Setting things on the seat might do it , but it could be just about anything . My 2016 3500 cummins drove me nuts for a couple months when I first got it . The service def system message would pop up stay on for abit then go away , no codes . 8 trips to dealer , even took a picture of it cause I was going crazy , but couldn't figure it out . Finally tripped the MIL and got a code . Took less than 5 minutes to fix , bad connection causing an error. Good luck cause there's nothing more annoying than the ding and trying to figure out why .