Powertrain, generic (extended)

P2DF9 Coolant Pump E Stuck/Stalled

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2DF9 covers the hard case: coolant pump E is powered and commanded, but its rotor does not start or comes to a standstill. Brushless pumps sense this internally, for instance from current flowing without commutation feedback, and pass the result to the commanding module. No manufacturer documents P2DF9 publicly. In Ford's 2024 gasoline document the matching entry for pumps A and B is fault type 71, a stuck actuator, watched without interruption from 11 V. A GM patent on electric coolant pump diagnostics compares measured pump current with a value expected from speed, coolant temperature and valve positions, and flags a flow fault when either current or speed deviates too far. Seized bearings, a jammed impeller, frozen or sludged coolant and a burnt winding are typical. Slow but turning is P2DF8.

Likely causes

Seized bearing or impeller jammed by debris
Frozen, gelled or sludged coolant (wrong mixture)
Burnt winding or failed pump electronics
Rotor stuck after long standstill, deposits on the bearing

Symptoms

  • Warning lamp on
  • No coolant flow in the affected circuit
  • Overheating warning or power limitation

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–800
Time0.5–3 h

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

Parts involved

coolant pump ewiring harnessecm

Related codes

P2DF8P2DF7P2DFBP2D26

References: fordservicecontent.com, image-ppubs.uspto.gov, law.cornell.edu.