Squeak when starting

[G-Frog]

My 2021 Yukon SLT has developed a squeak when it starts.

Anyone ever heard of anything like this? Engine mounts maybe?

There is also a similar squeak when releasing the brake after slowing down quickly or when the body leans in a sharp curve at city speeds 50 km/hr (30 mph) or less.

 

[Fless]

Starter not disengaging quickly enough? Noisy pulley on serp belt?

 

[Doubeleive]

pop the hood and record in the engine area while the vehicle is started or use remote start and see if you can pinpoint it better. might take a few tries to narrow it down

 

[Holy Roller]

Starter slightly out of alignment. Easily resolved by dealer.

 

[G-Frog]

The Yukon was at the dealer today and they sent this video explaining the problem.

https://steeleauto.com/video/2/alzygrla

It is suspected that as you brake and your foot is off the accelerator, the cylinder de-activation occurs and as you take your foot off the brake pedal, cylinder re-activation occurs causing added exhaust gases and making the valve move. Same issue in curves, foot off the gas as you the approach the curve and as you re-apply gas in the curves, the cylinders re-activate.

I had a similar noisy exhaust butterfly valve changed last year on my 2018 Traverse.

Corrosion happens quickly in the northern hemisphere.

 

[OR VietVet]

WOW! 5-7 days wait for part and bet there is a recall sent out. Looks like a lot of crud under there for a 2021.

 

[G-Frog]

Looks like a lot of crud under there for a 2021.

It's called undercoating; also known as rustproofing. You can hear the tech talking about it. Looks worst than it is. The stuff that is applied on my Yukon (Formula 3000) is a clear semi-gel like substance.

It was tested by the US Army and Canadian Military some time ago. You can test reports here: https://corrosionfree.com/wp-conten...t-of-Defence-Report-Highlighted-Text-copy.pdf

In these Northern neck of the woods, they use a lot of salt on the roads during winter. If you don't undercoat/rustproof, you'll get rust before the end of your first winter.

 

[OR VietVet]

It's called undercoating; also known as rustproofing. You can hear the tech talking about it. Looks worst than it is. The stuff that is applied on my Yukon (Formula 3000) is a clear semi-gel like substance.

It was tested by the US Army and Canadian Military some time ago. You can test reports here: https://corrosionfree.com/wp-conten...t-of-Defence-Report-Highlighted-Text-copy.pdf

In these Northern neck of the woods, they use a lot of salt on the roads during winter. If you don't undercoat/rustproof, you'll get rust before the end of your first winter.

35+ years of working in the auto repair field and 10 as a tech and 25+ as a service manager. I can tell you stories about dealing with rust caused by salt. I saw rust all over the tab that was holding the spare up and as he moved around under there, he was fast enough that could not get a good clear sight on everything. One of the reasons I moved to the PNW.

 

[Vinnoto1]

8K Miles on my YUKON XL and it is squealing for 30-60 seconds whenever it starts.. Based on the above something regarding the belt is failing, has anyone been to dealer regarding this?

 

[WalleyeMikeIII]

It’s normal, likely retarded timing for catalyst light off. See here:

https://static.nhtsa.gov/odi/tsbs/2022/MC-10225749-0001.pdf