Hello. I have a 91 Accord EX AT Tranny. I just got it back from a person that quit making payments to me on it. I starts out in 3rd gear and will not shift out of third gear. At 3000 rpm's I go about 45 mph. No slipping at all just feels like it is stuck in one gear. The engine light is on but I forget where the little jump thingy is to count the flashes of the engine light. What code am I looking for anyways? How do I know if it is the tranny that is bad or just the tranny computer/TCM???? Thanks.