Symptoms - Transfer Case: Notes

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.

IMPORTANT: Perform the Diagnostic System Check-Transfer Case before using the symptom tables, in order to verify that the following conditions are true:

DTCs are not set.
The control modules can communicate via the serial data link.
Review the system operation in order to familiarize yourself with the system functions. Refer to Transfer Case Description and Operation .
Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
Inspect the automatic transfer case for the proper fluid level.