transmission in limp mode
 

hello everyone, i'm from Panama, so my english is not perfect, i'll do my best to explain the situation.our car is in limp mode, this is the second caravan we own, it's a 2002 dodge caravan 3.3, my husband overhauled the transmission recently, but the car won't go out of first gear, it has reverse, but when it's supposed to go in second gear it begins to slip, and we have to shut it off and start it again so that it can move. the thing is we got codes p0700 p0732 p0734 from our bluetooth scanner, and from a mecanic scanner we got p1790 p0944 p0732. so we replaced the pump, it was actually broken inside, put everything back together, but the problem persists. it throws p0700 p0732 p0734 , the mecanic hasn't come to read our car yet. but i want to know whats going on. my husband knows how to overhaul these kind of transmissions with success, he did it before with the other car , and worked perfectly. could it be an electrical issue? all help would be greatly appreciated. thanks for reading