P27CB code meaning
Pressure Control Solenoid R Electrical
Powertrain system Generic code P27xx codes Check engine light
What P27CB means
An electrical fault of unspecified kind on solenoid R is what P27CB stands for. There is no public manufacturer description of this exact code. GM (shift solenoid 4 in the Corvette DCT table 23OBDG07) and Ford (SPV4 of the TR9070, 2024 overview) both use solenoid R, yet they break its wiring faults down into P27CD, P27CF and P27D0 rather than one lumped code. CARB 13 CCR 1968.2 obliges the module to detect circuit faults on such actuators. In practice the same checks apply as for the detailed codes: winding resistance against specification, pin fit inside the gearbox connector, insulation of the harness and, last of all, the output stage of the TCM.
P27CB 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 P27CB
- MIL on
- Gear selection limited
- Emergency mode possible
Common causes of P27CB
- Most likelySolenoid R winding resistance out of specification
- PossiblePoor pin fit in the gearbox connector
- PossibleDamaged harness insulation
- Less likelyTCM output stage fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pressure control solenoid rTCMWiring harness
What each part of P27CB 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. |
| CB | The exact fault in that area. |
What to do next
- Note P27CB 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 P27CB
What does P27CB mean?
P27CB means "Pressure Control Solenoid R Electrical". An electrical fault of unspecified kind on solenoid R is what P27CB stands for. It is a generic code, so it means the same on every make.
Is it safe to drive with P27CB?
Drive gently and only to a workshop. With P27CB the car can go into limp mode (reduced power) to protect itself.
Will P27CB fail an emissions test?
Yes, it can. P27CB 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 P27CB to fix?
Difficulty: medium. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P27CB clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.