I bought a new 2021 GMC Sierra 1500 AT4 Diesel yesterday and after only having it for not even 5 hours, I went to park in my driveway and had a message "Shift to Park" after shutting it off. I had it in park so I thought maybe it was just a fluke so I turned it back on drove around the block. Came back shut it off and the same message popped up again. It does not turn the dash off so I was concerned that it would drain the battery. I took it back to the dealership and left it there for the weekend and hopefully on Monday they can tell me what happened. They informed me that they never had this issue before... I am wondering if anyone else out there has had this issue?