Powertrain, generic (extended)

P27DA Pressure Control Solenoid T Stuck On

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P27DA marks solenoid T as delivering pressure while it should be vented. Ford lists it in the 2024 overview for the TR9070 for a selector pilot valve whose hydraulic output stays on; neighbouring entries P178C and P178A cover the selector valve and the complete selector mechanism stuck on. Ford gives no detection limits. For comparison, GM detects the same fault on the Corvette selector pilot valve (code P282A, 23OBDG07) during a synchronizer integrity routine: small test movements of the rods show whether the selector sits in the opposite position to the one commanded, and a current-profile check of the pilot valve separates it from the selector spool. A selector locked in one position sends shifts to the wrong rods, so the TCM blocks gears.

Likely causes

Selector pilot valve held open by dirt
Worn seat or armature in solenoid T
Abrasion particles from clutch or synchronizer wear

Symptoms

  • MIL on
  • Gears locked out, wrong gear engagement possible
  • Fallback mode

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€300–2,500
Time2–8 h

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

Parts involved

pressure control solenoid tvalve body

Related codes

P27D9P27DFP27E0P282A

References: law.cornell.edu, fordservicecontent.com, gsi.ext.gm.com.