P279B

Transfer Case Gear Low Incorrect Ratio

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–222 (est.)

Symptoms

Unstable operation of the transfer case
Reduced power transfer efficiency
Unusual noises from the transfer case
Check Engine Light Illuminated
Gear shifting problems

Causes

Low or dirty oil level in transfer case
Worn or damaged transfer case gears
Malfunction of transfer case sensors
Problems with the electrical circuit of the sensors
Transmission control module (TCM) malfunction

How to Fix

Check the level and condition of the oil in the transfer case
Diagnose transfer case sensors and their circuits
Check the mechanical condition of the transfer case
Replace damaged components if necessary
Reset error and test drive

Related codes

P279A P279C P279D