OK I AM STUMMPED I AM ALREADY 1800$ INTO THIS PROJECT AND STILL HAVING TROUBLE. I HAD THE TRANSMISSION REBUILT AND EVERYTHING SEEMS TO BE FINE UNTIL THE CAR WARMS UP TO OPERATING TEMPERATURE THEN THE DANG D4 LIGHT STARTS FLASHING. PLEASE ANYONE KNOW WHAT COULD BE CAUSING THIS? I CHECKED THE SPEED SENSORS EVERYTHING IS CONNECTED.

 

What codes are stored? That should point you in the right direction.

 

D4 light flashing is usually a transmission problem. Also you probably have an issue with your keyboard too, the caps lock or shift buttons seem to be stuck down. Better check out that first, might be related to your d4 light flashing.