P08CAPressure Control Solenoid M 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
- GM sets this code on the Corvette's Tremec dual clutch for a short to ground in the circuit of synchronizer actuation valve 1, which serves the odd-gear shaft. The test runs while the low-side driver is switched on: the sense pin should then sit at a defined level, and if the driver chip reports it below about 1.7 V (±0.5 V), a ground short is assumed. Confirmation takes 150 ms at 8.75 to 18 V battery voltage with the engine not cranking, and the check is suspended when P0882 or P0883 is present. Type A, MIL at once, monitored continuously. Valves 2 to 5 have their own low codes (P27BF onwards). The driver should expect a fallback mode until the wiring fault is repaired.
- What you may notice
- Check engine light on immediately
- Fallback mode with restricted gears
- Likely causes
- LikelyControl wire chafed through to ground
- PossibleShorted turns in the solenoid coil
- RareFluid in the transmission connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.