Question about 2005 Chevrolet Blazer

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Anti theft light came on,stayed on for a few days.The light fanally shut off,now the truck starts for a couple seconds then stalls out.How can i fix this problem??

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Posted on Jan 02, 2017

tayjoejoe
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SOURCE: anti theft light came on,stayed on for a few days then shut off,now the truck starts then stalls out after two seconds.Whats the problem??

Sorry to hear about this problem. Unfortunately this is a classic GM antitheft system failure. Believe it or not, this is very common and can be very expensive to take to a mechanic. Do yourself a favor, go to this link and study up in this system. There is alot of information here and you should be able to learn what's going on. There are also some ways to fix this problem yourself at a much cheaper cost.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Posted on Feb 21, 2012

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Anti-theft system has nothing to do with it . Battery cables , maybe , Park neutral safety switch possibly ! With anti-theft system problem you wouldn't a click or anything , that is if the anti-theft disables fuel or the starter . Plus the SECURITY light would be on if it were a anti-theft system problem . Your best bet , take it to a qualified repair shop that knows how to do starter circuit testing >
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How to voltage drop test starter motor circuit

And what's this identity anti theft system ? No such thing ! The vehicle has a content theft an vehicle theft deterrent system !
This system disables fuel not cranking of the engine. The VCM/PCM will not disable the fuel due to any BCM message for the remainder of the ignition cycle.
If the VCM/PCM does not receive the same password from the BCM as the last learned one, the vehicle will start and then stalls due to the Fuel Lockout.

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Anti theft light came on,stayed on for a few days then shut off,now the truck starts then stalls out after two seconds.Whats the problem??


Sorry to hear about this problem. Unfortunately this is a classic GM antitheft system failure. Believe it or not, this is very common and can be very expensive to take to a mechanic. Do yourself a favor, go to this link and study up in this system. There is alot of information here and you should be able to learn what's going on. There are also some ways to fix this problem yourself at a much cheaper cost.

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Could possibly be the anti theft system. Check out this link. When the SECURITY fails, you should see a light on the dash that says security. A symptom of a failed anti theft is starting for 1-5 seconds and then stalling repeatedly. http://vatspasslockpasskeysecurityhelp.yolasite.com/

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I have a 2000 Pontiac Grand Am 3400.. wouldn't start one day at all so replaced batt, starter & alternator. Once driven all lights come on and then power loss happens and car shuts down. Jumping...


This could be an anti theft security issue. This happens all the time in GM's. The anti thefts are known to fail and cause the car to not start, stall while driving, or start for 1-5 seconds and then die. A good indication that the security is failing is if you see a light on the dash that says SECURITY or a picture of a car with a padlock thru the window. This link explains the problem, symptoms, and some DO IT YOURSELF solutions. http://vatspasslockpasskeysecurityhelp.yolasite.com/

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your ignition switch could have carbon on the main contacts you should disassemble it clean it then reinstall it. the after market switches for that car are not very good. the switch is the problem causing the light to stay on. paslock is the reason your car will not run. the easiest why to fix it is- go on the net find a remote start companys one of them will have a genric diagram explaining what they have to do to get around paslock. with this diagram you can see the wire to cut and then insert the proper resister to resignal the paslock then remoce the resister reconnect the wire.

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I disconnected the + wire from the battery terminal and left it for a couple of days to reset the computer, That's not going to do anything . You never ever disconnect the positive cable untill the negative cable is disconnected first . An disconnecting for 1/2 hour would be enough .
my mechanic told me it was a glitch in the computer, If the check engine light is on there is a DTC - diagnostic trouble code . You need to find yourself a new mechanic .
If nothing happens when you turn the key to the start position U need to find out if anti-theft system can disable the starter circuit .If not check battery condition ,connections an cables doing a starter circuit voltage drop test . Also your vehicle has integrated power module , google that one . There is a starter motor relay in the under hood fuse box , do you know what a relay is ? If you find it , pull it out an look on the bottom , you will see four sets of numbers . 30 &87 .these are the load side (starter ) if you jumped those together with a paper clip or piece of wire . if the starter is good an the cables an connections are good the starter will spin the engine over . Pins 85 & 86 are the control of the relay circuit . 86 should have B+ voltage when trying to start the vehicle , 85 is from the PCM - engine computer . The PCM will ground this circuit internally , if it see's that the transmission is in park or neutral an if thier is no anti-theft system problems .

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hope this helps.

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