What do i need to check transmission control module for codes, i know i need a scanner but will the scanners at the auto stores be enough?

i went to auto zone and they ran the codes and it was p0700 i know its a transmission code but i cant tell what its wrong with it. i have a 2002 dodge neon and how do i find out what the transmission code is, im broke i cannot take it any where that costs money and it wont shift so i cannot drive it

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