WayneF

I have the same issue with my 2020 Silverado 2500 HD. As soon as you start the truck, the volume goes down to 2 bars on the phone and will stay that way until you disconnect from the truck and manually raise it. I have an Iphone 8 plus but my spouse has an Iphone 11 Pro Max and it will do the same. I have started a case with GM but keep missing their calls because it seems they call when I am in truck and cannot hear it. You have to notice the screen on infotainment system to see if someone is calling. I also have a problem with the system when I make a request to call someone, it will say, "unable to locate a phone", "please pair a phone and try again"! The phone screen shows connected but it won't find it. It also has "dropped" contacts for no reason, navigation just cuts off for no reason and then (we listen to a lot of XM) it will sit there and say that it is trying to connect to satellite, but FM stations, bluetooth music on phone will all play but XM won't connect! I even have an iPod connected to the USB inside the console and sometimes it will connect fine and other times it says, "SDM card not working"! We have had Chevrolets since the early 1970's but that is about to come to an end. Yes, I have carried to dealer only to hear, we know about it but it has GM puzzled too. We have tried everything listed on forums to fix but nothing! Disgusted!