Powertrain, generic (extended)

P285D Shift Fork A Actuator Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P285D points to a fork A actuator line pulled toward ground: a chafed motor phase touching the case, water in the connector, or a short inside the motor. To protect its driver, the module normally shuts the output down at once. In Ford's 2012 OBD summary for the DPS6 gearbox this exact fault, a short to ground on the shift drum A motor, carries P285D; the MIL is requested, as Ford's 2014 code catalogue confirms. That drum handles 1st, 3rd and 5th. Ford keeps the open circuit (P285B) and the short to battery voltage (P285E) separate, and a fault of the motor driver chip itself appears as P2831. A grounded phase can also blow the module's driver, so the wiring should be checked before a replacement module is fitted.

Likely causes

Actuator motor lead chafed through against the transmission case
Water or corrosion in the actuator connector
Internal short of a motor winding to its housing

Symptoms

  • Engine lamp on, odd gears locked out
  • Car starts in second gear or will not move off
  • Code returns immediately after clearing

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

P285BP285EP285CP2861P2831

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