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.
Average mileage: 122,333 (98,000–135,000)
10 people reported this problem
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BUZZING SOUND UNDER CAR- get louder at certain rpm that increases with accelerating or decelerating. Get kit from dealer or wedge it.
Thought it was the gas tank expanding/contracting..........just another gm screw up
heat sheild makes annoying rattle at low rpm's not yet fixed looking for solution