Powertrain, generic (extended)

P287D Electric/Auxiliary Transmission Fluid Pump Motor Torque Out Of Range

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P287D means the motor of the electric auxiliary transmission pump produces a torque outside its expected band, as estimated by the pump controller from phase current and speed. Too little torque hints at a pump that runs dry or draws air; too much hints at a dragging rotor, cold thick fluid or a blocked passage. No manufacturer documents P287D publicly; the duty to monitor the pump stems from CARB 13 CCR 1968.2. Neighbouring cases set the scene: Ford's TSB 17-2056 has the 2016 F-150 2.7L with start-stop store P0C2A when its auxiliary pump does not run, and FCA lists P2797, pump performance, for the Pacifica plug-in hybrid. Because the pump keeps clutches filled while the engine is stopped, a fault often disables start-stop or causes a harsh engagement on restart.

Likely causes

Low fluid or air drawn into the auxiliary pump
Dragging pump rotor or blocked suction or delivery path
Worn pump motor or faulty integrated controller
Control software needing an update

Symptoms

  • Start-stop or electric drive no longer available
  • Harsh engagement after engine restart
  • MIL on

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

aux trans pump apump motortransmission fluid

Related codes

P2797P0C2AP0C28P0C27P2796

References: law.cornell.edu, static.nhtsa.gov, static.nhtsa.gov.