Powertrain, generic (extended)

P27D5 Pressure Control Solenoid S Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P27D5 stands for an interrupted control circuit of solenoid S. GM uses it for synchronizer actuation valve 5 in the Corvette DCT, documented in 23OBDG07 and again in 24OBDG07. While the low-side output is off, a working coil pulls the sense pin up to supply voltage; the driver chip then tries to hold that pin low with a tiny current. If it manages to, the pin settles at roughly 1.7 V to 3 V, and after 150 ms this counts as open load, Type A with MIL. The test only runs between 8.75 and 18 V supply, not during cranking, and is suppressed when P0882 or P0883 is present. Ford's TR9070 has no valve S. With valve 5 dead, rod 5 cannot be moved and its gears drop out.

Likely causes

Terminal pushed back in the gearbox connector
Open winding in solenoid S
Broken control wire between TCM and valve

Symptoms

  • MIL on
  • Gears on rod 5 missing
  • Emergency program

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 swiring harness

Related codes

P27D7P27D8P27D6P27D3P27D1P27CD

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