P27BA code meaning
Pressure Control Solenoid N Stuck On
Powertrain system Generic code P27xx codes Check engine light
What P27BA means
P27BA is the opposite fault to P27B9: solenoid N keeps applying pressure when it should be released. GM's dual-clutch table 23OBDG07 (Corvette) describes the effect of a synchronizer valve 2 stuck on as a constant push on one shift rod. Because the selector routes that pressure differently once the selector moves to another position, one rod relaxes or another moves although no movement was commanded; the TCM watches the rod position sensors for this, Type A, and 24OBDG07 keeps the check. Ford's TR9070 list pairs the same code with SPV2 hydraulically stuck on. Possible consequences are a gear dragging in, gear clash or a forced protective mode, because two gears on one shaft must never engage together.
P27BA 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 P27BA
- MIL and transmission warning
- Gear clash or grinding on shifts
- Limp mode with restricted gears
Common causes of P27BA
- Most likelyValve spool stuck open by contamination
- PossibleWorn solenoid armature not returning to rest
- PossibleFluid contaminated with clutch or synchronizer wear particles
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pressure control solenoid nValve body
What each part of P27BA 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. |
| BA | The exact fault in that area. |
What to do next
- Note P27BA 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 P27BA
What does P27BA mean?
P27BA means "Pressure Control Solenoid N Stuck On". P27BA is the opposite fault to P27B9: solenoid N keeps applying pressure when it should be released. It is a generic code, so it means the same on every make.
Is it safe to drive with P27BA?
Drive gently and only to a workshop. With P27BA the car can go into limp mode (reduced power) to protect itself.
Will P27BA fail an emissions test?
Yes, it can. P27BA 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 P27BA to fix?
Difficulty: workshop only. A typical repair takes 2 to 8 hours of work. This is a job for a workshop.
Will P27BA clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.