Question about 2002 Chevrolet Monte Carlo

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Changed body control module on 2002 MonteCarlo

Changed the module now all the lights come on but it wont start.Security light turns on in info center.

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Try cleaning the key and ignition switch with alcohol or electric contact cleaner. Try a different key if you have one. And GM's are known to have problems with the ignition cylinder and theft deterant system. A new ignition cylinder costs $280-$300. Sometimes you can turn the key to the run position wait ten minutes and then start it. Some people say you have to turn the cylinder to the off but not lock position before starting after waiting the ten minutes, but my sister didn't have to with her Malibu.

Posted on Feb 07, 2009


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The theft deterrent system has been incorporated into the body control module (BCM). The theft deterrent is provided in order to prevent the vehicle operation if the correct key is not used in order to start the vehicle. The ignition key turns the lock cylinder. The cylinder rotation produces an analog voltage code in the Passlock™ sensor. This voltage code is received by the BCM. The BCM compares the voltage code to the previously learned voltage code. If the codes match, a class 2 message is sent from the BCM to the powertrain control module (PCM)/vehicle control module (VCM). The message enables the fuel injectors.

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Not sure if you mean engine is locking or vehicle will not crank. If the vehicle doesnt crank and the security light is flashing, the problem is most likely a worn out key and lock and tumbler assembly. Once replaced the new key will have to be recognized by the body control module through a reset procedure. Close drivers door. Turn ignition to run position and wait for security light to go out. Turn key off for 2 seconds. Do this 3 times in row. After turning key off 3rd time the key code should be recognized by the body control module and the vehicle should start. Hope this helps.

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Security light always on in a montecarlo ss 2002 whats wrong?

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My 1996 cavalier wont turn on an the anti thef light is on i changed the starter , alternater, an still wont turn on

I hate to tell you this, but all of the components you have just change will not do a thing for the anti-theft light. The vehicles security system has been activated, and that is what is not allowing the vehicle to start. The only way to diagnose what is causing this is to have a scan device capable of Body Control Module communication.

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When i start the jeep all the gages go off and the alarm light comes on. the windows wont go down either. Porblem started when i changed the wrecked drivers door. The lock that was in my original door wont...

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That's a tough one.

I wish you luck in fixing it.

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