Question about 2002 Chevrolet Monte Carlo

2 Answers

Car will start sometimes but has security light on. it was really hot this summer and it would not start in the heat of the day but it would start in the morning. i have read some reviews and it leads

I have read that when the engine gets hot the car wont start back up if the ignition control module is faulty. you can sometimes pour water on the igm to cool it down and then it will start. not sure if it works i have not tried it. will the car turn over if the igm is bad? will the car turn over if the body control module is bad? the car wont do any thing it just flashes the security light ....no radio air or anything. please help me with this headache

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  • 1 more comment 
  • Lonnie Burleson
    Lonnie Burleson Feb 16, 2012

    nobody knows?
    \

  • Jeremy W.
    Jeremy W. Feb 16, 2012

    do the headlights, tailights, brake lights, and interior lights work?

  • Lonnie Burleson
    Lonnie Burleson Feb 17, 2012

    yes all the lights work but they flash. its almost like they are pulsing

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2 Answers

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  • Chevrolet Master
  • 75,077 Answers

The on reason that comes to mind is that the key reader in the ignition switch is defective, they do act yup m,ore in hot temps.u

Posted on Feb 16, 2012

  • 4 more comments 
  • Lonnie Burleson
    Lonnie Burleson Feb 17, 2012

    i will try replaceing that. do you have to have it reset by the dealer after you replace it. doesnt it have to maintain the set resistance?

  • yadayada
    yadayada Feb 17, 2012

    Yes this is a dealer level job, the lock cylinder may have to be replaced.

  • yadayada
    yadayada Feb 17, 2012

    Yes this is a dealer level job, the lock cylinder may have to be replaced.

  • Lonnie Burleson
    Lonnie Burleson Feb 17, 2012

    i can replace the lock cylinder but will the dealership mess with it after that? is the card reader in the cylinder or is it in the part the cylinder goes in? i think the other part is a ignition start up . is it possible to check the resistance of the cylinder currently in the car and then replace it and set the new cylinder to the same resistance? i dont know how the dealership does this but i think that must be how.

  • Lonnie Burleson
    Lonnie Burleson Feb 17, 2012

    i can replace the lock cylinder but will the dealership mess with it after that? is the card reader in the cylinder or is it in the part the cylinder goes in? i think the other part is a ignition start up . is it possible to check the resistance of the cylinder currently in the car and then replace it and set the new cylinder to the same resistance? i dont know how the dealership does this but i think that must be how.

  • Lonnie Burleson
    Lonnie Burleson Feb 17, 2012

    i can replace the lock cylinder but will the dealership mess with it after that? is the card reader in the cylinder or is it in the part the cylinder goes in? i think the other part is a ignition start up . is it possible to check the resistance of the cylinder currently in the car and then replace it and set the new cylinder to the same resistance? i dont know how the dealership does this but i think that must be how.

×

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  • Chevrolet Master
  • 5,332 Answers

I have a feeling this is not a lock cylinder issue. All the lock cylinder does is turn the ignition switch. The items you have described as not working are all powered by switched ignition. The ignition switch would be higher on my list of things to check than anything else. The other thing is that if the factory security system was armed the car would still crank over, the dash light, radio, and HVAC would still work. The factory security system does not disable any of these. The ignition switch would disable these. The ignition switch itself needs to be checked for power in and power out. This needs to be done with a voltmeter.

Posted on Feb 17, 2012

  • 4 more comments 
  • Lonnie Burleson
    Lonnie Burleson Feb 18, 2012

    if i replace the ignition switch do i have to then have it reprogrammed by a dealer?

  • Jeremy W.
    Jeremy W. Feb 18, 2012

    The ignition switch, no. I would not recommend replacing it on a whim. It is very easy to check and see if it is working. You can easily spen a lot of money trying to figure this out by replacing parts without checking them!

    The ignition lock cylinder, yes it will need to be reprogrammed but I am pretty sure you can do it yourself. I would have to look it up but I have replaced many of these and have never had to send the vehicle to the dealer to relearn the new padlock on the older vehcles.

  • Lonnie Burleson
    Lonnie Burleson Feb 18, 2012

    how do iI look it up to work on it. what book do you recommened?

  • Lonnie Burleson
    Lonnie Burleson Feb 18, 2012

    how do iI look it up to work on it. what book do you recommened?

  • Lonnie Burleson
    Lonnie Burleson Feb 18, 2012

    how do iI look it up to work on it. what book do you recommened?

  • Jeremy W.
    Jeremy W. Feb 18, 2012

    do you have a voltmeter?

    If you do I can walk you through the steps. It wouldn't hurt to have a little knowledge of automotive electricity and how it works. If you have neither than this is not a DIY job for yourself.

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