Take to a dealership as will need scanning by the manufacturers diagnostic equipment as any thing else could make the situation worse as the vehicle might think some one's trying to steal it , i know its metal and stuff but the computer onboard does try to think!
SOURCE: my 2005 pontiac grand prix
Go through the steps to raise the theft alarm. The local dealer can guide you over the phone - usually after verification you're the rightful owner.
SOURCE: 2004 GRAND PRIX RADIO THEFTLOCK REMOVE
You need to enter the unique code for your radio that was given to the orig owner. If you do not have that you will need to see the GM dealer.
SOURCE: I drilled a hole in the middle of my key on my
It is quite the prosses to dissarm the security system.I have tried before to no avail.I sugest you replace the lock cylender and have the dealer reprogram for the new key.This is your best bet to getting your car back.
SOURCE: 2004 Pontiac grand prix how do i disable theft
Use the drivers side door key to open/unlock the drivers side door before entering your G/P...this turns off the system...Any other non-starting symptoms? Hope this helps.
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