2015 caravan transmission problem

I have some questions i we replace a transmission to my caravan and both a use one. Ones its done i check the fluid and add a litle i watch couple of videos on how to measure it i both the dorman dipstick one i fired it up there is a code p083b. And p0944 and even you put it into a drive van wont move just askin for your opinion if i got a bad trans thanks