I have a new 2021 AT4 Duramax. I filled the DEF fluid for the first time (it has about 2300 miles on it) When I started it to leave the station, the check engine light was on. I drove it home (6 miles) and it didn't go off. Could this be related to filling the DEF tank. I guess it's possible...

So it looks like my GMC 2500 Duramax has proceeded to event code 4300 (Intermediate shipping) The robot assistants at GMC tracking messaging system say that shipping is imminent, and refer me to the dealership for schedule. But, the dealer tells a different story. Yes, it's in 4300 but it's...