GMC Sierra 1500 Problem Report

GMC Sierra 1500 Popping Noise From Muffler Heat Shield

(14 reports)

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.

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. -
Not fixed yet but occurring -
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