P27BCPressure Control Solenoid N Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P27BC reports that the signal or response of pressure control solenoid N drops out now and then rather than failing permanently. No manufacturer documents this code publicly; the GM and Ford dual-clutch documents that use solenoid N for the second synchronizer valve (23OBDG07, Ford TR9070 list) only publish its permanent electrical and hydraulic faults. CARB 13 CCR 1968.2 counts automatic transmission solenoids among the outputs whose circuits must be watched for faults. Loose terminals, a chafed wire that touches only under vibration or heat, or a coil that opens when hot are the usual suspects. Because the fault comes and goes, freeze-frame data and a wiggle test with the harness moved are more useful than a single static measurement.
- What you may notice
- MIL that comes and goes
- Occasional missed or delayed shifts
- Likely causes
- LikelyLoose or spread terminal at solenoid N or TCM
- PossibleChafed wire shorting under vibration
- RareCoil opening intermittently when hot
- 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: €80 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.