Growl in 4 wheel auto

[JSB81]

I have a 2018 Denali. When in 4 wheel auto it has a loud growl to it. My dad has a 2018 slt and in 4 wheel auto you can’t tell it’s engaged. Anyone else have the described growl? If so can anything be done? 

[Mdsjohna]

I have it in 4a when accelerating.


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[Supreme Pizza]

4 auto locks in your front CV axles (engages the hubs).

That will turn many more bearings, gears, a drive shaft, etc as opposed to 2X4 mode.

 

My 2003 did the same thing as yours. 

 

My 1999 , 2000, and 2001 and 2002 did not. 

 

The sound is a little unnerving, but I don't think its a major issue. 

[JSB81]

Very frustrating to spend that kind of money and have it hit or miss. Not that I want to drive around in 4a all the time. But certain conditions I would leave it on if it weren’t so loud. Especially frustrating that my dad probably paid 10 grand less for his and it’s perfect. Hopefully it works itself out of it. I’m sure dealer can’t do anything.