P26DAEngine Coolant Pump Clutch Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P26DA is the high-side counterpart of P26D9: the control line of the coolant pump clutch shows more voltage than the commanded state permits, for instance while the driver should be pulling it low or while it is switched off. Typical causes are a wire rubbing against a live circuit, a missing ground at the clutch so the line floats up, or an open coil that the driver reads as high. None of the carmakers explains P26DA in public sources. CARB requires circuit monitoring for electronic parts that regulate engine coolant temperature, and Ford's OBD summaries confirm that clutched pumps are used on some applications. If the line is held at supply voltage the clutch may be stuck in one state; unlike P26D9 a fuse rarely blows. The MIL comes on and warm-up or cooling behaviour can change.
- What you may notice
- Check engine light on
- Pump clutch does not switch, warm-up or cooling behaves differently
- Likely causes
- LikelyControl wire shorted to a battery-voltage circuit
- PossibleOpen ground or poor ground contact at 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.