P27C8 code meaning
Pressure Control Solenoid P Control Circuit High
Powertrain system Generic code P27xx codes Check engine light
What P27C8 means
P27C8 signals too high a level in the control circuit of solenoid P. GM's Corvette DCT tables 23OBDG07 and 24OBDG07 store it for synchronizer actuation valve 3 in three situations, all Type A. First, with the low-side switch on, the sense voltage stays above a supply-dependent limit of 0.7, 0.9 or 1.1 V (below 11.5 V, 12-15 V, above 15.5 V battery). Second, the current estimated from duty cycle and supply deviates from its target by more than 70 % (60 ms) or by more than 400 mA (300 ms). Third, a shutdown routine switches each output separately, detects valve 3 shorted to a neighbour and sets the code at the next start. Ford calls it shorted load on SPV3 of the TR9070.
P27C8 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 P27C8
- MIL on, possibly at the start after a previous drive
- Gears of rods 3/4 unavailable
- Limp mode
Common causes of P27C8
- Most likelyControl line shorted to battery voltage
- PossibleControl line shorted to a neighbouring solenoid output
- PossibleSolenoid P coil with too low resistance (shorted turns)
- Less likelyTCM driver stage fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pressure control solenoid pWiring harness
What each part of P27C8 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. |
| C8 | The exact fault in that area. |
What to do next
- Note P27C8 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 P27C8
What does P27C8 mean?
P27C8 means "Pressure Control Solenoid P Control Circuit High". P27C8 signals too high a level in the control circuit of solenoid P. It is a generic code, so it means the same on every make.
Is it safe to drive with P27C8?
Drive gently and only to a workshop. With P27C8 the car can go into limp mode (reduced power) to protect itself.
Will P27C8 fail an emissions test?
Yes, it can. P27C8 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 P27C8 to fix?
Difficulty: medium. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P27C8 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.