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Hey everyone, So i just purchased my first Silverado used and immediately the gf and I notice a high frequency noise. The truck is a 2016 LT and when I test drove the truck we noticed nothing odd. after the salesman gave me a rundown on everything and how it works. He then put the truck in 4x4 auto and was explaining the 4x4 stuff and then onto onstar. We left the dealership and immediately turned around and asked for him to hop in. He witnessed the noise and scheduled service to fix the problem. They gave me a bulletin for the transfer case and claim that is the noise when the transfer case is running. it sounds like a high frequency electrical noise. I have tried searching the forums and internet with no luck. I'm ready to try and just purchase a new switch and see if that solves the problem. any thoughts or advice would be great. When I put the vehicle in 2H I get zero noise from switch, when its in 4Auto or 4x4 then you can here the noise come and go randomly.