A bit of new info for the thread. I added a UCQ (Canadian version of UAQ) to my 2015, 5.7l 6-Speed with HVAC Module 6183973AC. Had problems with Backup Cam (which started working after 24 hours) and Temp Sliders in Climate would jump Hi/Lo but nothing in between and Display Units on EVIC (some in metric, some in imperial). Set my HVAC to Single Zone ATC for days, and it did not help, issues remained, but I left it in SATC and then upgraded the UCQ's software from 22.64 to 28.3 with the UCQ files from
@Mpgrimm2 post #2 :
Mpgrimm2 backup of the 8.4 files, UCQ file list. Hooked the truck up to a battery charger and left the truck in "run" mode (but not running) to do the software update, after it completed and it rebooted, I saw a few more items installing on the radio screen (USB had been removed after the initial software update completed), after all that finished I cycled the key, and about 15 to 30 minutes later, the temp sliders started working properly. I went to the Units setting and selected Metric, and the EVIC problems appear to have gone away. I am going to try the 39.6 ICQ update, and I will give the 40.1 a try even though it says "UAC", but it is in the UCQ file list. Everything appears to be working, but if anything changes after those last 2 updates, I'll post any new info.