BO TIE 1

Seems like you've checked everything but I didn't see anything about the fan.

Have you recently switched key fobs? They are numbered one and two. If you originally saved settings to the one fob and then use number two it won't recognize your settings. If that's not the issue then disconnect the battery and then reprogram your settings. Hope this helps.

Try sending a refresh from Sirius XM website. Hope this helps.

Not sure if this would help you but on my 2018 Silverado I was getting the theft deterrent message and truck was still starting fine. Then after some weeks my alarm started going off randomly. I ended up changing the hood latch and all is good since. By the way I had a hard time finding a new one so others must have been having same issue. Hope this helps you. Good luck.

I had this issue with my right turn signal on my 2018 LTZ. Luckily I was still under warranty at the time. Unfortunately the whole unit needs to be replaced. You could check and see if you can find one on line and replace it yourself wouldn't be that hard.

Glad I could help. Hope you get it all sorted out. Good luck.

Did you try turning off the park assist in the vehicle settings?

https://www.ebay.com/itm/NEW-52050133-For-GM-PDC-Parking-Sensor-Bumper-Object-Aid-Backup-0263023352-/322459690005?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l6249&mkrid=711-127632-2357-0

Beside the road force balance I would get a 4 wheel alignment.

Do a Google search. Plenty of gm owners with same issue.

A sign of warped rotors is pulsating in the pedal so it's a good chance that's what happened. Take them to a shop that cuts rotors and hopefully there is enough meat on them to cut. Good luck.

When I had my 2014 Silverado I had a few lights out. They had to replace the whole unit.

Possible the previous owner had a tune on the truck. Might be tuned out.

Try disconnecting the range and see if that's the problem.