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Diagnostic System Check - Transfer Case: Notes

WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

These diagnostic procedures will help you to find and repair automatic transfer case (ATC) system malfunctions. This service category also contains information for repairing ATC system malfunctions. For best results, use the diagnostic tables and follow the sequence listed below:

  1. Perform the Diagnostic System Check - Transfer Case. All ATC diagnostics must begin with the Diagnostic System Check - Transfer Case. The Diagnostic System Check - Transfer Case determines the following:
    • Proper SERVICE 4WD indicator operation
    • Ability of the transfer case shift control module to communicate through the data link connector (DLC)
    • Existence of ATC DTCs
  2. Refer to the diagnostic table as directed by the Diagnostic System Check - Transfer Case. The diagnostic tables help enable you to diagnose any ATC system malfunction. Bypassing these procedures may result in the following:
    • Extended diagnostic time
    • Incorrect diagnosis
    • Incorrect parts replacement
  3. Repeat the Diagnostic System Check - Transfer Case after you perform any repair or diagnostic procedure. This will verify that you correctly performed the repair. This will also ensure that other malfunctions do not exist.
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