction motor on vehicles with three or more electric machines. It must not be confused with P2DB1, which means sensor C inside drive motor A. Volvo Trucks lists P0EF1 with failure type 09, component failure, for its electric trucks in remote diagnostic bulletin RD21-022; it names connector, wiring harness, the motor temperature sensor itself and an unsupported configuration as possible causes and sends the technician to Tech Tool for the detailed steps. The general code is used when the fault is not classified as low or high, which have their own codes P0EF3 and P0EF4. Without a usable winding temperature the controller has to protect motor C and limits its output.
- What you may notice
- Reduced drive power
- Warning lamp for the electric drive
- Motor temperature shown as invalid in the scan tool
- Likely causes
- LikelyLoose, corroded or damaged connector of the motor C temperature sensor
- PossibleChafed or broken sensor wiring
- PossibleTemperature sensor in the winding failed
- RareController configuration not matching the installed motor (Volvo RD21-022)
- 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.