My van will not go anywhere, I have the trouble codes, can you tell me what to fix?

My '99 Chrysler town and country is currently undriveable. The transmission will not go into gear. The trouble codes I got when it was working are P0700, P0403 and P1776. It did this once before but it made a bunch of noise and di some bucking and then wouldn't go into gear. It sat for a couple of months. We needed to move it and the battery was dead. After we recharged the battery it started and we were able to drive it without any problems. I assume that's because the pcm cleared due to the battery being dead. We have driven it for about a month or so and were able to get the trouble codes. A couple of days ago I went to drive it. I made it to the end of the street and then it did not go anywhere. I tried to put it in reverse, drive, etc. To no avail. It currently will not move. Any ideas? Should I try to get the codes myself to see if it comes up with something different? Thanks for any help you can provide.