P08C8Pressure Control Solenoid M Control Circuit/Open
- 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 an open circuit at synchronizer actuation valve 1, the valve for the odd-gear shaft. The open-load test runs with the low-side driver switched off: an intact coil pulls the sense pin to battery voltage, so if the driver chip can hold it between about 1.7 and 3 V (each ±0.5 V) with a very small current, the circuit is considered open. The fault must persist for 150 ms with battery voltage between 8.75 and 18 V and the engine not cranking; it is suspended while P0882 or P0883 indicates a supply problem. Type A, MIL at once. Without this valve the odd shaft cannot be shifted reliably, so a fallback mode is likely.
- What you may notice
- Check engine light on immediately
- Fallback mode with restricted gears
- Likely causes
- LikelyConnector at the control valve body loose or corroded
- PossibleBroken wire in the internal harness
- PossibleSolenoid coil open
- 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.