Powertrain, generic (extended)

P27CA Pressure Control Solenoid R Stuck On

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P27CA is the stuck-on fault of solenoid R, GM's shift solenoid 4 on the Corvette dual-clutch transmission. The detection in 23OBDG07 mirrors that of valve 3 because both valves share rods 3 and 4, only with opposite pushing direction: a selector change followed by an uncommanded jump of one rod of at least 1 mm inside 200 ms plus a 0.125 mm relaxation of its partner points to valve 4 holding pressure. The check runs continuously, rated Type A, and is retained in 24OBDG07. Ford pairs the code with SPV4 of the TR9070. A valve that cannot vent tends to leave a rod loaded, which may show up as gear grinding or a protective lock-out of gears.

Likely causes

Spool of solenoid R jammed open

Debris lodged in valve R preventing venting

Internal wear of solenoid R armature or seat

Symptoms

MIL on
Grinding or clunk when changing gears
Gears locked out by the controller

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 rvalve body

Related codes

P27C9 P27D0 P27C2 P27D2 P27BA P08C5

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