P2DF4Coolant Pump E Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Electric coolant pumps are usually commanded through a PWM wire or a LIN bus, and pump E is the fifth such pump in a vehicle's lettering; what it cools depends on the manufacturer. P2DF4 reports an open or otherwise faulty command line to pump E. No manufacturer documents P2DF4 publicly. Ford shows the pattern for its pumps A and B in the 2024 gasoline OBD summary: the base code is fault type 13 (circuit open), set when the module's smart driver reports an output fault, monitored continuously above 11 V over 5 seconds. Bosch's PDE pump, a typical example, carries its own motor and diagnostic electronics and takes speed commands via PWM or LIN. With an open line many pumps default to a fixed speed or stop, so the cooled component may overheat. Shorts are P2DF5 and P2DF6.
- What you may notice
- Warning lamp on
- Pump runs at fixed speed or not at all
- Temperature warning or power reduction of the cooled component
- Likely causes
- LikelyPump connector loose, corroded or with pushed-back pin
- PossibleBroken command wire in the harness
- PossiblePump electronics with failed control input
- RareFaulty output driver in the commanding module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.