P27D5 code meaning
Pressure Control Solenoid S Control Circuit/Open
Powertrain system Generic code P27xx codes Check engine light
What P27D5 means
P27D5 stands for an interrupted control circuit of solenoid S. GM uses it for synchronizer actuation valve 5 in the Corvette DCT, documented in 23OBDG07 and again in 24OBDG07. While the low-side output is off, a working coil pulls the sense pin up to supply voltage; the driver chip then tries to hold that pin low with a tiny current. If it manages to, the pin settles at roughly 1.7 V to 3 V, and after 150 ms this counts as open load, Type A with MIL. The test only runs between 8.75 and 18 V supply, not during cranking, and is suppressed when P0882 or P0883 is present. Ford's TR9070 has no valve S. With valve 5 dead, rod 5 cannot be moved and its gears drop out.
P27D5 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 P27D5
- MIL on
- Gears on rod 5 missing
- Emergency program
Common causes of P27D5
- Most likelyTerminal pushed back in the gearbox connector
- PossibleOpen winding in solenoid S
- PossibleBroken control wire between TCM and valve
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 P27D5 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. |
| D5 | The exact fault in that area. |
What to do next
- Note P27D5 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 P27D5
What does P27D5 mean?
P27D5 means "Pressure Control Solenoid S Control Circuit/Open". P27D5 stands for an interrupted control circuit of solenoid S. It is a generic code, so it means the same on every make.
Is it safe to drive with P27D5?
Drive gently and only to a workshop. With P27D5 the car can go into limp mode (reduced power) to protect itself.
Will P27D5 fail an emissions test?
Yes, it can. P27D5 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 P27D5 to fix?
Difficulty: medium. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P27D5 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.