P27D7 code meaning
Pressure Control Solenoid S Control Circuit Low
Powertrain system Generic code P27xx codes Check engine light
What P27D7 means
P27D7 reports the control line of solenoid S stuck at too low a level, typically a short to ground. GM applies it to synchronizer actuation valve 5 on the Corvette dual-clutch gearbox (23OBDG07, carried into 24OBDG07): with the output switched on, the sense pin should be pulled down only partly; if it drops below roughly 1.7 V and stays there 150 ms, the driver chip flags a ground short and the TCM stores a Type A fault. As the coil is switched on the ground side, a grounded line can leave valve 5 powered without command, pushing rod 5 against the intended gear. Ford's TR9070 does not use solenoid S. Look for chafed insulation near brackets and for a coil shorted to its housing.
P27D7 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 P27D7
- MIL on
- Unintended rod 5 movement, gears locked
- Limp mode
Common causes of P27D7
- Most likelyControl wire chafed through to ground
- PossibleSolenoid S coil shorted to its housing
- Less likelyFaulty low-side driver in the TCM
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 P27D7 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. |
| D7 | The exact fault in that area. |
What to do next
- Note P27D7 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 P27D7
What does P27D7 mean?
P27D7 means "Pressure Control Solenoid S Control Circuit Low". P27D7 reports the control line of solenoid S stuck at too low a level, typically a short to ground. It is a generic code, so it means the same on every make.
Is it safe to drive with P27D7?
Drive gently and only to a workshop. With P27D7 the car can go into limp mode (reduced power) to protect itself.
Will P27D7 fail an emissions test?
Yes, it can. P27D7 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 P27D7 to fix?
Difficulty: medium. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P27D7 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.