What does code P279A mean?

Q: What does code P279A mean?

Transfer Case Gear High Incorrect Ratio. P279A indicates that the transfer case control module has detected an incorrect ratio between the input and output speeds of the transfer case when the gear is engaged. The computer compares the expected speed ratio for the commanded transfer case gear against the actual speeds from the input and output speed sensors, and it sets this code when the calculated ratio falls outside the acceptable range.

DTC codes / P27xx · Transmission / P279A

P279ATransfer Case Gear High Incorrect Ratio

P279A indicates that the transfer case control module has detected an incorrect ratio between the input and output speeds of the transfer case when the gear is engaged. The computer compares the expected speed ratio for the commanded transfer case gear against the actual speeds from the input and output speed sensors, and it sets this code when the calculated ratio falls outside the acceptable range.

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.