I'm completely baffled. I have a 2015 with the 3.6 and was getting the P0128 code, so I went ahead and replaced the thermostat with one I got from Mopar (part #05184651AJ. Anyhow, I replaced it, burped it, etc. but I noticed the temp is only hitting 185 and staying there and the code came back after about 3 days which I can only assume is because it's too cool? Anyone have any suggestions on what I'm missing?