Originally Posted by PAhonda

Try installing the old TCU and keep the new ECU. See if the problem resolves. If not, use the old ECU with the new TCU.

Originally Posted by rhanvey

Well, both ecu and tcu have been replaced. I decided to check and make sure there were no stored codes before trying to start the car. How is it possible, I'm getting the SAME d4 codes? Totally different ecu and tcu! I'm very confused and frustrated. Oh, and before I changed them out it was at least acting like it wanted to start. Now it's just making a high winding. I've touched nothing else. HELP!