FishHuntRepeat

Check your pinion seal for leaks.

Think I found it, there is some insulation between the door and engine compartment, it was twisted sideways and not really where its supposed to be. I can reach around and feel some loose fuzz. Just a heads up it was wet, had mud and pine needles at the bottom of the door....good place to keep an eye on for rust. I live in pretty heavy pine trees so they gathered there.

You may be on to something.....I looked at the front of the liners but didn’t reach up behind them, will check out in the morning. thanks,

So my daughter has noticed a pine squirrel going to the AT4 and running off with black insulation while I was out of town. Saw him today and he will no longer be able to do it....I found some of the insulation but cannot find where he was getting it from. There was chewing marks all over the hood insulation but it doesn’t match, sounds like he made multiple runs. Figured maybe someone has torn in to there truck enough to help identify where it is possibly from? Some kind of sound deadening?

Picked mine up today, they couldn’t fix the noise....they could repeat the noise but couldn’t repair. Here are the notes. They started aTAC case and I asked how to check in on any progress, they told me it was internal with GM and they would update me when there is information. Upside....they aligned my bed and it looks better.....down side they scratched my door and it has to go back to the body shop

Dropped mine off today and could recreate the noise for the service manager, he heard it so maybe I will get some traction. i was checking out some of the trucks on the lot and man a lot of the beds are misaligned. I will update when they get back to me. The loaner I am driving makes the same noise just not as loud.....I'm dreading the call that this is normal for the 6.2

I am dropping mine off next Wednesday to take another shot at the squeak. I am also missing some paint on the tailgate when you unfold the step so hopefully they can take care of that to....and the bed alignment.

Thank you for the update, i believe this is what mine is doing also. I can put it in gear and hold the brake with light throttle and get the chirp to show up. Now that it may be pin pointed I will try and see if i can track it down to the PCV. I am curious if this is the same noise that I have on start up that takes 30 seconds or so to quite down. I will try to attach a video.....you can hear a tension-er/belt type noise until near the end and then it just disappears .....does this every time i start it after sitting for a couple hours and it doesn't matter if its hot or cold. IMG_1441.mp4

Thank you for the update.....I'm waiting to see what they tell you before I make the trip to the dealer.

Just an update on mine....we are pulling the travel trailer on a trip and it seems like its getting louder when we cold start and I can hear it now on the highway between 1000-2000 rpms. 6,2 10 speed also. It sounds like we have the identical problem. Once its warmed up I can hold the brake while in gear and get it to squeak. On another note we are pulling around 7000 lbs and it has exceeded my expectations...we have pulled some good grades getting into Oregon. My last truck was the LMM d-max so i was concerned about going back to the gas motor but I am impressed with the 10 speed and power. 10.8 avg MPG

I have the exact same noise, belt/pulley noise that is present after I cold start. It's there for 30 seconds and disappears.....it's driving me nuts. i took it to the dealership last week and they could not duplicate the noise, hopefully this will get figured out. My nearest dealer is an hour away so its a pain to get it over there and wait.