Powertrain, generic (extended)

P27D9 Pressure Control Solenoid T Performance/Stuck Off

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P27D9 is logged when solenoid T fails to build the pressure it is asked for. Ford's 2024 OBD overview for the TR9070 dual-clutch gearbox assigns it to the selector pilot valve (SELPV) when that valve stays hydraulically off. That pilot valve moves the selector valve, which decides which shift rods the synchronizer valves SPV1 to SPV4 act on; Ford keeps separate codes for the selector valve and the whole selector mechanism (P178D, P178B). No thresholds are published. GM's Corvette dual-clutch box has the same kind of valve but files its stuck-off fault under P2829, not P27D9. If the selector cannot switch, part of the gear set is unreachable. Fluid level, contamination and the pilot valve itself are the first checks.

Likely causes

Selector pilot valve stuck closed
Low or contaminated transmission fluid
Selector valve spool binding in its bore

Symptoms

  • MIL on
  • Several gears unavailable
  • Gearbox in 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

P27DAP27DDP27DFP27E0P2829

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