Powertrain, generic (extended)

P27DF Pressure Control Solenoid T Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P27DF points to a control line of solenoid T pulled too low. In Ford's 2024 OBD summary it is the shorted-switch fault of the selector pilot valve on the TR9070 dual-clutch gearbox, meaning the switched side of the coil is tied to ground and the valve can be powered permanently. Ford publishes no thresholds. GM's equivalent test on the Corvette selector pilot valve (P282F in 23OBDG07) flags a sense voltage below roughly 1.7 V for 100 ms while the output is on. A permanently applied pilot valve holds the selector in its working position, so the shift valves keep acting on the same rods and the controller has to fence off gears. Inspect for insulation damage and a coil shorted to ground.

Likely causes

Damaged insulation letting the wire touch ground
Solenoid T coil shorted to ground
TCM output switch stuck conducting

Symptoms

  • MIL on
  • Gears fenced off, shifts limited to some gears
  • Limp mode

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–900
Time1–4 h

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

Parts involved

pressure control solenoid twiring harness

Related codes

P27E0P27DDP27DEP27DAP282F

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