P27D4 code meaning
Pressure Control Solenoid S Intermittent
Powertrain system Generic code P27xx codes Check engine light
What P27D4 means
P27D4 means the controller noticed solenoid S dropping out now and then, electrically or in its effect, without the fault staying present. No manufacturer publishes this code. GM, whose Corvette dual-clutch gearbox has a fifth synchronizer valve for rod 5 (tables 23OBDG07 and 24OBDG07), reports lasting wiring faults on it as P27D5, P27D7 and P27D8 and its stuck states as P27D1 and P27D2; a separate sporadic code is not listed there. CARB 13 CCR 1968.2 still requires transmission actuators to be monitored. For the driver it can mean an occasional refusal of the rod 5 gears. Wiggle-test the harness with the engine running, inspect the gearbox connector seal and check whether the fault follows heat.
P27D4 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 P27D4
- MIL comes and goes
- Rod 5 gears occasionally refused
Common causes of P27D4
- Most likelyGearbox connector seal leaking, terminals corroding
- PossibleHarness conductor breaking under engine movement
- Less likelySolenoid S winding dropping out when hot
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 P27D4 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. |
| D4 | The exact fault in that area. |
What to do next
- Note P27D4 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 P27D4
What does P27D4 mean?
P27D4 means "Pressure Control Solenoid S Intermittent". P27D4 means the controller noticed solenoid S dropping out now and then, electrically or in its effect, without the fault staying present. It is a generic code, so it means the same on every make.
Is it safe to drive with P27D4?
Drive gently and only to a workshop. With P27D4 the car can go into limp mode (reduced power) to protect itself.
Will P27D4 fail an emissions test?
Yes, it can. P27D4 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 P27D4 to fix?
Difficulty: medium. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P27D4 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.