Abnormal Activities or Responses for GMC Truck GMC Sierra Denali 2006

Excessive Creep in First and Reverse Gears

Engine idle speed too high

Adjust to the correct idle speed.

Vehicle Moves Forward in Neutral

1-2-3-4 clutch failed or not released

Rebuild the 1-2-3-4 clutch.

Vehicle Moves Backward in Neutral

3rd, 5th and reverse clutch failed or not released

Rebuild the 3rd, 5th and reverse clutch assembly.