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
Chevrolet Avalanche 2500 Popping Noise From Muffler Heat Shield
Chevrolet Avalanche 2500 Problem
Average Mileage: 162,562 mi (125,000 mi - 200,125 mi)