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Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

  1. 2:  This step determines whether the failure is the result of a faulty transfer case shift control module or the IPC.
Service Indicator Inoperative

Step Action Yes No
Schematic Reference: Transfer Case Control Schematics 
Connector End View Reference: Transfer Case Control Connector End Views 
1 Did you perform the Diagnostic System Check - Transfer Case? Go to Step 2  Go to Diagnostic System Check - Transfer Case 
2 
  1. Turn the ignition ON, with the engine OFF.
  2. Install a scan tool.
  3. Using the scan tool, command the SERVICE 4WD Lamp ON.
Does the SERVICE 4WD Lamp turn ON?		 Go to Step 3  Go to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gages, and Console.
3 Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement  and Transfer Case Control Module Reprogramming .
Did you complete the repair?		 Go to Step 4  -
4
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle in order to determine if the symptom has been corrected.
Is the symptom still present?		 Go to Step 2  System OK
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