Question about 2000 Pontiac Grand Prix

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2002 pontiac gran prix will start for about 5 seconds and security light flashes and car shuts off . I had a different problem last week, it just seemed to start when it wanted to and would be good for days. Then it would not start and when you came back awhile later it would go again and work well all day. Mechanics changed fuel pump,and a module under the distributor. Then today this security light thing and the car cutting out. Any way to reset it or bypass it. Getting tired of putting parts on the car with no guarantees. It showed a p1629 code today on the scanner but i dont think anyone knows what to do next. Could it be the key or a crank sensor??? That's all that seems left to do. Any help for me ???? Thanks Tony

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Usually if there is a security problem on the car , it has to do with the ignition cylinder being that is where the passlock is located . the module has to see a certain resistance when the key is turned to varify that the key is being used rather then someone breaking the cylinder apart when being stolen. Try when the security light is flashing , to leave the key in the on position for 10 minutes to see if the security light stops flashing ,make sure you battery is good , if this works , when the light stops flashing , the vehicle should start. if it does then replace the ignition cylinder and reprogram the module.

Posted on Jul 21, 2009

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