Powertrain, generic (extended)

P27D2 Pressure Control Solenoid S Stuck On

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

With P27D2 the TCM concludes that solenoid S applies pressure that was never requested. GM is the only maker publishing it, for shift solenoid 5 of the Corvette dual-clutch gearbox (23OBDG07, carried over to 24OBDG07). Because valve 5 serves rod 5 on its own, there is no partner rod to relax; instead the trigger is far larger: rod 5 must drift 4,000 µm or more within 200 ms after the selector valve changes position although its force target is zero. The result is Type A with the MIL. Ford's four-valve TR9070 does not have the code. Expect the gears on rod 5 to be blocked and possibly a harsh engagement or a fallback mode.

Likely causes

Spool of solenoid S jammed open
Particles keeping valve S from venting
Worn armature or seat in solenoid S

Symptoms

  • MIL on
  • Harsh engagement or clunk
  • Gears on rod 5 blocked, 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 svalve body

Related codes

P27D1P27D3P27D8P27C2P27CA

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