P27C8Pressure Control Solenoid P 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
- P27C8 signals too high a level in the control circuit of solenoid P. GM's Corvette DCT tables 23OBDG07 and 24OBDG07 store it for synchronizer actuation valve 3 in three situations, all Type A. First, with the low-side switch on, the sense voltage stays above a supply-dependent limit of 0.7, 0.9 or 1.1 V (below 11.5 V, 12-15 V, above 15.5 V battery). Second, the current estimated from duty cycle and supply deviates from its target by more than 70 % (60 ms) or by more than 400 mA (300 ms). Third, a shutdown routine switches each output separately, detects valve 3 shorted to a neighbour and sets the code at the next start. Ford calls it shorted load on SPV3 of the TR9070.
- What you may notice
- MIL on, possibly at the start after a previous drive
- Gears of rods 3/4 unavailable
- Limp mode
- Likely causes
- LikelyControl line shorted to battery voltage
- PossibleControl line shorted to a neighbouring solenoid output
- PossibleSolenoid P coil with too low resistance (shorted turns)
- RareTCM driver stage fault
- 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.