Popping Noise From Muffler Heat Shield on GMC Sierra 1500

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.

RepairPal Verified
Average mileage: 100,500 (47,000–200,000)
Exhaust & Emissions affected: V8
9 model years affected: 1999, 2000, 2001, 2002, more2003, 2004, 2005, 2006, 2007
14 people reported this problem
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problem details
1999 GMC Sierra 1500 106,000 mi,
Two spot welds on the muffler heat shield broke and the shield flaps under certain conditions, causing a loud rattling sound from underneath the truck.
2007 GMC Sierra 1500 47,000 mi,
Not fixed yet but occurring