Popping Noise From Muffler Heat Shield on GMC Sierra 2500 HD

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: 75,750 (53,000–98,500)
Exhaust & Emissions affected: Gasoline
7 model years affected: 2001, 2002, 2003, 2004, more2005, 2006, 2007
9 people reported this problem
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problem details
2003 GMC Sierra 2500 HD 53,000 mi,
RATTELING NOISE ON EXCELLERATION. WAS FIXED BY PUTTING A LARGE HOSE CLAMP AROUND THE MUFFLER
2001 GMC Sierra 2500 HD 98,500 mi,
my muffler started rattling when I let off the gas