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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 131 (Transfer Case - NVG 246-NP8) >> Diagnostic Information and Procedures >> Transfer Case Shift Control Switch Inoperative >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. 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.

  1. 2:  This step tests the functionality of the mode switch.
  2. 3:  This step tests the modules ability to operate the transfer case modes.
Transfer Case Shift Control Switch Inoperative

Step Action Yes No
Schematic Reference:  Transfer Case Control Schematics  
Connector End View Reference:  Transfer Case Control Connector End Views  
1
IMPORTANT: If the transfer case shift control switch is left between the 4HI and 4LO mode detents, the transfer case defaults to AWD mode. This is considered a characteristic of the system. Ensure the switch is within the proper detents.
Did you perform the Diagnostic System Check - Vehicle?		 Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Install a scan tool.
  2. Start the engine.
  3. Place the transmission into Neutral.
  4. Set the park brake.
  5. Use a scan tool in order to observe the Commanded Mode Indicator parameter while selecting each of the Mode positions.
Does the state change with the selection of any of the mode positions?		 Go to Step 5  Go to Step 3 
3 Replace the transfer case shift control switch. Refer to Transfer Case Shift Control Switch Replacement .
Did you complete the repair?		 Go to Step 5  -
4
IMPORTANT: After transfer case shift control module replacement and reprogramming, ensure all doors are closed and the key is out of the ignition, then open and close the doors again and wait 2 minutes to avoid incomplete programming or false communication DTCs.
Replace the transfer case shift control module. Refer to Control Module References for replacement, setup, and programming. Perform the Clutch Reset Procedure. Refer to Transfer Case High/Low Clutch Reset .Did you complete the repair?		 Go to Step 5  -
5
  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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