Powertrain, generic (extended)

P27C2 Pressure Control Solenoid P Stuck On

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P27C2 means solenoid P keeps pressurizing after it should have vented. GM's dual-clutch Corvette table 23OBDG07 (and 24OBDG07) detects this on shift solenoid 3 by watching what happens just after the selector valve switches: if one of rods 3 and 4 travels 1,000 µm or more within 200 ms without a command while the other one drops back by at least 125 µm, valve 3 is judged hydraulically stuck on, Type A. Which rod moves and which relaxes depends on the selector position. Ford's 2024 overview gives P27C2 to SPV3 on the TR9070. Unwanted rod motion can drag a gear in, so the controller usually blocks the affected gears; clunks or a sudden neutral are possible.

Likely causes

Spool of solenoid P jammed in the open (pressure-applying) position
Wear particles in the fluid keeping the valve from closing
Worn valve bore letting pressure bypass to the actuator

Symptoms

  • MIL on and gears blocked by the controller
  • Clunk or grinding during gear changes
  • Unexpected loss of drive (neutral)

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 pvalve body

Related codes

P27C1P27C8P27CAP27D2P27BAP08C5

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