P08C7 code meaning
Pressure Control Solenoid M Intermittent
Powertrain system Generic code P08xx codes Check engine light
What P08C7 means
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.
P08C7 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 5 hours
- Clears after repairAfter a drive cycle
Symptoms of P08C7
- Warning light that comes and goes
- Sporadic rough shifts
Common causes of P08C7
- Most likelyLoose terminal at the solenoid or transmission connector
- PossibleChafed wire with intermittent contact
- Less likelyDebris causing occasional valve hang-ups
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 P08C7 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. |
| C7 | The exact fault in that area. |
What to do next
- Note P08C7 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 P08C7
What does P08C7 mean?
P08C7 means "Pressure Control Solenoid M Intermittent". Reports an on-and-off fault of pressure control solenoid M, such as brief circuit dropouts or occasional implausible responses. It is a generic code, so it means the same on every make.
Is it safe to drive with P08C7?
Drive gently and only to a workshop. With P08C7 the car can go into limp mode (reduced power) to protect itself.
Will P08C7 fail an emissions test?
Yes, it can. P08C7 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 P08C7 to fix?
Difficulty: hard. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will P08C7 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.