High Pitch Noise AWD Mode(Non Mechanical)

[YEGbluesilverado]

I have the same high pitch noises too, noticeable in auto 4wd.

[Jordan Mason gm]

So glad I'm not alone! Love the truck other than that, if you do replace your switch and it solves the issue, I look forward to hearing about it thanks.

[Anthony Martino]

Chiming in here.. I have the same exact issue on my 2014 1500, the dealership replaced the TCCM a couple days ago and it didn't fix the issue. They called GM technical support and apparently there is a newer TCCM as of 2018 to replace it with. They ordered the new one and currently waiting to hear back if it solves the noise.  

[Aaron Wesley]

I have a 15 suburban and it has the noise. Haven't found a solution but it has been like this in the state of MN since I put it in auto awd. I will switch it out today and see. Email me if you found a solution. [email protected] -Aaron