Powertrain, generic (extended)

P26F5 Coolant Pump C Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P26F5 reports that the control circuit of coolant pump C is pulled too low. Bentley documents the code in the engine electronics of the Continental GT/GTC and Flying Spur. Bulletin 2058340/1 (Continental 2018–2019, cars without parking heater) blames internal corrosion of the additional coolant pump that shorts it out; cars built before 15 July 2019 get a pump from another supplier together with a new bracket. Bulletins 2078799/1 to /3 (2024 V8 models) describe the code as intermittent and caused by over-sensitive self-diagnosis of the heater auxiliary pump; after checking the wiring for corrosion and coolant ingress the pump is replaced, and Bentley states that heating and engine are not affected. In both cases the MIL is lit, so the code is emission-related despite the harmless symptom.

Likely causes

Internal corrosion of the pump causing a short circuit
Over-sensitive internal diagnosis of the pump (known pump part number)
Control wire shorted to ground or coolant in the connector

Symptoms

  • Check engine light on
  • Often no noticeable change in heating or engine behaviour
  • Fault may come and go (stored as intermittent)

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€150–800
Time0.8–2.5 h

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

Parts involved

coolant pump cwiring harness

Related codes

P26F4P26F6P2C48

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.