Question about 2008 Chevrolet Cobalt

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Changed battery, and the car started but it won't start now

Everything works but the car won't start and the anti theft symbol comes up.

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Put the key in the ignition and turn to run position (do not crank over engine) and let it set for about 10 minutes, repeat up to 3 times, if this still doesn't let you start you will need the dealer to reprogram the systems control module.

Posted on Apr 16, 2014

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Posted on Jan 02, 2017

SOURCE: 1996 Camaro RS suddenly wont start - anti theft problem?

You can start it by putting into program mode...try to start, then turn it to off..,,then turn it to on (not start)..leave it on for 15 min...turn it to off for 2 min..and start..

This will reset the signal from the bcm to the pcm of the car.

you most like ly have a problem in the start switch key reader...It has to be replaced as a unit

Or it could be your bcm or pcm...very very expensive... try this first... If it does not work off to the dealership..don't even try to give this to a garage to fix. Gm has the software to reflash your computer.

Posted on Oct 26, 2008

sheakcoleman
  • 2 Answers

SOURCE: car wont start anti theft device activated on chev. equinox 2006

alarm remote needs new batterys

Posted on May 27, 2009

  • 88 Answers

SOURCE: anti theft light

check the code .most likely ignition switch.first of all reset the light by 1switching the key on engine off till the anti theft light go off then 2switch it back to off possision for three second then on again repeat the 1 and 2 procedure 3 times then try to start.

Posted on Mar 27, 2010

  • 5 Answers

SOURCE: When anti theft light is blinking the car wont

On a 2003 Chevy Maibu the theft system light comes on and blinks when the system is triggered. The car will not start and the fuel pump cuts out. You must turn key to on and have all doors closed. Keep the key to on for 10 mins til theft light turns solid and then disappears. Then turn key to start and it should fire up.

Posted on Aug 07, 2010

  • 3640 Answers

SOURCE: anti theft light

to reset theft system--turn key to on, leave for about 15 minutes. after 15 min. turn key off, wait 15 seconds. then try to start car. to bypass anti theft system-- all gms===go to site- newrockies.ca/vatsbypass.

Posted on Sep 11, 2010

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