P26D9Engine Coolant Pump Clutch Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P26D9 narrows the electrical fault of the coolant pump clutch down to a control line that sits too close to ground. The output stage in the engine module notices that the voltage on the line stays low when it should be high, which almost always points to a chafed wire touching the engine block or body, a coil with shorted turns, or water in a connector near the pump. There is no published manufacturer description of P26D9. CARB's rule asks for circuit checks on electronic components that influence coolant temperature control, and Ford names clutched water pumps as one such design. Because the solenoid can no longer be switched, the clutch remains in whatever state its springs or magnets give it without current; the driver mostly notices a lit MIL and a changed warm-up, while the short may also blow a shared fuse.
- What you may notice
- Check engine light on
- Changed warm-up behaviour of the engine
- Possibly a blown fuse with further faults on the same circuit
- Likely causes
- LikelyChafed control wire shorted to ground
- PossibleClutch solenoid with shorted windings
- PossibleMoisture or coolant in the connector at the pump
- 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.