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-   -   14’ GMC SIERRA 1500 6.2L intermittent rattling accelerating (https://www.truckforums.com/forum/chevy-silverado-gmc-sierra-forum-11/14%92-gmc-sierra-1500-6-2l-intermittent-rattling-accelerating-23055/)

BIGNickHenry May 10, 2021 03:44 PM
14’ GMC SIERRA 1500 6.2L intermittent rattling accelerating
 
I have a 2014 GMC Sierra 1500 SLT double cab with the 6.2L. Recently noticed a hollow sounding metallic rattle. Almost like a vibrating heat shield. It is very hard to reproduce; however most commonly occurs after truck has been running for some time and goes from 0-30 mph. If you let off the gas when it’s occurring it will stop but usually only last for a couple seconds anyways.

I’ve checked all my heat shielding, U joints, exhaust mounts, and other obvious things you could just by getting under there and inspecting things. Differentials should be good; I changed oil and inspect a few thousand ago. Popped the 3/4 socket plug out and stuck finger in and still nice and golden without a bunch of shavings. My only guess could be a catalytic converter perhaps that when heated will rattle some? The truck still drives great no slipping of gears or loss of power when this sound occurs.

VIDEO OF SOUND:

alfuller72 Jun 29, 2021 05:54 PM
Sierra 6.2 Rattle
 
Originally Posted by BIGNickHenry (Post 88083)
I have a 2014 GMC Sierra 1500 SLT double cab with the 6.2L. Recently noticed a hollow sounding metallic rattle. Almost like a vibrating heat shield. It is very hard to reproduce; however most commonly occurs after truck has been running for some time and goes from 0-30 mph. If you let off the gas when it’s occurring it will stop but usually only last for a couple seconds anyways.

I’ve checked all my heat shielding, U joints, exhaust mounts, and other obvious things you could just by getting under there and inspecting things. Differentials should be good; I changed oil and inspect a few thousand ago. Popped the 3/4 socket plug out and stuck finger in and still nice and golden without a bunch of shavings. My only guess could be a catalytic converter perhaps that when heated will rattle some? The truck still drives great no slipping of gears or loss of power when this sound occurs.

VIDEO OF SOUND: https://youtu.be/9mdYMsc1mqc
Hey Nick did you ever find the source of the rattle in your Sierra? I am experiencing the same issue and searching for answers. Any input is much appreciated. Thanks

justinre Jul 14, 2021 03:46 PM
Exhaust
 
Originally Posted by alfuller72 (Post 88172)
Hey Nick did you ever find the source of the rattle in your Sierra? I am experiencing the same issue and searching for answers. Any input is much appreciated. Thanks
I have been having this same noise for over a year. I should take it in, but I dont want to spend hundreds to troubleshoot it. Please tell me someone found out something on this. Mine sounds just like this.

justinre Jul 14, 2021 03:48 PM
Have you figured anything out?

alfuller72 Jul 14, 2021 06:30 PM
Resolution to Rattle
 
Originally Posted by justinre (Post 88188)
Have you figured anything out?
I added a tube of shutter fix to the transmission fluid. It worked immediatly. I havent had any issues. Everything is nice and quiet.

Jwilly1763 Nov 26, 2024 03:35 PM
Rattle
 
Nick, I have the same rattle. I've had various exhaust pieces removed and replaced by pipe: flex joint, small converter, and the flap door behind the muffler. No luck. Did you find a fix for yours?


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