P2DF6Coolant Pump E Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2DF6 is set when the command line of coolant pump E stays high although the module wants it low, most often because it touches a battery-voltage wire. No manufacturer documents P2DF6 publicly. For pumps A and B, Ford's 2024 gasoline document assigns fault type 12 (circuit high), raised by the smart driver once battery voltage reaches 11 V. A PWM line pinned high looks like a constant full command, so many pumps run at maximum speed regardless of the actual cooling need; this drains extra current and may disturb warm-up or cooling strategies. A short inside the pump electronics can cause the same picture. Check the harness for contact with feed wires and measure the line with the pump unplugged. Low-side faults are P2DF5, an open line P2DF4.
- What you may notice
- Warning lamp on
- Pump audible at full speed all the time
- Slower warm-up of the affected loop
- Likely causes
- LikelyCommand wire shorted to a battery-voltage wire
- PossibleInternal fault in the pump electronics pulling the line high
- PossibleCorrosion bridging adjacent pins in the connector
- RareCommanding module's output stage stuck high
- 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.