P08C9Pressure Control Solenoid M Control Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Meant for a control circuit of pressure control solenoid M that is not open or shorted but behaves implausibly, for instance a coil current that does not follow the command. No manufacturer documents this code publicly. GM, which uses letter M for synchronizer actuation valve 1 of the Corvette dual clutch, publishes only open, low, high and the two hydraulic codes for it; its tables do describe a current check that compares target and estimated current (more than 70 % for 60 ms or more than 400 mA for 300 ms), but without naming P08C9. CARB requires monitoring of transmission solenoids. Possible causes are a coil with drifting resistance, contact resistance or supply voltage problems; shift quality may suffer.
- What you may notice
- Check engine light on
- Uneven shift quality
- Likely causes
- LikelyCoil resistance out of specification
- PossibleHigh contact resistance at connector pins
- RareUnstable supply voltage to the transmission module
- 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.