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 1500 Popping Noise From Muffler Heat Shield
GMC Sierra 1500 Problem
Exhaust & Emissions Affected: V8
Average Mileage: 67,333 mi (47,000 mi - 106,000 mi)