P28F1Engine Disconnect Clutch Pressure Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- A hydraulically applied disconnect clutch often has its own pressure sensor so the controller knows how firmly the clutch is held. Ford fits one to the 10R80 modular hybrid transmission of the 2021 Explorer, Aviator and F-150 hybrids; a Ford bulletin covers fluid seeping out at this sensor because its fasteners worked loose, fixed by retightening them. P28F1 is the general electrical fault of that sensor circuit, used when the module cannot tell low from high, typically an open signal, supply or ground wire or a connector that has lost contact. No manufacturer ties P28F1 to a threshold in public. CARB requires circuit checks on such inputs. Without a valid reading the clutch is run on a model or locked open, so the engine may stay off or engagement turns harsh.
- What you may notice
- Hybrid or transmission warning light
- Engine stays off or engages harshly when it should join in
- Possible fluid wetness around the sensor
- Likely causes
- LikelySensor connector loose, corroded or with a pushed-back terminal
- PossibleSignal, reference or ground wire of the sensor broken
- PossiblePressure sensor electronics failed, possibly after fluid ingress at a leaking seal
- RareSensor input of the transmission or hybrid control module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.