Can someone please help me? I have a 98 Honda civic ex that has a flashing d4 on the cluster which also thru a check engine light. I took my car to smog and the result shows a p0700 code. Trans ctrl system malfunction. The car runs fine, just that I think I don't feel the overdrive working. Does anyone knows how I can fix this so that I can pass smog? I hope I don't have to replace a new tranny. I hope it's just a sensor gone bad. All emission pass except for the check engine light.