Powertrain, generic (extended)

P27D1 Pressure Control Solenoid S Performance/Stuck Off

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P27D1 flags pressure control solenoid S as unable to produce force. Only GM documents it publicly: in the Corvette dual-clutch tables 23OBDG07 and 24OBDG07 it is shift solenoid 5, the only one of these valves serving a single rod, rod 5, which it moves in both directions depending on the selector position. If the intrusive integrity routine sees 100 µm or less of travel on rod 5 while valve 5 is applied, the fault is stored as Type A. Ford's TR9070 has just four synchronizer valves, so the code does not appear there. Gears carried on rod 5 become unavailable; fluid condition, a sticking spool or a leak in the rod actuator are the first things to check.

Likely causes

Spool of solenoid S sticking closed
Low or worn-out transmission fluid
Leak at the rod 5 actuator piston

Symptoms

  • MIL on
  • Gears on rod 5 unavailable
  • Gearbox in substitute 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 svalve body

Related codes

P27D2P27D3P27D5P27C1P27C9

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