There are other codes like p0071,p003a,p2263,p0071.
The mechanic said I need to buy a new TCM bcoz of the error code p0700,how true? on 2010 Ford Focus
With the limited info you have I cannot say one way or the other. It appears some of those codes do relate to a electronic transmission controls faults but without deeper diagnosis no way to tell. A tech needs to do more than pull codes to compleat a diagnosis.
poss under warrranty with the dealer,call them 1st