P0EF2 code meaning
Drive Motor C Temperature Sensor Range/Performance
Powertrain system Generic code P0Exx codes Check engine light
What P0EF2 means
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.
P0EF2 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 6 hours
- Clears after repairAfter a drive cycle
Symptoms of P0EF2
- 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
Common causes of P0EF2
- Most likelyThermistor characteristic drifted with age
- PossibleSensor no longer in thermal contact with the winding
- PossibleCorroded pin adding resistance and shifting the reading
- Less likelyComparison sensor such as coolant or oil temperature reading wrong
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Drive motor c temp sensorWiring harnessHybrid control module
What each part of P0EF2 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| F2 | The exact fault in that area. |
What to do next
- Note P0EF2 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 P0EF2
What does P0EF2 mean?
P0EF2 means "Drive Motor C Temperature Sensor Range/Performance". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0EF2?
Drive gently and only to a workshop. With P0EF2 the car can go into limp mode (reduced power) to protect itself.
Will P0EF2 fail an emissions test?
Yes, it can. P0EF2 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 P0EF2 to fix?
Difficulty: hard. A typical repair takes 0.5 to 6 hours of work. This is a job for a workshop.
Will P0EF2 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.