P0EF5Drive Motor C Temperature Sensor Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0EF5 covers a drive motor C temperature signal that jumps or drops out for short moments instead of staying wrong. Because of the thermal mass of a traction motor, the winding temperature can only change slowly; a step of many degrees within milliseconds therefore points to the wiring and not to the motor. Loose or corroded pins at the motor connector, leads chafing near moving parts or a cracked sensor lead are typical. No manufacturer documents P0EF5 publicly, and its drive motor A and B siblings P0A2E and P0A34 are not listed in the published Ford and GM tables either; Ford only runs open and short checks on its coil sensors with a 200 ms monitoring window. CARB requires hybrid systems to watch electric motor performance. Warnings that appear and vanish, sometimes with brief power cuts, are typical.
- What you may notice
- Warning lamp that comes and goes
- Short power interruptions of motor C, often on rough roads
- Jumping motor temperature in the live data
- Likely causes
- LikelyLoose or corroded pins in the motor connector
- PossibleHarness chafing at brackets or moving parts
- RareCracked sensor lead inside the motor that opens with vibration or heat
- 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 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.