I took my 18 2500hd in today and got told the 4wd actuator is going out on the new trucks like crazy. I was told it would take 2 days to get it in. So be ready for the 4wd light to come on
I have an 18 2500 with the DMAX, currently having the same issue. Truck has 34k miles, and didn’t have any issues until last oil change at dealer. I assume they did an update and a week later the “service 4wd” message came on. I have an appointment at my local dealer tomorrow and will let everyone know what they say.