P27CA code meaning
Pressure Control Solenoid R Stuck On
Powertrain system Generic code P27xx codes Check engine light
What P27CA means
P27CA is the stuck-on fault of solenoid R, GM's shift solenoid 4 on the Corvette dual-clutch transmission. The detection in 23OBDG07 mirrors that of valve 3 because both valves share rods 3 and 4, only with opposite pushing direction: a selector change followed by an uncommanded jump of one rod of at least 1 mm inside 200 ms plus a 0.125 mm relaxation of its partner points to valve 4 holding pressure. The check runs continuously, rated Type A, and is retained in 24OBDG07. Ford pairs the code with SPV4 of the TR9070. A valve that cannot vent tends to leave a rod loaded, which may show up as gear grinding or a protective lock-out of gears.
P27CA at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor2 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P27CA
- MIL on
- Grinding or clunk when changing gears
- Gears locked out by the controller
Common causes of P27CA
- Most likelySpool of solenoid R jammed open
- PossibleDebris lodged in valve R preventing venting
- Less likelyInternal wear of solenoid R armature or seat
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pressure control solenoid rValve body
What each part of P27CA 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. |
| CA | The exact fault in that area. |
What to do next
- Note P27CA 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 P27CA
What does P27CA mean?
P27CA means "Pressure Control Solenoid R Stuck On". P27CA is the stuck-on fault of solenoid R, GM's shift solenoid 4 on the Corvette dual-clutch transmission. It is a generic code, so it means the same on every make.
Is it safe to drive with P27CA?
Drive gently and only to a workshop. With P27CA the car can go into limp mode (reduced power) to protect itself.
Will P27CA fail an emissions test?
Yes, it can. P27CA 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 P27CA to fix?
Difficulty: workshop only. A typical repair takes 2 to 8 hours of work. This is a job for a workshop.
Will P27CA clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.