On average, the 2005 GMC Sierra 3500 starts to “feel” problems with the ENGINE and its various aspects after 85 000 miles.
Recently reported ENGINE problems on 2005 GMC Sierra 3500
Engine exhaust manifold bolts break off on 2 different gm 1 ton trucks. bad/ failed vehicle emissions and a huge repair bill for both trucks. 85,000 miles on both vehicles.