P27CAPressure Control Solenoid R Stuck On
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- MIL on
- Grinding or clunk when changing gears
- Gears locked out by the controller
- Likely causes
- LikelySpool of solenoid R jammed open
- PossibleDebris lodged in valve R preventing venting
- RareInternal wear of solenoid R armature or seat
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €300 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.