P27BAPressure Control Solenoid N 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
- P27BA is the opposite fault to P27B9: solenoid N keeps applying pressure when it should be released. GM's dual-clutch table 23OBDG07 (Corvette) describes the effect of a synchronizer valve 2 stuck on as a constant push on one shift rod. Because the selector routes that pressure differently once the selector moves to another position, one rod relaxes or another moves although no movement was commanded; the TCM watches the rod position sensors for this, Type A, and 24OBDG07 keeps the check. Ford's TR9070 list pairs the same code with SPV2 hydraulically stuck on. Possible consequences are a gear dragging in, gear clash or a forced protective mode, because two gears on one shaft must never engage together.
- What you may notice
- MIL and transmission warning
- Gear clash or grinding on shifts
- Limp mode with restricted gears
- Likely causes
- LikelyValve spool stuck open by contamination
- PossibleWorn solenoid armature not returning to rest
- PossibleFluid contaminated with clutch or synchronizer wear particles
- 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.