Sierra 1500

Popping Noise From Muffler Heat Shield on GMC Sierra 1500

Problem Description and Possible Solution

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.

Problem Data
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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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.