Is there a reasonably priced scanner that will pull transmission codes. Even though truck seems to run fine, I am a little worried. I have a 1996 F150 with an EO4d transmission. Truck has 280k miles on it. Overdrive light started blinking a week ago. It does it when first started then quits after truck warms up. I have an OBD scantool, but it wont pick up transmission scan codes.