: Bought new ACDelco ECU: Does it need to be programmed?

09-20-10, 03:58 PM
My STS is shifting hard and I think the ECU needs to be re-flashed.

I bought a new ACDelco Electronic Control Unit (Part No. 12576523) because it was very cheap and I couldn't pass it up. I've checked for ECU trouble codes and don't get any. But this doesn't mean that I shouldn't have it re-flashed, which will cost about $90. Does a new ECU come already programmed? Then again, I would like to bring it to a Cadillac dealership for the upgraded software programming to see if it will solve my hard shifting problem. Can I bring the new one into a dealership without it installed and just asked that it be re-flashed?

09-24-10, 12:45 AM
Personally, I wouldn't have it re-flashed unless you have a problem.