Not really something for a do-it-yourselfer unless you have the underlying code. P0700 is a "general transmission fault" code. There is a code under that which can be found by a DRB-III scan tool. If you can find it, you'll know what to fix. It could be as simple as an input sensor for the transmission, or as complex as replacing a mechanical part inside the transmission. The code will tell you where to go.
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