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Antitheft light flashing and engine will turn over but will not stsrt .

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  • Cars & Trucks Master
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Try another key

Posted on May 17, 2017

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Posted on Jan 02, 2017

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2002 Oldsmobile alero passlock problems.


If the antitheft light is on and the car won't start,turn the key to on position and wait for the antitheft light to flash or go out (can take up to 20 mins)then try and start the vehicle.This is the key relearn procedure when the ignition switch does not read/see the key chip correctly.

May 03, 2017 | 2002 Oldsmobile Alero

2 Answers

Will not start


This may be related to the antitheft system The system is known for turning off the starter and/or injectors when it fails. Is there a light on the dash that says SECURITY? This is a common problem worth looking into. http://www.diy-gm-security.com/

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Jan 15, 2014 | 1997 Saturn SL

1 Answer

2003 ford expedition will not crank below 50 degrees. Security light on the dash will flash real fast. motor will turn over just will not crank. later in the day when it warms up it will start right up and...


It can be as simply as a bad battery. The Antitheft system views a low battery as an attempted theft action. Then the Antitheft cuts cranking voltage to around 7 Volts to prevent the engine from starting.

Battery voltage drops in cold weather. This would explain your problem and the activation of the Antitheft light.

Please rate my info. You might try adding a battery charger for a few minutes before you try starting it and see what effects it has.

Another idea is to turn off the A/C when cranking. The A/C clutch is a big drag on the system AND is temperature controlled to disengage the clutch at lower outside temperatures. If this control is not working, the A/C would not disengage.

You can get the starter tested on the vehicle with a DRAW test. The battery can be tested too. FREE at most big parts stores like Autozone.

Mar 03, 2013 | 2003 Ford Expedition

1 Answer

Flashing security light, engine won't start


The security, antitheft, or passlock light is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car misinterperates this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle.
This link may help you find ways to bypass this or fix it yourself.
http://vatspasslockpasskeysecurityhelp.yolasite.com/

Mar 01, 2013 | Cars & Trucks

1 Answer

Disconnected battery, dash lights flashing, engine will not turn over


does it have antitheft ?if so u will need to pull fuse for this with battery disconnected then reinstall fuse

Sep 03, 2012 | 2002 Jeep Grand Cherokee

1 Answer

Chevy Malibu LS (V6-3.1 L) won't start or starts up and IMMEDIATELY dies, how can I diagnose the problem?


Your car starts and dies due to the failing antitheft system. Your vehicle is not receiving the "fuel enable" signal that it needs to keep running. So the injectors get turned to off to prevent theft. You will need to diagnose which part of the antitheft system is failing. Or bypass the entire security system. This link will help you understand the problem, and depending on the year of your vehicle, possibly a good bypass solution.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

May 18, 2012 | Cars & Trucks

1 Answer

How to check if the antitheft is bad, the engine turns has power, pressure to the fuel rail is good. Injectors good but no power going to them when cranking. Noticed the theft light stays on when turning...


in the center of the dash you have a flashing red light when car is not on looks like alarm system. if that light is flashing or stayting red while cranking you have a antitheft problem

May 10, 2011 | 1999 Ford F150 Regular Cab

1 Answer

My 98 cavalier starts for one second then shuts off flashs the antitheft light


to reset anti theft system--turn key on engine off, for about 10 minutes. after 10 minutes, turn key off, wait 15 seconds, then try to start car. from 97-2005 gms have a theft system called a passlock system. you can go to tubesound.com/passlocksystem. to disable system for good.

Sep 17, 2010 | 1998 Chevrolet Cavalier

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