P27CB
Pressure Control Solenoid R Electrical
The TCM detects an electrical fault on transmission pressure control solenoid R. Hydraulic pressure cannot be modulated as expected, causing harsh or slipping shifts.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Internal solenoid faultCommon
- Wiring or connector faultPossible
Parts involved
- Pressure Control Solenoid R
- TCM
- Transmission Wiring
P27CB is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.