6.2 man

Well , my truck has been at the dealer for a week for the engineer to look at the chirping noise and also all kinds of electrical issues .Blank screens,flickering dash,very slow connection to answer a phone call ,climate controll ,trailer brake service promp, they made a 3 minuite video of the chirping noise and sent it in to be diagnosed.

The dealership has diagnosed the noise to the exhaust flapper but will not order me a new exhaust,they are waiting on a engineer to come in but say he is very busy and it may take a while,well its been about a month and a half with this and no thing has changed,I have repeatedly asked them to order me a exhaust but for some reason they will not.

I still have a chirping noise upon startup of the truck. 2019 GMC Denali 6.2 , sounds like a fan belt or serpentine belt but im told its in the exhaust valve built into the exhaust system. GM has told the servicing dealer who by the way has been GREAT to deal with that if they can find another truck to make this chirping noise that it is supposed to be like that. I told them NO ,if another truck makes a chirping noise that means they have 2 trucks that have a problem. I have requested to have the exhaust replaced and to speak with a engineer or regional representative to find out why they refuse to fix this issue .it has been well over a month but no response from GM ,This is becoming VERY annoying to have to spend this much time to fix a brand new vehicle with 3000 miles on it. Where is the service after the sale from GM .Things break,I get it ,just fix it already. Sorry for the rant everybody

I think your right on the exhaust flapper , mine does it but my buddies does not .

I have a new 2019 denali 4 door 6.2, it just turned 2,000 miles and it has a chirping noise under the hood at start up most of the time.It sounds like a belt making noise and lasts for about 30 to 45 seconds .Took it to the dealer and they are saying it is in the exhaust and that GM is stating that it is normal. I have owned a lot of vehicles over the years and never had one or heard of one thats supposed to chirp for a while when started. Anybody else notice this also