jimbowilly1960

Ok. So I'm at the GMC dealership right now, on Central Ave, Albany NY. I stopped by to take advantage of the free coffee and donuts. And this department manager is having a cow. He says your probably sitting at your table in a trailer park somewhere with nothing better to do than to follow threads/people on GMC related forums? He says GMC/Chevy trucks do not make this noise period. He was wrong! It's 25 °F. We just started up 5 GMC pickups. 3) 2017's, 1) 2016, and 1) 2018 GMC 1500 Sierra pickups. Everyone with the 5.3 liter engine. Each truck made the same strange noise upon start up. Each noise only varying a few seconds in duration. The day I purchased my 2017 GMC Sierra 1500 Elevation, I started 3 different trucks without noticing this noise. Hoping this post helps?

Yup. Same thing. More pro dominant while standing on the passenger side of my cab. This noise lasts maybe, maybe 30 seconds? Millions of these trucks on the road at this moment, making the same noise upon start up. Probably find out the day after my warranty runs out, it's some counterfeit part in my oil pan which was manufactured the Ukraine?

I just purchased a 2017 GMC 1500 Sierra Elevation. The same grinding/rattling noise comes from under the cab on the passenger side of the truck. Sounds more like emissions to me. Stops after a few minutes. Truck runs fine.