Humming noise when tightly turning steering wheel, only during cold start and go?

[DenXL]

Yes they will make you drive 200 miles after fluid change to see if the noise is there.
I drove it and now the noise is worse than ever actually. New differential has been ordered but no idea when they will have one.

 

[sito1103]

My '21 Yukon At4 has been in the shop several times for this exact issue. I finally found the TSB on my own and took my SUV to the local dealer who is now saying that I am required to pay for the fluid change in the Diff...

Has anyone else been told this BS? Or is it just me? Seems to me that this is a known issue and should be covered under the Warranty. Thoughts?

FYI '21 Yuon AT4
41k Miles currently
Took it in at approx 22k, 31k, 38k, and now

 

[91RS]

The fluid change is covered by powertrain. It says so in the bulletin.

 

[sito1103]

The fluid change is covered by powertrain. It says so in the bulletin.

Yeap, at the bottom. I even pointed that out to the service dept rep. I spent 45 mins on the phone defending my position and ended up telling him that I was being ripped
off by them and he finally caved and requested approval from their service dept manager which quickly approved it. Couldn’t believe it honestly.

I believe he was ill informed and dug his heals in the ground on his position. He was clearly upset at me when I picked up the SUV.

It did seem to clear up the noise. We will see, long term, if this doesn’t lead to a new LSD.