Question about 1998 GMC Sierra

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I have a 98 gmc starts but stops right light is on

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This is a comon problem as the vehicle does not see the correct key in the ignition. two problems are comon one is if it has a tilt steering column the wire for the lock cylinder in key breaks and need to be replaced and the other is the key does not fit the lock cylinder any more so it say theft system is not correct then shuts down injector system.

Posted on Jan 24, 2013

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Disconnect battery for 25sec.

Posted on Jan 24, 2013


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Posted on Jan 02, 2017

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SOURCE: 98 gmc 1500 starts but shuts off,just like if I remove security f

Check your map sensor.(on top left of intake- vacume line connects to back of throttle body) it will crank without it, but will shutoff soon after. Good luck

Posted on May 07, 2009

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SOURCE: how do i bypass security on 98 gmc jimmy 4.3

I experienced this problem, intermittant failure to start. This procedure must be done with the truck RUNNING.

Remove the cover off of your ignition switch. On the top there is a small wire connector that, once the truck is running, should be disconnected. This will turn on the 'SECURITY' light. All will be better, except the security light will be on at all times, much cheaper than replacing the ignition switch, however.

Posted on May 10, 2009

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SOURCE: My security light is on and my 98 gmc jimmy will

Hi: If you replaced any of these parts what you are describing will occur... 1 - computer, 2 - body control module, 3 - ignition switch in column. In order for the vehicle to run all 3 items have to be from the same vehicle. The only other condition is that the vehicle has gone into theft mode if original parts are being used. To release from theft mode put key in on position... leave on for 1/2 hour, take key out for 5 minutes then start... problem solved. Hope this helps... please rate suggestion... ty

Posted on May 21, 2009

  • 355 Answers

SOURCE: Passlock Security information for GMC Sierra 1500"

you can bypass the system. There is a great write-up here: .

Posted on Jun 14, 2010

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SOURCE: i changed a steering column

if there was a chip in the key you will have to get the new colum programed to match the orginal computer

Posted on Dec 31, 2010

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Seems like you know the problem, this link should provide a solution.

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98 gmc 1500 starts but shuts off,just like if I remove security f

Check your map sensor.(on top left of intake- vacume line connects to back of throttle body) it will crank without it, but will shutoff soon after. Good luck

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