the free scanner from a parts store will pick up trans codes.

t app also reads codes, and theres cheap under 20 shipped scanners that work just fine too. i have both of those. running and waiting in line then dealing with a fool and a scanner gets old. so bought my own.

the scanner i got http://www.ebay.com/itm/U480-OBD2-OB...086791&vxp=mtr