Popping Noise From Muffler Heat Shield on Chevrolet Avalanche 2500

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.

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Average mileage: 162,562 (125,000–200,125)
5 model years affected: 2002, 2003, 2004, 2005, more2006
7 people reported this problem
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problem details
2004 Chevrolet Avalanche 2500 125,000 mi,
muffler rattlers when idling
2002 Chevrolet Avalanche 2500 200,125 mi,
after shutting off truck, i hear a pop coming from exaust