Powertrain, generic (extended)

P2DF6 Coolant Pump E Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Command wire shorted to a battery-voltage wire
Internal fault in the pump electronics pulling the line high
Corrosion bridging adjacent pins in the connector
Commanding module's output stage stuck high

Symptoms

  • Warning lamp on
  • Pump audible at full speed all the time
  • Slower warm-up of the affected loop

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–600
Time0.3–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

coolant pump ewiring harnessecm

Related codes

P2DF4P2DF5P2DFAP2DF7

References: fordservicecontent.com, law.cornell.edu, bosch-mobility.com.