P0EF1

Drive Motor C Temperature Sensor Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Check Engine light comes on
Hybrid system power reduction
Motor overheating
Unstable operation of the hybrid system
Increased fuel consumption

Causes

Engine temperature sensor fault C
Open or short circuit in the sensor circuit
Poor contact in the sensor connector
Wiring harness damage
Problems with the hybrid system control unit

How to Fix

Check the integrity of the temperature sensor
Check the condition of the wiring and connectors
Measure sensor resistance
Check the sensor signal using an oscilloscope
Replace the faulty sensor or repair the wiring

Related codes

P0EF0 P0EF2 P0EF3