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Next time the car wont start, note any lights on the dash. If you find one that says SECURITY, ANTITHEFT, or looks like a car with a padlock in it, go to this link to find some help.
Possible antitheft problem. When the antitheft fails, you get a light on the dash that says SECURITY, and the starter gets turned off. This link explains.
Alternator isnt the problem, just for charge. First test charge battery, will need 12v to start.
Additionally, I suggest check starter and starter solenoid (if you have one there), ignition switch and aftermarl or antitheft system.
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One reason GM vehicles dont start, especially when the weather changes isdue tofaulty antitheft systems. Next time this happens, look for a light on the dash that says secury or antitheft. Picture might look like a car with a padlock thru the window, If you see any of these lights, that will explain why it doesnt start. This link explains.
http://vatspasslockpasskeysecurityhelp.yolasite.com/
Look for any indicator lights on the dash when this happens. Look mainly for a light that says SECURITY, ANTITHEFT, or looks like a car with a padlock thru it. If you see this light, go to this link.
http://vatspasslockpasskeysecurityhelp.yolasite.com/
These cars had big problems with failing antitheft systems. Next time it doesnt start, leave the key forward and look for a light on the dash that says ANTITHEFT, SECURITY, or has a picture of a car with a padlock thru it. If you see any of these lights, go to this link to get some info on the problem
You either have an ignition that has failed, or a failing antitheft system. If you see a light that says "security" our looks like a car with a padlock in it, go to this link.
http://vatspasslockpasskeysecurityhelp.yolasite.com/
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