What does code P279B mean?

Q: What does code P279B mean?

Transfer Case Gear Low Incorrect Ratio. P279B indicates that the transfer case control module has detected an incorrect ratio between the transmission output speed and the transfer case output speed when the transfer case is engaged in low range. The computer compares these two speed signals and flags the code when the calculated ratio does not match the programmed low-range ratio within a calibrated tolerance.

DTC codes / P27xx · Transmission / P279B

P279BTransfer Case Gear Low Incorrect Ratio

P279B indicates that the transfer case control module has detected an incorrect ratio between the transmission output speed and the transfer case output speed when the transfer case is engaged in low range. The computer compares these two speed signals and flags the code when the calculated ratio does not match the programmed low-range ratio within a calibrated tolerance.

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.