P0EF3 code meaning
Drive Motor C Temperature Sensor Circuit Low
Powertrain system Generic code P0Exx codes Check engine light
What P0EF3 means
P0EF3 is stored when the signal voltage of the drive motor C temperature sensor drops below its valid range. With the usual NTC thermistor on a pull-up resistor, a low voltage stands for an extremely hot winding, so electrically the suspects are a short to ground, a pinched harness or a sensor with an internal short. No manufacturer documents P0EF3 publicly. GM's motor B table for the 2016 Cadillac ELR shows the analogous limit: P0A32 trips once the reading corresponds to more than 184 °C, close to 0 V, after a 90 s warm-up, Type A. Ford's 2019 hybrids fail the motor coil sensor below 0.1 V held for 32 ms. Because the controller cannot tell such a short from real overheating, it derates motor C. P0EF4 covers the high-voltage side.
P0EF3 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0EF3
- Drive power of motor C reduced immediately
- Implausibly high motor temperature in the live data
- Warning lamp on
Common causes of P0EF3
- Most likelySignal wire shorted to ground or motor housing
- PossibleThermistor shorted internally
- PossibleWater or coolant in the connector bridging the pins
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 P0EF3 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| F3 | The exact fault in that area. |
What to do next
- Note P0EF3 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 P0EF3
What does P0EF3 mean?
P0EF3 means "Drive Motor C Temperature Sensor Circuit Low". P0EF3 is stored when the signal voltage of the drive motor C temperature sensor drops below its valid range. It is a generic code, so it means the same on every make.
Is it safe to drive with P0EF3?
Drive gently and only to a workshop. With P0EF3 the car can go into limp mode (reduced power) to protect itself.
Will P0EF3 fail an emissions test?
Yes, it can. P0EF3 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 P0EF3 to fix?
Difficulty: hard. A typical repair takes 0.5 to 6 hours of work. This is a job for a workshop.
Will P0EF3 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.