P08CBPressure Control Solenoid M 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
- GM uses this code on the Corvette's Tremec dual clutch for synchronizer actuation valve 1 (odd-gear shaft) in two situations. First, a short to battery voltage: with the low-side driver on, a sense voltage above 0.7, 0.9 or 1.1 V (±0.1 V), depending on supply voltage, counts as a shorted load, confirmed after 150 ms. Second, a short to a neighbouring output: at shutdown every output is switched on in turn, a cross-reaction is stored in memory and the code is set at the next start. Type A, MIL at once. The check pauses while P0882 or P0883 is present. A valve shorted to power cannot be switched off, so the transmission will usually go into a fallback mode.
- What you may notice
- Check engine light on immediately
- Fallback mode with restricted gears
- Code may appear right after starting
- Likely causes
- LikelyControl wire shorted to battery voltage
- PossibleShort to an adjacent solenoid wire in the internal harness
- RareDefective driver stage in the transmission control 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.