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How do you reset the security code on a 2003 chevy montecarlo

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It is not something that you can do at home or that the dealer can fix without replacing the ECU

Posted on Sep 11, 2010

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    • 1 Attempt to start the car. If it does not start, or dies very quickly after it started, then leave the key in the ignition in the "ON" position and wait 10 minutes. Make sure the security light is flashing. After 10 minutes the security light will stop flashing and either turn off or stay on steadily. When it does, then turn the ignition off, wait 20 seconds and attempt to restart the car.
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Call a Chevy dealership, ask for service department. Tell them about it and ask what you have to do to get the code. Also if it is n9ot a code then they may be able to help you out by giving you some suggestions, other than bringing it in to them.

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If the security light has come on, that is indicating a problem in the antitheft system. Tho it may be intermittent right now, it can only get worse. Read thru this link, it will help you understand the problem, offer some tips and tricks, and show you some ways to bypass and fix it.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

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