P27D7Pressure Control Solenoid S Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P27D7 reports the control line of solenoid S stuck at too low a level, typically a short to ground. GM applies it to synchronizer actuation valve 5 on the Corvette dual-clutch gearbox (23OBDG07, carried into 24OBDG07): with the output switched on, the sense pin should be pulled down only partly; if it drops below roughly 1.7 V and stays there 150 ms, the driver chip flags a ground short and the TCM stores a Type A fault. As the coil is switched on the ground side, a grounded line can leave valve 5 powered without command, pushing rod 5 against the intended gear. Ford's TR9070 does not use solenoid S. Look for chafed insulation near brackets and for a coil shorted to its housing.
- What you may notice
- MIL on
- Unintended rod 5 movement, gears locked
- Limp mode
- Likely causes
- LikelyControl wire chafed through to ground
- PossibleSolenoid S coil shorted to its housing
- RareFaulty low-side driver in the TCM
- 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: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.