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It can be the passlock sensor in the ignition cylinder has failed but initially let me ask, when you turned the ignition on was the amber security/theft light on or flashing? ALso, did you have a fully charged battery and leave the ignition on for 10 to 12 minutes waiting until the security light went out?
Have you had the vehicle scanned for fault codes to confirm it is a theft deterrent fault? Also, after the 10 to 12 minute wait with the ignition on, does the security light go off?
No I have not had it scanned. I had to have it towed home because it happened when I was out shopping. The security light never went out. I forgot that we also unhooked the battery and tried the 10-12 minute ignition on.