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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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Posted on Jan 02, 2017

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https://www.justanswer.com/chevy/21ffd-2003-chevy-impala-reset-procedure-passlock-scanned-poping.html

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Take it to a mechanic or buy a gizmo you plug into the message control wire by your lower steering wheel and you have to reset the computer. I am not sure the name of the out fit you use but it costs about sixty dollars from an auto store. My mechanic did it for me for forty dollars.

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Instructions
    • 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.
    • 2 Repeat this procedure three times in quick succession without removing the key from the ignition.
    • 3 Start the car following the third 10-minute waiting period. The car should start and stay on. If it stays running, then the codes have been relearned and the problem is solved. If the car still does not start then you may need to have all or part of the passlock system replaced

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Car wont start seems to be a security code that has prevented the car from starting whats youe dignosis its a 2003 chevy impala


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 it comes on when you turn the key on and stays on, there is a short to ground somewhere in the harness.

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How to reset security code on a Chevy impala 2003


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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