P26D6Engine Coolant Pump Clutch Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Some engines drive their mechanical coolant pump through a switchable clutch: following a cold start the pump is left idle so the coolant stays still and the engine reaches temperature sooner, and once a target is met the clutch couples the pump to its drive again. P26D6 means the engine control module sees the control circuit of this clutch as open – typically a broken wire, a loose connector or a solenoid coil that has burnt through. No manufacturer documents this code in public. Ford's OBD summaries list clutched water pumps among the designs its thermostat monitor has to account for, and CARB demands an approved monitoring plan for any part other than the thermostat that regulates coolant temperature. Many clutches engage on loss of current, so the usual effect is slower warm-up rather than overheating.
- What you may notice
- Check engine light on
- Engine and cabin heater take longer to warm up
- Coolant temperature behaves differently from normal after a cold start
- Likely causes
- LikelyBroken wire or corroded, loose connector in the clutch control circuit
- PossibleOpen solenoid coil in the coolant pump clutch
- RareBlown fuse or missing supply to the clutch solenoid
- RareFaulty output stage in the engine control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.