DLB

Went back to a pickup. 1/2 ton Silverado. I do a fair amount of towing and the booming sound seemed to be amplified with a trailer attached.

Traded in our '15 Yukon XL today. No more booming.

Took mine into the dealer this morning and drove around with a tech. His words: The low speed booming over bumps is due to the fact that the sound of the rear suspension has to go somewhere and it resonates in the cab. I've only owned pickups before this Yukon, so I couldn't argue with that. He then said the buffeting sound is simply due to the aerodynamics of the vehicle. Wind bounces off the roof and side panels of the vehicle causing the booming sound. He said that it may get worse depending on weathers conditions, temperature, etc. I explained that it gets considerable worse while towing my car hauler at speeds around 40-45 mph, but he didn't really have an explanation for that.

I've been following this thread, and other related threads, since the beginning. After owning our Yukon for a year, we have realized that we're not going to get used to the noise. I had my dealer fix all the recalls last week as well as the shifting seat (they replaced the entire seat frame). They asked me to bring it back tomorrow so I can take a tech for a ride and point out the issue. I've spoke with GM customer service a few times recently and they encouraged me to continue taking it in until they can figure out how to fix it. One of the CS guys I spoke with said it's going to take a lot of phone calls, from a lot of people, before GM will really focus on this issue. He didn't come out and say it, but I got the impression he was aware of this problem. So everyone needs to call GM customer service as much as possible. On a side note: I notice this noise is amplified at least twice as much while towing my trailer. Does anyone else notice this?