Test Description

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

2. This step determines the position of the front axle switch.
3. This step helps determine if the front axle will not engage.
4. This step helps determine if the front axle will not disengage.

Fig 1: Transfer Case Shift Control Switch Indicators Flash Continuously 15 Seconds Or More

Courtesy of GENERAL MOTORS CORP.