P27D5Pressure Control Solenoid S Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P27D5 stands for an interrupted control circuit of solenoid S. GM uses it for synchronizer actuation valve 5 in the Corvette DCT, documented in 23OBDG07 and again in 24OBDG07. While the low-side output is off, a working coil pulls the sense pin up to supply voltage; the driver chip then tries to hold that pin low with a tiny current. If it manages to, the pin settles at roughly 1.7 V to 3 V, and after 150 ms this counts as open load, Type A with MIL. The test only runs between 8.75 and 18 V supply, not during cranking, and is suppressed when P0882 or P0883 is present. Ford's TR9070 has no valve S. With valve 5 dead, rod 5 cannot be moved and its gears drop out.
- What you may notice
- MIL on
- Gears on rod 5 missing
- Emergency program
- Likely causes
- LikelyTerminal pushed back in the gearbox connector
- PossibleOpen winding in solenoid S
- PossibleBroken control wire between TCM and valve
- 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.