What does code P27C9 mean?

Q: What does code P27C9 mean?

Pressure Control Solenoid R Performance/Stuck Off. P27C9 indicates that the transmission control module (TCM) has detected a performance problem or stuck-off condition with pressure control solenoid R, which is responsible for regulating hydraulic pressure inside the automatic transmission. The computer compares commanded solenoid current or duty cycle against actual pressure sensor feedback and sets this code when the expected pressure change does not occur within a calibrated time window.

DTC codes / P27xx · Transmission / P27C9

P27C9Pressure Control Solenoid R Performance/Stuck Off

P27C9 indicates that the transmission control module (TCM) has detected a performance problem or stuck-off condition with pressure control solenoid R, which is responsible for regulating hydraulic pressure inside the automatic transmission. The computer compares commanded solenoid current or duty cycle against actual pressure sensor feedback and sets this code when the expected pressure change does not occur within a calibrated time window.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaTransmission

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.