Powertrain, generic (extended)

P2DF4 Coolant Pump E Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Pump connector loose, corroded or with pushed-back pin
Broken command wire in the harness
Pump electronics with failed control input
Faulty output driver in the commanding module

Symptoms

  • Warning lamp on
  • Pump runs at fixed speed or not at all
  • Temperature warning or power reduction of the cooled component

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

P2DF5P2DF6P2D26P2DFAU0698

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