P27BFPressure Control Solenoid N 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
- P27BF indicates the control line of solenoid N is pulled too low, in practice a short to ground. GM's 23OBDG07 table for the Corvette dual-clutch gearbox checks synchronizer actuation valve 2 while its low-side switch is on: should the sense-pin voltage fall below about 1.7 V (tolerance 0.5 V), the driver chip reports a ground short; 150 ms confirmation, battery between 8.75 and 18 V, engine not cranking, Type A. With the line grounded the solenoid can be energized permanently and the controller loses control of it. Ford's TR9070 table calls the same event shorted switch on SPV2. A pinched harness against the case or water in a connector are frequent reasons.
- What you may notice
- MIL on immediately
- Unintended gear actuation or locked-out gears
- Limp mode
- Likely causes
- LikelyControl wire chafed through to ground
- PossibleMoisture or corrosion bridging the connector
- RareSolenoid winding shorted to its housing
- 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.