Powertrain, generic (extended)

P2D26 Coolant Pump E Control Circuit Performance/Stuck Off

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2D26 belongs to the general auxiliary coolant pumps, not to the motor electronics family above: pump E is the fifth electric pump of a vehicle, and its assignment (low-temperature loop, charge air cooler, turbo or component cooling) depends entirely on the manufacturer. The code says the control circuit is intact but the pump does not run or does not deliver the expected effect. No manufacturer publicly documents P2D26. GM's diesel tables show the method on pump C (P2C48): they compute the phase current expected at the measured speed and set a type B fault after about 5 s outside the window. Ford's 2024 summary handles performance/stuck off (fault type 92) for its pumps continuously above 11 V. A seized rotor, air, a weak motor or wiring resistance are typical. Electrical faults on pump E have their own codes from P2DF4.

Likely causes

Pump E seized or mechanically worn so it does not reach its target
Air or low coolant in the loop served by pump E
High resistance in connector, feed or ground of pump E
Control module software requiring an update

Symptoms

  • Malfunction indicator lamp on
  • Higher temperature in the circuit cooled by pump E
  • Possible reduced power, depending on what pump E cools

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–900
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

P2D27P2DF4P2DF8P2DF9P2C48P2C49

References: law.cornell.edu, gsi.ext.gm.com, fordservicecontent.com.