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.
- 2: This step determines the position of the front axle switch.
- 3: This step helps determine if the front axle will not engage.
- 4: This step helps determine if the front axle will not disengage.
Transfer Case Shift Control Switch Indicators Flash Continuously 15 Seconds or More
| 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 - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
Go to Step 4 | Go to Step 3 |
| 3 | Using a scan tool, observe the Encoder Gear Position parameter. Is the transfer case in AUTO 4WD, 4WD HI or 4WD Low mode? |
Go to Front Axle Will Not Engage | Go to Step 5 |
| 4 | Using a scan tool, observe the Encoder Gear Position parameter. Is the transfer case in 2WD mode? |
Go to Front Axle Will Not Disengage | Go to Step 5 |
| 5 | 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 6 | - |
| 6 |
|
Go to Step 2 | System OK |