If a car is showing p0138 and p2253 what is the cause

Question

And,I will like to know this code 7e9 a/t and P0715 and p1723

Answer 1

P0715 Malfunction in the speed sensor

P1723 Abnormality in speed sensor system function

These code are basically the same you have a generic codes setting and a manufactuer specific code setting. This is for the speed sensor of the transmission,