P27C0Pressure Control Solenoid N Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P27C0 reports too high a voltage on the control line of solenoid N, usually a short to battery or to a neighbouring output. On the Corvette with GM's dual-clutch gearbox (table 23OBDG07, 2023), synchronizer actuation valve 2 is flagged when the sense voltage stays above roughly 0.7 to 1.1 V, depending on supply voltage, while the low-side switch is on, or when actual current misses the target by over 70 % for 60 ms or by over 400 mA for 300 ms. A separate test at shutdown energizes the outputs one by one to find two lines shorted together, stores the result and sets P27C0 at the next start. All are Type A; 24OBDG07 keeps the code. Ford's TR9070 list names it shorted load on SPV2.
- What you may notice
- MIL on
- Shift rod cannot be actuated; gears missing
- Code returns at every start after a shutdown test
- Likely causes
- LikelyControl wire shorted to a supply voltage
- PossibleTwo solenoid lines shorted together in the harness or connector
- PossiblePartially shorted solenoid coil drawing wrong current
- RareDamaged output stage 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.