P285FShift Fork B Actuator Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- With P285F the module reports that the drive circuit of the fork B actuator is open: current cannot flow when the motor or valve is energised. In Ford's DPS6 dual-clutch box, the second shift drum is turned by its own three-phase motor and places the forks for reverse plus 2nd, 4th and 6th; an open motor circuit there is P285F and requests the MIL. The 2012 Ford summary prints that paragraph under the heading of drum A again, but its codes and gear list clearly belong to drum B. Further checks on the same motor are P2836 for the driver chip, P283A for the hall pattern and P2837 when the drum position becomes unreliable. A car with P285F usually loses reverse and the even gears, so manoeuvring may become impossible.
- What you may notice
- No reverse gear, even gears missing
- Engine lamp and gearbox fault message
- Car drives only in 1st, 3rd and 5th with large rpm steps
- Likely causes
- LikelyFork B actuator connector loose or with spread terminals
- PossibleOpen wire in the harness to the fork B actuator
- PossibleBurnt or broken winding in the fork B motor
- 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 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.