P27D4Pressure Control Solenoid S Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P27D4 means the controller noticed solenoid S dropping out now and then, electrically or in its effect, without the fault staying present. No manufacturer publishes this code. GM, whose Corvette dual-clutch gearbox has a fifth synchronizer valve for rod 5 (tables 23OBDG07 and 24OBDG07), reports lasting wiring faults on it as P27D5, P27D7 and P27D8 and its stuck states as P27D1 and P27D2; a separate sporadic code is not listed there. CARB 13 CCR 1968.2 still requires transmission actuators to be monitored. For the driver it can mean an occasional refusal of the rod 5 gears. Wiggle-test the harness with the engine running, inspect the gearbox connector seal and check whether the fault follows heat.
- What you may notice
- MIL comes and goes
- Rod 5 gears occasionally refused
- Likely causes
- LikelyGearbox connector seal leaking, terminals corroding
- PossibleHarness conductor breaking under engine movement
- RareSolenoid S winding dropping out when hot
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.