I upgraded my charging module in my 2015 Denali, GM came out with an update/upgrade module for the pre 2018 wireless charging vehicles. My good friend is a parts manager at a local dealer near me and he gifted me with one after I helped him fix a couple of things around his house. For reference here is a link from GM parts direct. It took me less than 10 minutes to swap it out and it works flawlessly with my iphone X
https://www.gmpartsdirect.com/oem-parts/gm-f-module-pkg-84526978
https://www.gmpartsdirect.com/oem-parts/gm-f-module-pkg-84526978