Test Description

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 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 actuator.
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 Diagnosis

Courtesy of GENERAL MOTORS CORP.