P27B9Pressure Control Solenoid N 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
- P27B9 says pressure control solenoid N does not build hydraulic force when commanded. On dual-clutch gearboxes this letter belongs to the second synchronizer pressure valve: Ford's 2024 summary lists it for SPV2 of the TR9070, and GM's 2023 Corvette table 23OBDG07 calls it shift solenoid 2 hydraulically stuck off. GM runs a synchronizer integrity routine after a shift-related fault or when the gear remembered at shutdown disagrees with the sensors at start-up; small test movements of the shift rods that stay at or below 100 micrometres with valve 2 actuated set the code, Type A, and 24OBDG07 keeps it. The driver may find gears on that rod unavailable.
- What you may notice
- MIL on
- Certain gears cannot be selected; gear skipping
- Substitute mode with reduced gear set
- Likely causes
- LikelyValve spool sticking closed from debris or varnish
- PossibleLow or contaminated transmission fluid reducing supply pressure
- PossibleLeak in the synchronizer actuator circuit
- 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.