What does code P27A8 mean?

Q: What does code P27A8 mean?

Pressure Control Solenoid B Data Incompatible. P27A8 means the transmission control module (TCM) has received data from the Pressure Control Solenoid B circuit that does not match the expected values for the current operating conditions. The TCM compares commanded pressure against actual hydraulic response and flags the solenoid as reporting incompatible data, which can affect shift quality and line pressure control.

DTC codes / P27xx · Transmission / P27A8

P27A8Pressure Control Solenoid B Data Incompatible

P27A8 means the transmission control module (TCM) has received data from the Pressure Control Solenoid B circuit that does not match the expected values for the current operating conditions. The TCM compares commanded pressure against actual hydraulic response and flags the solenoid as reporting incompatible data, which can affect shift quality and line pressure control.

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.