hey guys im curious if anyone has ever had this problem happen not just to a grand prix but any car for that matter. Before i was able to read the codes in my gtp with my code reader and now all of a sudden it dosent come on at all? I checked my grand am and it works on that just fine so im stumped as to what is causing this? Any advice on what i could do or check for would be great as i dont know much about wiring on cars. Thanks!