P27D1 code meaning
Pressure Control Solenoid S Performance/Stuck Off
Powertrain system Generic code P27xx codes Check engine light
What P27D1 means
P27D1 flags pressure control solenoid S as unable to produce force. Only GM documents it publicly: in the Corvette dual-clutch tables 23OBDG07 and 24OBDG07 it is shift solenoid 5, the only one of these valves serving a single rod, rod 5, which it moves in both directions depending on the selector position. If the intrusive integrity routine sees 100 µm or less of travel on rod 5 while valve 5 is applied, the fault is stored as Type A. Ford's TR9070 has just four synchronizer valves, so the code does not appear there. Gears carried on rod 5 become unavailable; fluid condition, a sticking spool or a leak in the rod actuator are the first things to check.
P27D1 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 P27D1
- MIL on
- Gears on rod 5 unavailable
- Gearbox in substitute mode
Common causes of P27D1
- Most likelySpool of solenoid S sticking closed
- PossibleLow or worn-out transmission fluid
- PossibleLeak at the rod 5 actuator piston
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pressure control solenoid sValve body
What each part of P27D1 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. |
| D1 | The exact fault in that area. |
What to do next
- Note P27D1 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 P27D1
What does P27D1 mean?
P27D1 means "Pressure Control Solenoid S Performance/Stuck Off". P27D1 flags pressure control solenoid S as unable to produce force. It is a generic code, so it means the same on every make.
Is it safe to drive with P27D1?
Drive gently and only to a workshop. With P27D1 the car can go into limp mode (reduced power) to protect itself.
Will P27D1 fail an emissions test?
Yes, it can. P27D1 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 P27D1 to fix?
Difficulty: workshop only. A typical repair takes 2 to 8 hours of work. This is a job for a workshop.
Will P27D1 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.