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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1388 (Front Drive Axle) >> Diagnostic Information and Procedures >> Four-Wheel Drive Does Not Engage

Four-Wheel Drive Does Not Engage

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. 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.
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 Front Drive Axle Actuator Replacement .
  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 Front Drive Axle Inner Shaft and Inner Shaft Housing Replacement (8.25 F4WD Axle)  or Front Drive Axle Inner Shaft and Inner Shaft Housing Replacement (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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