01 durango p0700 code!!

[tumper93]

I have an 01 durango with a 4.7l and 45re transmission that is setting a p0700 code, trans error. Has anybody run in to this code before? I read there is a flash for it but not sure if it will fix my no 3 or 4 gear problem. It will shift to first and upshift to 2 but has NO third gear. It broke down on my wife last night 150 miles from home and now I need some information please.