Powertrain, generic (extended)

P26CB Engine Coolant Pump Performance/Stuck Off

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P26CB means the engine coolant pump does not deliver the expected work, typically because the impeller is blocked or turns too slowly. Ford's OBD summaries for hybrids let the pump's own electronics judge this from current and speed: too much current at too low a speed through four restart attempts is reported over LIN, and the PCM records P26CB after five seconds. Genesis campaign 916G (GV70 3.5 T, 2024–2025) replaces the electric pump of the water-cooled charge air cooler because a stuck impeller set P26CB. Jaguar Land Rover bulletin JLRTB02030NAS1 links it on Ingenium 2.0 L petrol engines to a switchable mechanical pump whose diverter shroud no longer moves, making the fans run at full speed. Toyota's A25A engines log it as speed stuck. Overheating protection may cut power.

Likely causes

Seized or obstructed impeller in the electric pump
Diverter shroud of a switchable mechanical pump not moving
Worn pump motor or bearing drawing excessive current
Engine module logic needing a software update

Symptoms

  • Check engine lamp on
  • Cooling fans running constantly at high speed
  • Rising engine temperature or reduced power

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–1,500
Time0.3–4 h

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

Parts involved

engine coolant pumppump motor

Related codes

P26CAP26CEP26D2P2601P0217

References: fordservicecontent.com, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.