Originally Posted by
TheMechanic
The communication "U" code is likely the result of the TCM being bad. As Robert said try unplugging the trans harness and see if you now have a gear. If you do the next step is to plug the connector back in and attempt to communicate with the trans. I use Data Bus Diagnostic Tool. It will tell me right away if a module is to giving a state of health message. A scan tool that will directly communicate with the trans should be good enough if you didn't do anything wiring related and ALL power and grounds check out good.
Knock it off with the newbie crap though. Everyone on here does not pick on new people. They will pick on someone who comes in wanting everything done for them for free, is ungrateful when they get that help, and feel entitled to head of the line privileges. So as long as your not a dick you will get the help you need.