P08C7Pressure Control Solenoid M Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Reports an on-and-off fault of pressure control solenoid M, such as brief circuit dropouts or occasional implausible responses. No manufacturer documents this code publicly; GM, which uses letter M for synchronizer actuation valve 1 of the Corvette dual clutch, lists no intermittent code for it, and earlier packages found the intermittent codes of the other pressure control solenoids unused as well. GM's circuit tests need a fault to last 150 ms, so short dropouts mostly end up as P08C8, P08CA or P08CB once they persist. CARB requires transmission solenoids to be monitored. Loose terminals and chafed wires are the likely causes; symptoms are sporadic shift faults and a warning light that comes and goes.
- What you may notice
- Warning light that comes and goes
- Sporadic rough shifts
- Likely causes
- LikelyLoose terminal at the solenoid or transmission connector
- PossibleChafed wire with intermittent contact
- RareDebris causing occasional valve hang-ups
- 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.