P27C1Pressure Control Solenoid P Performance/Stuck Off
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P27C1 is logged when pressure control solenoid P is commanded but the shift rods it serves barely move. In GM's Corvette dual-clutch documentation (23OBDG07, unchanged in 24OBDG07) the part is shift solenoid 3; with the selector valve in one position it pushes rod 3, in the other rod 4, both in the A-to-B direction. During GM's intrusive synchronizer check, run after a shift fault or a gear mismatch found at power-up, travel of 100 µm or less on the commanded rod counts as no response, Type A. Ford's 2024 summary assigns the code to SPV3 of the TR9070. Gears selected via rods 3 and 4 may be locked out and the gearbox may run on a reduced set of ratios.
- What you may notice
- MIL on with transmission warning
- Certain gears skipped or not selectable
- Delayed or failed launch in affected gear
- Likely causes
- LikelyValve spool of solenoid P held in the closed position by debris or varnish
- PossibleLow, aerated or degraded transmission fluid so no pressure builds
- PossibleLeaking seal on the shift rod actuator piston for rods 3/4
- RareMechanically binding shift rod or fork
- 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.