P27BBPressure Control Solenoid N Electrical
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P27BB is a catch-all electrical code for pressure control solenoid N, and no manufacturer documents it publicly. The two makers known to use solenoid N, GM on the Corvette dual-clutch unit (23OBDG07) and Ford on the TR9070, both split electrical faults of this synchronizer valve into separate codes instead: P27BD covers an open load, P27BF a grounded line and P27C0 a line shorted to battery voltage. A controller with a less detailed driver stage could report all of these under P27BB. CARB 13 CCR 1968.2 requires circuit monitoring of such output components. Checks therefore cover coil resistance, connector pins inside the transmission and the harness to the TCM.
- What you may notice
- MIL on
- Gears served by solenoid N unavailable
- Likely causes
- LikelySolenoid N coil open or shorted
- PossibleCorroded or loose internal transmission connector
- PossibleDamaged harness between TCM and transmission
- RareFaulty output 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.