P2DF9Coolant Pump E Stuck/Stalled
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2DF9 covers the hard case: coolant pump E is powered and commanded, but its rotor does not start or comes to a standstill. Brushless pumps sense this internally, for instance from current flowing without commutation feedback, and pass the result to the commanding module. No manufacturer documents P2DF9 publicly. In Ford's 2024 gasoline document the matching entry for pumps A and B is fault type 71, a stuck actuator, watched without interruption from 11 V. A GM patent on electric coolant pump diagnostics compares measured pump current with a value expected from speed, coolant temperature and valve positions, and flags a flow fault when either current or speed deviates too far. Seized bearings, a jammed impeller, frozen or sludged coolant and a burnt winding are typical. Slow but turning is P2DF8.
- What you may notice
- Warning lamp on
- No coolant flow in the affected circuit
- Overheating warning or power limitation
- Likely causes
- LikelySeized bearing or impeller jammed by debris
- PossibleFrozen, gelled or sludged coolant (wrong mixture)
- PossibleBurnt winding or failed pump electronics
- RareRotor stuck after long standstill, deposits on the bearing
- 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: €100 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.