I have an 01 1500 z71 chevrolet silverado. I can't read any codes. I had a mobile mech come by and try and hook up 3 different computers. None of them will read. I was sitting in the driveway and it died on me. I waiting 20 minutes after trying over and over to start it. Finally it started and acted like nothing happened. Now it's just been sitting cuz I don't know what the problem might be. CEL IS ON. Also it'll crank and sputter out. I don't know if it's the ecm or not so I ordered a new one.