P27D0Pressure Control Solenoid R 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
- P27D0 is the high-side counterpart of P27CF for solenoid R: the control line reads too high, most often because it touches battery voltage or another output. GM applies the same driver diagnostics to synchronizer actuation valve 4 of the Corvette dual-clutch box as to the other valves (23OBDG07, 24OBDG07): a sense voltage stuck above 0.7-1.1 V while switched on, a large gap between target and estimated current, or a cross-short to a neighbouring line found during the switch-off routine and reported on the next start, each Type A. Ford's TR9070 overview lists shorted load of SPV4 under this code. A coil with too few ohms can also cause it, so measure resistance before replacing the harness.
- What you may notice
- MIL on, sometimes only after restart
- Gears on rods 3/4 not available
- Limp mode
- Likely causes
- LikelyControl line touching battery voltage
- PossibleCross-short to a neighbouring solenoid line
- PossibleSolenoid R coil resistance too low
- RareDefective TCM driver
- 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.