Powertrain, generic (extended)

P285E Shift Fork A Actuator Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P285E is logged when a line of the fork A actuator carries supply voltage where the module expects it to be switched low. Usual explanations are a harness short to a battery-fed wire or a low-side transistor in the module that no longer turns on; with some driver designs, an unloaded output can also read high. Ford names the code for its 2012 DPS6 dual-clutch unit as the short-to-power fault of the shift drum A motor, the drive that sets the forks for gears 1, 3 and 5, and lists it as a MIL code in its 2014 catalogue. The low-side companion is P285D, the open circuit P285B. Because a phase stuck at battery potential prevents controlled rotation, the module stops the motor and leaves the odd gears unavailable until the short is cleared.

Likely causes

Actuator lead shorted to a battery-fed wire in the harness
Low-side driver in the transmission module not switching
Bridged pins in the actuator or module connector

Symptoms

  • Engine lamp lit, gears 1, 3 and 5 unavailable
  • Gearbox stays in an even gear or neutral

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,500
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

shift fork actuator awiring harnesstcm

Related codes

P285BP285DP285CP2862P2831

References: newtonnet.co.uk, performanceparts.ford.com, law.cornell.edu.