P27C1 code meaning
Pressure Control Solenoid P Performance/Stuck Off
Powertrain system Generic code P27xx codes Check engine light
What P27C1 means
P27C1 is logged when pressure control solenoid P is commanded but the shift rods it serves barely move. In GM's Corvette dual-clutch documentation (23OBDG07, unchanged in 24OBDG07) the part is shift solenoid 3; with the selector valve in one position it pushes rod 3, in the other rod 4, both in the A-to-B direction. During GM's intrusive synchronizer check, run after a shift fault or a gear mismatch found at power-up, travel of 100 µm or less on the commanded rod counts as no response, Type A. Ford's 2024 summary assigns the code to SPV3 of the TR9070. Gears selected via rods 3 and 4 may be locked out and the gearbox may run on a reduced set of ratios.
P27C1 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 P27C1
- MIL on with transmission warning
- Certain gears skipped or not selectable
- Delayed or failed launch in affected gear
Common causes of P27C1
- Most likelyValve spool of solenoid P held in the closed position by debris or varnish
- PossibleLow, aerated or degraded transmission fluid so no pressure builds
- PossibleLeaking seal on the shift rod actuator piston for rods 3/4
- Less likelyMechanically binding shift rod or fork
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pressure control solenoid pValve body
What each part of P27C1 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. |
| C1 | The exact fault in that area. |
What to do next
- Note P27C1 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 P27C1
What does P27C1 mean?
P27C1 means "Pressure Control Solenoid P Performance/Stuck Off". P27C1 is logged when pressure control solenoid P is commanded but the shift rods it serves barely move. It is a generic code, so it means the same on every make.
Is it safe to drive with P27C1?
Drive gently and only to a workshop. With P27C1 the car can go into limp mode (reduced power) to protect itself.
Will P27C1 fail an emissions test?
Yes, it can. P27C1 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 P27C1 to fix?
Difficulty: workshop only. A typical repair takes 2 to 8 hours of work. This is a job for a workshop.
Will P27C1 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.