Shafutz

Early model 2015 2.0 hmi very frustrating following cant wait

Hello All, I just picked up a 2014 sierra slt with max trailering package. I just pust put my first 50 miles on it and when i am coasting I hear a loud low pitched whinning almost a hum. When I give the truck power the sound goes away. This happens from speeds of 30 miles per hour and up. Voice link is a little glitchy. It will stop working randomly and when I restart the truck it works again. Other than that the truck is fantastic