TrademarkBB6

Whats up everyone, I bought my 1998 Honda prelude a year ago, base w/ auto trans. A couple of months in, trans died on me. Trans was swapped to P2A8 trans from an accord. Problem is now i have check engine light with code P0700 - Transmission Control System. I'm not sure how to fix this and im coming to the place I always do to get answers. I believe it has something to do with the ECU but idk. First time posting, complete NOOB right now but hopefully with your help I can gain a bit of experience. Thank you in advance.



This is what I found next to my ECU. It says AT Control Unit. Could this be the problem? and what do i need to do to fix it? or replace?