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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 103 (Front Drive Axle) >> Diagnostic Information and Procedures >> Four-Wheel Drive Does Not Engage

Four-Wheel Drive Does Not Engage

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including 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.
IMPORTANT: Before performing the following diagnostic procedure, ensure that all electrical diagnostic procedures have been performed and there are no DTCs.
Four-Wheel Drive Does Not Engage

Step Action Yes No
1 Confirm operation of system. Refer to Diagnostic Starting Point - Front Drive Axle .
Is the system operating properly?		 Test the system Go to Step 2 
2
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Remove the actuator motor. Refer to Actuator Replacement - Front Drive Axle .
  3. Using a brass drift, apply pressure to the clutch fork.
  4. Turn the right wheel to align the clutch gears.
While turning the right wheel, does the left wheel turn in the opposite direction?		 Test the system Go to Step 3 
3
  1. Remove the inner axle shaft and housing assembly. Refer to Inner Shaft and/or Housing Replacement - Front Drive Axle (8.25 F4WD Axle)  or Inner Shaft and/or Housing Replacement - Front Drive Axle (8.25 S4WD and 9.25 Axles) .
  2. Inspect the following:
    • Clutch Fork
    • Clutch Sleeve
    • Clutch Gear
    • Clutch Return Spring

      Repair as needed.

Did you complete the repair?		 Test the system System OK
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