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2004 Chevrolet Monte Carlo Security Light and Won’t Start

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11 Responses

  1. oliver cromwell x says:

    My car does start and run. How do I reset the passlock security light. And if I shut of the alarm (PASS LOCK). will this do any harm to my car

  2. yvonne says:

    i have a 2004 chevy m carlo ss,, today it would not turn over and the security light came on and the alarm went off, I had to disconnect the horn.. It came on after 15 minutes on its own. that happen twice this week, do I need to replace the key cylinder. I reset the settings to original…I don’t use the remote control key, just one regular key. It as happened for a few years now when I took it to the dealer to bypass the passcode..

  3. dale says:

    I have an 04 Monte Carlo is, I tried to start it and it won’t crank, and the security light and check engine light is on

  4. Bajram says:

    Yes, the ignition modlue when first failing will cause the engine to die when it warms and start back up after it has a chance to cool (not necessarily cold.If the chack engine light is on, it would be a good idea to have the codes scanned to see if there is a misfire present. If there is a misfire and a loss of coolant, you may have a . You can scan the codes your self at home. Here is how to do it along with code desciptions:

  5. Aisha says:

    I have a 2004 Ss Chevy Monte Carlo dat want start the security light is flashing I turned the key forward for about 15mins and its still doing tha same thing can u tell what I can do about this

  6. Pam says:

    I had to pull the dash to change the heater coil in the 03 monte carlo, now it will turn over and not start. Do you suspect that I have engaged the security system to lock? will unpluging and removing dash parts result in security system lock down on my MC? and i have tried all the “kitchen sink” techniques for re setting the system, none of them work.

    • Tom says:

      You can try the 30 minute relearn procedure. If that does not work, then i would think you left something unplugged.

  7. Alan says:

    I have the same problem with my 2003 2 lock cylinders later in 3 years..it is still there.

    Security light is on and it a crap shot sometimes whether it will start,,,,,

  8. mike says:

    2001 Chevy Monte Calro will not turn security light on reseting still no go when car siting headlights blink and drains battery is there away to disconet alarm.