I have a 92 honda accord and ive been having this occurring problem. I was driving one day and my car was fine, tuned it off ( for about 2 hours) then went to the store. Was in there for around 10 minutes then started my car and BOOM. Its like my tranny was stuck in second gear. Looked around and found out it was called "limp mode", in place as a safety net so you dont blow out your transmission. Well ive checked everything, replaced the capacitor ( cause the old one leaked). And it did great, until I turned the car off. I have no clue what else it could be. Ive checked the soleniods and they look fine. And the d4 light has never came on since ive had the car.