P0773 code intermittently with no indication of trans problem is there a solution to fix this problem?

Question

every since we changed the trans fluid getting P0773 code on 2001 toyota sienna what is solution since there is no other indication of a trans problem

Answer 1

A common known problem is a  bug with the ECM (computer), an update for the ECM is avaliable that will fix the problem but it might be dealer only