Thread: Reduced Engine Power

Hello everybody, well im new here but i dont have a grand prix. I had a question about my brothers Grand Prix. He was having trouble with it because sometimes it didnt wanna start. We ended up taking the battery to autozone and it came out bad so we changed it out. But now theres message saying that it has Reduced Engine Power anyone know what that means and how to fix it?? Any help would be apreciated.