So usually when cold and I first start the van everything is fine... but if I stop after that the transmission will be in limp mode which after sitting for a minute or two I'll see a quick flash on the check engine then everything is fine again...some times it takes longer and when tired of waiting I have to manually start in first then shift to drive when at 25 mph...5 minutes later the dim O/D light goes out with a little shift hiccup in the trans and things are fine till I stop again...rarely will it go to limp mode while driving...in day time the way I check to see if it's in limp mode upon starting is tapping the O/D button...the O/D light won't come on if in limp mode....The code reader I have never shows any codes... oh how I wish I had a manual transmission