Quote Originally Posted by BillBoost37 View Post
When you are trying to read it, have you already turned it off and then tried to grab the codes? Most trans codes won't kick the CEL on and reset with the ignition switch. I often suggest, getting the trans to behave badly and not shutting off the car before reading the codes.
It acts up all the time, not just here and there so there is no getting it behave badly, lol!