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: 103,273 (5,000–204,000)
Exhaust & Emissions affected: Gasoline
34 people reported this problem
The heat shield on top of the muffler has come loose at one corner and now makes an annoying rattle with the engine at an idle. While cruising it usually goes away, however can still be heard at some RPMs.
"vibration" type rattle at around 2200 rpms. The truck has to be under a load meaning in gear. Just revving the engine, in park, will not recreate the noise.
Popping noise from exhaust
Popping noise from muffler heat shield. Mechanic removed the heat shield.
I have a rattling sound that comes from my heat shield, after the truck is warmed up it goes away. I have yet to have it repaired because it only does it when it's cold and I first start it.
Muffler seems to hum, sounds like a faint train when truck is started. After it warms up, sound goes away.
Tack welded heat shield which did not last long. I cut the shield off and no more noise.
heat shield metal when accelerating. Also numerous harnesses and parts dangle from the engine until I see it the n being too late and corrosion began. Tranny acted up and npw no park as I realized also half the parking brake frayed and burnt so I had it replaced. Stereo amp went out, after 2 speakers (factory). Muffler drips water out of as small hole in the canister and the two tailgate lifts are corroding. Integrated brake system never worked; had to large companies take over a year to misdiagnose it and cover with cheap replacements. $150 for a new gm originals all over weakened plastic connectors unprotected from the elements.Door handles and locks broke one by one.Tow mode offers help under the most heavy conditions only, but I can't tow without brakes. Otherwise it shifts erratically when engaged at all times on slight to steep hills. I use my pwhere I go always. Seat belt receiver on driver side jammed shut. Must buy all this or have plans on when. Both trailer and truck brakes twice changed in 40,000 miles less than half towing.
2005 HD Gas, 6.0, This is a vibration type noise in the exhaust which only occurs
when the truck has been running and is hot
Thought the muffler was bad, it raddled at low speeds, the muffler guy fixed it for $10.00 and said it was a loose piece.
rattles at idle, sometimes.
Getting popping crackling noise. Not fixed yet.
been driving with the rattle. 162,000 now still rattles lol
Fabricated new shield with better material.
Tinny rattling sound when truck in gear under load, doesnt do it idling. Dealers said it was rocks in heat shield but i know this to be not true. Dealer said noise is harmless but it is very annoying.
Makes a rattling at both an idle and while driving. Doesn't sound good but doesn't affect performance either.
Rattling muffler heat shield
Only makes the noise when someone is riding in the rear seat