P0E4FMotor Electronics Coolant Pump A Control Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0E4F covers coolant pump A of the motor electronics loop, which cools the inverter and drive motor, and sets when the signal exchanged with the pump becomes unstable rather than permanently open or shorted. Ford uses exactly this code in the OBD summaries for its hybrid and plug-in hybrid models of 2015 to 2019: the pump reports back to the module, and P0E4F is stored when that feedback is outside the expected frequency or duty cycle for more than 1 s. The check runs continuously from 500 ms after power-up with 6 to 19 V on the 12 V network, next to P0A05 (no response for over 9.25 s), P0A06 and P0A07 (driver faults) and P0C73 (pump reports an internal fault). Loose pins or moisture in the pump connector are typical; overheat protection may cut power.
- What you may notice
- MIL or hybrid system warning
- Power reduction when inverter or motor temperature rises
- Fault may clear itself and return later
- Likely causes
- LikelyLoose, corroded or wet pins in the pump A connector
- PossibleChafed command or feedback wire that loses contact intermittently
- PossibleFailing electronics inside the pump sending an unstable feedback signal
- RareUnstable 12 V supply or poor ground at the pump
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.