P27D8 code meaning
Pressure Control Solenoid S Control Circuit High
Powertrain system Generic code P27xx codes Check engine light
What P27D8 means
P27D8 says the control line of solenoid S sits too high. GM bundles three checks for valve 5 of the Corvette dual-clutch box under it (23OBDG07, 24OBDG07), all Type A. First, with the output on, a sense voltage above 700, 900 or 1,100 mV, depending on whether supply is below 11.5 V, between 12 and 15 V or above 15.5 V, means a short to battery. Second, coil current that misses its target by more than 70 % for 60 ms or by 400 mA for 300 ms. Third, a short to a neighbouring output found while every output is cycled at shutdown; it is stored in memory and set on the next start. Ford's TR9070 has no valve S. An energized valve 5 then fails to move rod 5, so its gears stay out of reach.
P27D8 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor1 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P27D8
- MIL on, possibly only after the next start
- Rod 5 gears out of reach
- Limp mode
Common causes of P27D8
- Most likelyControl wire touching a supply line
- PossibleShort to the wire of another valve output
- PossibleSolenoid S coil with shorted turns
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pressure control solenoid sWiring harness
What each part of P27D8 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 7 | Area: transmission. |
| D8 | The exact fault in that area. |
What to do next
- Note P27D8 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 P27D8
What does P27D8 mean?
P27D8 means "Pressure Control Solenoid S Control Circuit High". P27D8 says the control line of solenoid S sits too high. It is a generic code, so it means the same on every make.
Is it safe to drive with P27D8?
Drive gently and only to a workshop. With P27D8 the car can go into limp mode (reduced power) to protect itself.
Will P27D8 fail an emissions test?
Yes, it can. P27D8 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 P27D8 to fix?
Difficulty: medium. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P27D8 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.