P26CCEngine Coolant Pump Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- 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.
- What you may notice
- Check engine lamp on after a cold start
- Poor cabin heating or rising engine temperature
- Likely causes
- LikelyMoisture inside the pump relay freezing in cold weather
- PossiblePump control or supply wire shorted to ground
- RareBlown fuse or poor supply to the relay
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €20 – €1,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.