Question about 2003 Chevrolet Monte Carlo

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03 monte carlo, headlights are flashing on and off by them selves, security light and low voltage light are on and volt meter says battery is dead but is still holding a charge, any idea's or need more info let me know.

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  • rob507 Sep 06, 2009

    Nope batt. is holding 14.2 volts while meter in car says its dead "battery is only 8 months old and passed a load test as did the new alternator", now radio says locked, so security settings are doing this im told by a lot of people but no one can tell me how to disable anti-theft features on the car, does anyone here know how to disable the anti-theft.

  • rob507 Sep 13, 2009

    ok i did an obd2 scan on it and got these code

    1)B3247-Door/liftgate lockmotor circuit low "im told this is the one causing security light to come on"

    2)0440-evap. emissions control system

    3)1811-transmission maximum adapt and long shift "i fixed this 40k miles ago and have not seen this code when auto zone or other parts stores have checked it, just dont know how to clear from history"

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  • 53 Answers

You still need a new battery

Posted on Sep 05, 2009

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2 Answers

On my 03 monte carlo my security comes on then a red battery light and sometimes a bell sounds.battery in morning very rarely cannot start car . battery and altinator check out good


I would get one of those cheap meters that plug into the cigarette lighter they cost about 5 dollars and it will monitor you system voltage. You might have an intermittent problem. Make sure your battery terminals are clean that means taking them off and cleaning them with a tool that brushes both sides with wire. I still think you have a bad battery or alternator. Your starter could be drawing to many amps also

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Battery wont charge, battery/ABS/SRS/BRAKE lights come on while driving and flicker. voltage increases to dash lights/fan speed/headlights periodically.


Get a volt meter, start your car and see how many volts your car is producing while running. Should be around 14 volts. May want to watch the meter for a while since your electric seems to fluctuate. Most voltage regulators are internal of your alternator. If you are getting a lot more or less than 14 volts while running, replace the alternator. If it is not charging, voltage will drop as vehicle runs, until battery is dead.

Dec 12, 2013 | Cars & Trucks

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Where is the voltage regulator located on the 03 monte carlo have a problem with the security system the gauge for the alt dont not show any voltage the battary light flashes with security light and it...


The security system considers low voltage a threat to the security of the vehicle. MAYBE, just maybe the gauge not reading the voltage correctly is causing the security system to shut you down. 2 options: Fix the gauge and hope that allows the secuiry to work properly OR bypass the security system so it CANT shut you down... The security light is an infamous problem on GM vehicles. They tend to NOT be tied into anything other than the ignition, TDM computer (theft deterrent module), starters or injectors. But anything is possible on new cars. I'll tell you what, bypassing that security system is a gauranteed way to get that car running again. Only takes about an hour as i have done alot of these personallly. This site has tons of info and ive done both different bypasses decribed on this site and they both work. Pending on your vehicle's system.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

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1 Answer

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Sounds like dead battery check battery voltage with a multimeter it should read between 12-12.6 volts anything less than 12 volts you'll need a new battery.

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THE ALTERNATOR MOST LIKELY THE PROBLEM, IF THE BATT IS GOOD, THEN IT WILL CHARGE BACK UP WHEN THE CHARGING PROBLEM IS FIXED...HOPE THIS IS SOMEWAY HELPFUL

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Day time running lights run low voltage to the high beam bulbs so it sounds to me like you need two new bulbs or you need to check the fuses and see if any need replaceing.

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01 monte carlo securty & battey light problm


I had the same problem. Also, "service traction system" warning light, "service engine soon", and "trac off" warnings. Audio system locks every time the voltmeter goes flat. I expected an expensive repair bill. On a hunch, I pulled both battery terminals, scrubbed all points of contact vigorously with a wire "toothbrush" and baking soda paste. (They didn't look like they needed it at all) Reconnected, tightened securely, started engine , and everything is back to normal. Zero cost, 10 minutes of your time.

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