DaveHC

Ok I contacted my dealer and told them about the popping sounds and that GM had a new bolt kit that was supposed to be used when the spoiler is removed. My 2020 was built in October 19, and under went the leak repair, so they ordered it and pulled spoiler and put back on using new kit, I didn’t see it or old bolts so don’t know what is different but my spoiler was popping a lot but temperature was hotter and it didn’t pop as much when colder. So far I have only heard a few sounds that could have been a pop but nothing at all like before but I won’t really know till it gets hot again but so far it seems to be working. I would suggest bugging the dealer to do the new bolt kit if you are bothered by the annoying popping. If they pull the latest TSB on window leaks it talks about replacing with new bolt kit.

looks right, pop off a cover on side of dash with door open, fuses on both sides and even some spares are there

check your rear window, they leak like sives on these trucks, search in this forum, over 150 pages of stories, mine leaked so bad i found out when i started up a hill and heard water moving, all carpets soaked front and rear. check your carpets

its a warning the remote is in truck with two beeps, but could beep different with the second remote inside too.

i bought a blue gel cushion on amazon for 23 bucks that works good has black cover, it sits in middle of seat between bolsters one way if you turn it sideways it sits across whole seat, and helps me alot. brand was Cclub thick egg seat cushion 22.98

Could you please tell me what size tool is needed to remove or tighten spoiler bolts, my 2020 denali with rear mirror camera pops like crazy if temp is 85 or above the hotter the more it does it, mine had the spoiler removed to fix the rear window leak, do not ever remember hearing it before that. leak is fixed so not sure i want them messing with it but i might take a look myself.

Could you please tell me what size tool is needed to remove or tighten spoiler bolts, my 2020 denali with rear mirror camera pops like crazy if temp is 85 or above the hotter the more it does it, mine had the spoiler removed to fix the rear window leak, do not ever remember hearing it before that. leak is fixed so not sure i want them messing with it but i might take a look myself.

drove me crazy in my 2019 gmc 5,3 8 speed, left at dealer overnight several times, same answer cant duplicate issue, i even paid for the trans fluid change to the new stuff but didnt help. got sick of it traded it in for 6.2 10 speed

same here has happened twice, turned off truck opened door then restarted truck fixes it, its a xm radio glitch imo

lane change alert

Update, Denali ultimate 2020, 1320 miles leaking rear window, water intrusion so bad all carpet front and rear totally saturated with rain water . After my truck being at dealer for a month i got it back, leak fixed, my leak was different it from the rear defrost wire being caught under the window frame driver side and it had a hole in sealer size of pencil according to the leak specialist my dealer used to fix it. Now the rest of the story, for you guys who think its a easy fix well the actual leak is but the problem Is if they have to replace carpet or drop the headliner like they did in mine they gut your truck, to drop headliner alone means every corner pillar front center and rear has to be removed along with the back seat. My truck doesn’t leak but the inside is scratched and scared and many parts broken like the fastener covers and line up pins on rear corner covers and on and on. My dealers tech must have missed how to properly remove and replace trim. Dealer ordered some replacement parts but I didn’t want the rest of the truck where they scratched side of dash and other places torn out so I guess I’ll live with them. I also have rattling and pops and cracks from where everything was taken out and put back in. So to me the fix is almost worse than the problem . I opened a case with GM to have it on record but as of now have not been offered anything as compensation for all the trouble or imo diminished value ot my truck. If you’re thinking About buying a GM truck I would hold off till this problem is addressed at the factory. I feel for all going thru this ordeal

from what I have read, resonators handle the drone, cans on 6.2 and screens on 5.3 do the same job of cancelling it out on the stock exhaust, most cat backs don't have them and many say no drone so not sure how it works on them.

better check the 2020 if they offer you one my 2020 denali is at day 22 waiting on backorder carpet,rear window leak repaired by what seems to be a competant expert but only water will tell

3 weeks at dealer, said issue was rear window where defrost cable went in, void in urethane the size of little finger, repaired and said no leak now, waiting on new carpet to arrive.

leaking 2020 denali, but my carpets in front were soaked rear was wet driver side and damp passenger, been at dealer 8 days so far they say they gutted interior and ordered new carpet and resealed back glass but my truck had most of the water in front and I could even here it slosh back in forth when stopping or starting off and sounded like from front rockers or under dash. has anyone had success with the rear being resealed?

would like to know this too. thanks

got my mf 12909 was going to have it installed but big rain soaked my front and rear carpets so its been at dealer since Monday,

look at the dual purpose Kawasaki, think its a 650, son had one very capable on and off road

My truck 2020 denali 1300 miles had for 5 weeks is at dealer for soaked carpet front, driver and passenger and behind driver behind passenger is damp but not soaked, plus I could hear flowing water when stopping and starting off. dealer called said rear window was leaking and was resealed will test tomorrow to see if fixed, also leaking from front and they will try and find it next. has anyone who had a reseal had it be successful ??? Its looking like a lemon law case might be in my future

Just a heads up, my 2020 denali built in usa is leaking from the front I think, had radio off the other day and heard water flowing as I stopped, and again once I started off, being my truck had all weather mats I never knew till I raised them up I had soaked front carpet both sides and even the rears were damp. At dealer now, a water intrusion specialist (their words) is coming tomorrow to check out and hopefully fix it. never washed yet a little over 1k miles and 6 weeks old. we have had severe rain several times. fyi.... I read gm does not water test every truck, they only do a random selection and test from the assembly line.

My 2020 is totally wet in flooring front and rear water sloshing in rockers too. Its not coolant just rain water bad storms here last few weeks, going to dealership tomorrow I’ll report back with hopefully some useful information

Found info on 2018 and back but nothing recent on swapping muffler on 19-20 6.2 , DFM, im not interested in full system. Just if flapers can be removed without having drone with the DFM system

So I want to switch out my stock muffler 2020 6.2 , leaving everything else stock ,after much searching sounds like a magnaflow 12919 or a dynamax non chambered muffler will give me the deep sound I want, but flapper on or off is undecided because of no clear info on drone. I don't wanr drone, so if I delete flappers and get it I have to put back in. is there anyone who has found a way to keep them open all the time? and then have them be closed back stock if need be? Also im unclear as to what type resonators my truck has, ive heard something about mesh? Im somewhat handicapped and haven't been able to get under truck to inspect for myself. thanks for any input on any of this...

Any updated info on those just doing muffler swap, did you delete the flappers and if so is there drone? Im only wanting to change muffler to a non chambered magnaflow 12919, this is for a 2020 6.2, looking for more straight thru design muffler with deeper sound and no drone. Muffler delete in person to me sounds terrible, to loud and raspy plus ive been told it drones like crazy

Just got my 2020 Denali in this color, still getting use to it after coming from white. They should have named it Titanium imo.