Since purchasing the vehicle on 7/28/23 and driving off the lot, a very distinctive irritating vibration noise coming from the area in from of the passenger seat either inside the dash or just in front of the dash. Perhaps where the cooler and heater pipes penetrate the fire wall. Seems to be a common problem with these 2017 Sierra Danali 2500. It has been back to the dealer twice now with same result, we can't find the problem, bring it back on the 23rd and we will work on it again. If it can't be fixed soon, I want to get my money back from Weston Buick GMC. It had to be known by them of this problem before they sold the truck to me. Was originally purchased from them by another party in 2017 and possibly traded it in because of the noise.

I need a fix or take the truck back. It's not drivable the way that it is, the noise is just too much to ignore.

Update from Aug 16, 2023: I found the problem was where the air conditioning coolant lines went through the firewall, it was metal to metal. I zip tied them together and the rattling has gone away at least for now. I've driven about 60 miles since I did this and no vibration at all.