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About Turtlern56

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  1. i know on the GMC build site with AT4 premium and technology packages with BOSE system included and here is what the description says if you click on it. May require additional optional equipment See photo. So I just figured with the Denali the woofer was under the seat standard because it has no such description on its build site. Also window stickers are different. Again both are Bose systems pic 1 Bose Description on Premium AT4 build pic 2 Denali pic 3 Loaded AT4 so I really don’t other than my AT4 doesn’t actually both say may require additional equipment so maybe just an extra add on on both trucks Idk. Wish mine came with it.
  2. The AT4 HD doesn’t include the subwoofer with premium Bose sound package. 6vs7 speakers if I recall correctly. I know my AT4 HD didn’t. In fact the Rear speakers are barely Even audible. Definitely plan on adding the woofer. Badly needed.
  3. Today I seen another 2020 Denali in an empty parking lot and I parked about 3 spots away. Turned my truck off cracked the windows and it was running. We could hear same knock on that truck but wasn’t terrible loud but even my kids could distinguish the sound. I agree on the air thumping sounds (Compressor like) Especially sitting in the truck with the door open or window cracked. My truck now has 1000 miles on it. In the mornings with a cold remote start it will do the same knock for a split second Just Enough for 2-3 knocks then quiets down for a minute or two then comes on strong. Once the truck has been running for 5-10 mins it knocks obnoxiously loud. Driving us crazy! 500-1300 rpms or so it’s very audible. Knock knock knock knock I hear it in my sleep. Lol
  4. I have a 2020 AT4 HD 400 miles now and mine has made that exact same knock as the video outlines. I commented to the salesman about it but he said he wasn’t that familiar with any of the sounds. I had been waiting a month for delivery bc of the GM strike. I went back to the dealer the same day I took delivery last week and made them start another diesel and it had same knock but not near as loud as mine. Heard three others since with no noise. It’s Horrible at idle and seems to go away about 900-1000 rpms. Some mornings not audible for a minute or two then comes on strong as it warms. Service manager today says it’s normal and they printed me off the ticking service bulletin. It’s a knock not a tick. He also told me to drive it and about halfway through oil life if still audible then they might investigate it. It’s a little embarrassing I’ve had a couple people ask me “what’s that knocking?” I give them the $70k shrug and say it’s normal. Lol. I hope they figure something out. Reprogram an injector if it’s like a fuel knock or something. Found this thread researching and thought I would chime in.
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