P27DF code meaning
Pressure Control Solenoid T Control Circuit Low
Powertrain system Generic code P27xx codes Check engine light
What P27DF means
P27DF points to a control line of solenoid T pulled too low. In Ford's 2024 OBD summary it is the shorted-switch fault of the selector pilot valve on the TR9070 dual-clutch gearbox, meaning the switched side of the coil is tied to ground and the valve can be powered permanently. Ford publishes no thresholds. GM's equivalent test on the Corvette selector pilot valve (P282F in 23OBDG07) flags a sense voltage below roughly 1.7 V for 100 ms while the output is on. A permanently applied pilot valve holds the selector in its working position, so the shift valves keep acting on the same rods and the controller has to fence off gears. Inspect for insulation damage and a coil shorted to ground.
P27DF 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 P27DF
- MIL on
- Gears fenced off, shifts limited to some gears
- Limp mode
Common causes of P27DF
- Most likelyDamaged insulation letting the wire touch ground
- PossibleSolenoid T coil shorted to ground
- Less likelyTCM output switch stuck conducting
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pressure control solenoid tWiring harness
What each part of P27DF 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. |
| DF | The exact fault in that area. |
What to do next
- Note P27DF 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 P27DF
What does P27DF mean?
P27DF means "Pressure Control Solenoid T Control Circuit Low". P27DF points to a control line of solenoid T pulled too low. It is a generic code, so it means the same on every make.
Is it safe to drive with P27DF?
Drive gently and only to a workshop. With P27DF the car can go into limp mode (reduced power) to protect itself.
Will P27DF fail an emissions test?
Yes, it can. P27DF 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 P27DF to fix?
Difficulty: medium. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P27DF clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.