This is a pretty common occurence in GMs. Go to this link, try the 10 minute quick fix. If that doesn't work, you'll be looking at taking it to the dealer, or bypassing the security system. You can bypass it yourself. Go to this link for info and "do it yourself" options. http://vatspasslockpasskeysecurityhelp.yolasite.com/
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This is a pretty common occurence in GMs. Go to this link, try the 10 minute quick fix. If that doesn't work, you'll be looking at taking it to the dealer, or bypassing the security system. You can bypass it yourself. Go to this link for info and "do it yourself" options. http://vatspasslockpasskeysecurityhelp.yolasite.com/