I have 2014 PM 3500 with 140,000 miles on it. It is a diesel with the automatic manual transmission. Just got it a month ago, built it into a camper, and am currently on a 2 week trip in the PNW with it. Here is the problem. Anytime I am going down hill the van doesn't seem to want to shift until it is in the 3000 - 3500 range, but when I go uphill it shifts far sooner than it should be. I turned a corner in downtown Seattle yesterday tried to go up a steep hill starting in first gear and it almost immediately shifted into second, before it had even hit 1500 rpms, and almost stalled out on the hill. I can put it into manual mode to keep it from doing this and just shift myself. But I am wondering if anyone knows whats going on. Seems like some sensor is just backwards, or upside down or something to me, but I haven't been able to find the right combination of words to google and figure it out yet.