Question about 2005 Chevrolet Monte Carlo

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Sometimes when i unlock car wont start security

Sometimes when i unlock car it wont start The security light flashes even when unlocked! Then suddenly it starts! I had battery and charging system checked and it is ok!

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On your 2005 chev. has a factory alarm system and a chip on the key to the ignition switch if you turn the key and you don't here the starter cranking then that could be the alarm system if you here the starter cranking then it could be the chip in the key when you put the key on and engine off you should see the security light should see the light turn off if not then the anti theft is not deactivating if the light turns off then you have a electrical problem have your starter checked out good luck Josh

Posted on Jul 18, 2009

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This MAY be a problem with the bcm (Body Control Mod) This electronic part controls these things, Cost about $110.00 But the kicker is you have to find someone with a Tech computer that can Flash it with your cars ser # and Code, try to find one in junk yard (cost / plus is it any better than the one you have, is a gamble). Check the web for info on your bcm problem, It is loacted under the dash up top kind of hard to get to.

Posted on Jul 18, 2009

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Related Questions:

1 Answer

Security light flashing and car wont start


Your anti theft system has engaged. You can usually reset it by locking and unlocking the drivers door with the key. Unfortunately I am not a Chrysler expert, so am no help other than that.

May 17, 2016 | 2003 Chrysler Sebring

1 Answer

I have a 1997 infiniti I30, one day all of a sudden when I came out of a grocery store I turned the key and absoloutely nothing happened. My lights can come on inside the car but, my power windows wont...


This is from Ken on CarPros:
Here is the way to reset the security system.

https://www.2carpros.com/articles/how-to-reset-a-security-system

Here is the systems descriptions

There are 2 security system, namely anti-theft and immobilizer.

Here are the 2 systems.

DESCRIPTION & OPERATION
Anti-theft system is controlled by Body Control Module (BCM). BCM receives signals from hood switch, trunk switch, door switches and Local Control Modules (LCMs). There are 5 LCMs located throughout vehicle.

To set anti-theft system in armed mode, remove ignition key, close all doors, trunk and hood. Lock doors using key or remote controller. The SECURITY light will illuminate for 30 seconds, then flash in 2.4 second intervals, indicating system is in armed mode.

To cancel armed mode, unlock and open any door or trunk lid using key or remote controller. SECURITY light will flash every second, indicating system is disarmed.

Alarm will activate (horn sounds, headlights flash and starter circuit is disabled) if any of the following conditions occur while system is in armed mode:

Engine hood or trunk lid is opened using the hood or trunk lid release.
Door(s) is unlocked without key or remote controller.
Tampering with any door/trunk lid key cylinders.
To deactivate anti-theft system, unlock door or trunk using key or remote controller.

If it is the immobilizer that is preventing the engine from being started, ensure you have the correct key and the transponder is intact. Quite often keys are dropped and if it breaks open, the internals would scatter all over. When this occurs, there is a tendency for the transponder to be lost.

Please let us know happens so it will help others.

Best, Ken
I hope that helps you out!

Mar 31, 2017 | 1997 Infiniti.5 J30

1 Answer

Car wont start / security lights flashing


if the security light is flashing try to shut all doors and using the key lock and unlock the drivers door from the outside. This should disable the security system and allow for regular operation. i hope this helps

Aug 19, 2010 | 1989 Buick Riviera

1 Answer

WONT START.SECURITY LIGHT FLASHES WHEN TRYYING TO START


Anti Theft System - inmobilizer is actovated. Need disarm to start engine. Have you another key and fob? Try lock/unlock cycle with new key + fob. Your key may be corrupted.

Try also just unlocking the car with the key (not the fob) as soon as you unlock the door put the key in the ignition immediately and see if the car starts.

If you have your radio code it may be worth trying a total reset (leave the car unlocked) disconnect the battery and leave for 20 mins. then reconnect.

Hope help with this.

May 05, 2010 | 2000 Jaguar S-Type

2 Answers

Car wont start, will not reset, security light always on


try locking and unlocking the drivers door with the key. [sometimes if you reach to un lock door through window it it sets off security]

May 15, 2009 | 2003 Oldsmobile Alero

1 Answer

Security system ,car will not start


do you have keyless unlock remote? sometimes when you do and you unlock your door manually the car will "think" it is being stolen and will shut down. try locking your doors and unlock them with the remote

Feb 17, 2009 | 1998 Pontiac Bonneville

1 Answer

Security lights flashing after battery cable removal-no start


Anytime you disconnect and reconnect your battery, the factory alarm will arm upon reconnection and the truck will not start. You have to close your doors, then manually lock and unlock the door with your key. This should turn off the security system and you should be able to start the truck.

Nov 16, 2008 | 1995 Jeep Grand Cherokee

6 Answers

Jeep alarm will not turn off


The ignition security on/off is located at the trunk lock. unlock and lock rear gate and the alarm will turn off. My jeep sat in my drive for a month before a jeep tech told me this. It still triggers the security sometimes when I unlock the passenger door with the key and I go straight to the rear gate lock and it shuts off instantly.

Jun 27, 2008 | 1994 Jeep Grand Cherokee

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