Powertrain, generic (extended)

P26CC Engine Coolant Pump Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P26CC reports that the circuit controlling the engine coolant pump stays at too low a voltage while the pump should be active. Honda uses the code on its two-motor hybrids and calls it a low voltage in the circuit of the electric pump: service bulletin 25-020 (Accord and CR-V Hybrid 2023–2024, Civic Hybrid 2025) explains that moisture in the pump relay can freeze at or below 0 °C, the relay then fails to switch, the MIL comes on and P26CC is stored as soon as the car is started cold. The fix is a revised relay, after checking the intake air temperature in the freeze frame. Under CARB's OBD rule, output components need a circuit check. Other causes are a short to ground or a missing supply. While the pump does not run, the engine warms up unevenly.

Likely causes

Moisture inside the pump relay freezing in cold weather
Pump control or supply wire shorted to ground
Blown fuse or poor supply to the relay

Symptoms

  • Check engine lamp on after a cold start
  • Poor cabin heating or rising engine temperature

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–1,000
Time0.2–2.5 h

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

Parts involved

engine coolant pumppump relaywiring harness

Related codes

P26CAP26CDP2602P26D4

References: static.nhtsa.gov, law.cornell.edu.