P28F5Engine Disconnect Clutch Pressure Sensor Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P28F5 covers a pressure signal from the engine disconnect clutch that jumps, drops out briefly or changes faster than the hydraulics physically allow. Each sample may sit inside the valid band, but the pattern points to a loose contact, a wire that breaks under vibration or heat, or an unstable sensor. No manufacturer documents P28F5 publicly. Ford's bulletin for the 10R80 hybrid gearbox shows that this sensor sits on the outside of the clutch circuit with its own seal and fasteners; a loose fit there leaks fluid and can also disturb the connector. CARB requires checks for erratic input signals. In contrast to P28F2, which concerns a steady but implausible value, P28F5 is about an unsteady one. The driver may notice sporadic warnings and uneven engine engagement.
- What you may notice
- Hybrid warning that comes and goes
- Occasional jerk when the engine is coupled in
- Fluid seepage at the sensor in some cases
- Likely causes
- LikelyLoose or corroded terminal in the sensor or transmission connector
- PossibleHarness wire breaking intermittently under vibration or heat
- PossibleSensor loose on its mounting or internally unstable
- 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: €80 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.