This happned to me this weekend. I have a 2021 5.3l with 2000km. All was fine and only thing I did was charging my phone with a 12v USB adapter in accessory port while I was working on my RV at storage site. Unplugged it whenot was charged and started truck about 20 minutes after that. On comes check light. Drove a few KM's and resterted truck 2 or 3 times before I got home. Turned off and on in drive way and it no loner is on.
Sure seems related to this thread, I did not notice any odd sounds or performance issues driving. Very werid.