P08C8 code meaning
Pressure Control Solenoid M Control Circuit/Open
Powertrain system Generic code P08xx codes Check engine light
What P08C8 means
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.
P08C8 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P08C8
- Check engine light on immediately
- Fallback mode with restricted gears
Common causes of P08C8
- Most likelyConnector at the control valve body loose or corroded
- PossibleBroken wire in the internal harness
- PossibleSolenoid coil open
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pressure control solenoid mWiring harness
What each part of P08C8 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 8 | Area: transmission. |
| C8 | The exact fault in that area. |
What to do next
- Note P08C8 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P08C8
What does P08C8 mean?
P08C8 means "Pressure Control Solenoid M Control Circuit/Open". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P08C8?
Drive gently and only to a workshop. With P08C8 the car can go into limp mode (reduced power) to protect itself.
Will P08C8 fail an emissions test?
Yes, it can. P08C8 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P08C8 to fix?
Difficulty: hard. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will P08C8 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.