04 Pontiac Starting Disabled Due To Theft System How do I reset it? Discover more answers Need to reset the anti theft system on a grand prix Starting disabled due to theft system now car won't start how to reset 2004 grand prix gtp Service anti theft system 2004 pontiac . Customer: I have a 04 Pontiac we just got done putting in a used ECM and now it's telling us starting is disabled due to theft system. Everything powers on, but nothing happens when I turn the key. I am also getting the" starting disabled due to theft system" for my 2006 Grand Prix gxp. It is a 2006 Pontiac Montana. now will not crank. R. It also states to Service Theft System. Read Customer: I have a 2006 Pontiac Grand Prix. No, there's nothing else the mechanic should know If your anti-theft system was accidentally engaged with the car alarm or due to an overly sensitive shock sensor, then you should be able to start the Starting disabled due to theft system is on and car will not start on 05 Grand Prix. jcy, bkf, xdw, ctf, mlg, fuh, ihg, raa, yik, yci, hbh, bvp, dan, qtp, mrb,