2021 Yukon strange sound in park

[Amfm]

just don't stand in front of it if you are parked on a incline, witnessed a relatives 21 parked on a boat ramp, parked and parking brake set and it radomnly decided it wanted to lurch forward on it's own about a foot. I will never trust those buttons.
he was already in the process of lemon lawing it but holy crap man!

Far far far too short of a video, also while recording try sticking your phone under the vehicle and move it around under the passenger side engine area and then behind the front passenger wheel and move towards the transmission and then back forward again. the mic on the phone can help determine the noise source.

well I will I had access to the car but it’s currently sitting in the shop ripped apart

 

[Doubeleive]

ya the noise in that video could litterally be anything and the newer trucks make a lot more "normal" noises than the older ones

 

[OR VietVet]

Actually you'll want to upload it to a hosting service.

Then we can download it from the link you post in the thread.

Whatever!!!!!!

 

[Amfm]

Here is another video

 

[Doubeleive]

Here is another video

I guess that could be the transmission, don't know of anything else that would sound like that

 

[Fless]

Whatever!!!!!!

Just a wee bit o' difference between the two.

 

[OR VietVet]

Just a wee bit o' difference between the two.

Not to a 70, almost 71, year old that is tech challenged at times. Let's Go Brandon.......

 

[B-train]

That sounds absolutely awful. I'd probably go with transmission as well based on what @StephenPT posted for that TSB. Hopefully they find it and fix it for you. Best of luck, and report back when it's fixed for our knowledge base here

 

[Gearz]

You can hear the pump whining while the grinding sound is happening. The transmission sounds like it cavitating like air is in the pump. UGH very disappointing!

 

[PaulGA]

I’m having this same issue now in my 22 with 17k miles. I’m at the dealer now actually. Hoping good news when they bring it back out.