P2DF7Coolant Pump E Overspeed/Air in System
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- When an electric pump draws air instead of liquid, its impeller loses load and the rotor races above the commanded speed. P2DF7 reports this for coolant pump E; the title already names trapped air as the usual cause. No manufacturer documents P2DF7 publicly. Ford names the condition overspeed or dry run and codes it B1 for the cabin-heating and component-cooling pumps in its 2024 gasoline summary, checked whenever the battery delivers 11 V or more. GM's 2025 ECM tables show how overspeed is judged on the electric main pump (P26CE): the filtered difference between requested and actual speed turns negative beyond a calibrated limit for 8 of 10 seconds, Type B. Typical triggers are a low coolant level, an incomplete bleed after service, or a leak that sucks in air. Running dry also heats the pump electronics, see P2DFB.
- What you may notice
- Warning lamp or coolant level message
- Gurgling or whining from the pump area
- Overheating or derating of the cooled component
- Likely causes
- LikelyAir pocket left after coolant service or component replacement
- LikelyLow coolant level from a leak in the loop
- RareDamaged or loose impeller, rotor spins freely
- RareImplausible speed feedback from the pump electronics
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €20 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.