Great news you got the truck back fixed and covered under warranty.
But your story rings sooo true as to the absolute incompetence or maybe red tape, not sure which that is present.
Heck I don't even own one of those trucks, but a couple hours of google ing and a week waiting for parts ordered and couple days in the garage with a case of beer and I could have fixed it at home. Yet your dealer took a month...
Similar story, my 2016 Chevy work truck had a trans issue. Short story, it was covered under warranty and fixed.
Long story is they gave it back to me after a month, NOT fixed and somehow I might not notice that it slip out of gear and into neutral every time you come to a stop, lol.
After 2 months total, 3 attempts to fix it and 2 different loaner trucks because I put so many miles on the first one they swapped me into another new truck so they could sell the first loaner, I got the truck back.....and put about 9 k miles on their loaner trucks.
No wonder vehicles are so expensive. They could have rebuilt or swapped the trans for a new or rebuilt unit the first time, in about a week.
This faux pas literally cost GM $thousands in additional costs and depreciation.
