The muffler heat shield may become loose on the muffler causing a rattle or popping noise. Our technicians tell us there is a kit available from GM to correct this problem.
Car Problem Reports
GMC Sierra 2500 HD Popping Noise From Muffler Heat Shield
GMC Sierra 2500 HD Problem
Exhaust & Emissions Affected: Gasoline
Average Mileage: 75,750 mi (53,000 mi - 98,500 mi)