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Most likely your computer theft system has set a failure code & disabled the system.First I would check the battery condition .By this a I mean does it have enough stored power to start & operate your vehicle.The battery should be load tested to make sure it is good. A poor connection at the cable connection can cause this problem.To inspect this the cables must be removed at the battery & inspected for corrosion & burns.If corrosion is found ,replace battery & cable,not just the end of the cable.If not the power supply try to relearn the theft control.Whether or not this works you need to have the vehicle scanned for codes & problems so it does not fail you.It is possible you have more than 1 problem,but getting the vehicle started is #1.Clean the ignition key off with a cloth before trying this procedure.
Important: The vehicle learns the password XXXXX the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.