Question about 1999 GMC Jimmy

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My 1999 jimmy is in theft mode. how do I bypass that?

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Read thru this link, you should find everything you need.

Posted on Feb 18, 2012


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2 Answers

Truck will not start anti theft will not shut off

The security light illuminates when that signal gets broken, or not seen at all. When the communication breaks, the car misinterprets this as an attempt at theft and goes into antitheft mode. (like it thinks it's being hot wired) The car shuts down because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle. It will either turn off the starter, or the fuel injectors. The vehicle may run for 2-3 seconds before shutting down. This link explains it pretty well.

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The ignition and key are good but the car is in theft mode

your anti theft device is activated,you need to lock and unlock your doors a couple times with the key fob,not the key,and then you need to put the key in the ignition and start it,if you dont have your key fob,call your car dealer to get a new one,they are programmed for each car only,you cannot bypass it.

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Where is shift actuator located on 1999 Jimmy 1999

I had the same problem with my 1999 Silverado which would blink several times on the mode I selected then go back to the 2 wheel High. I found the switch module to be defective, after replacing it I have never had the problem again.

Nov 22, 2010 | 1999 GMC Jimmy

2 Answers

I took the cat off on my 1999 Jimmy. Now a code

thats easy,,,put the cat back on,,,the car wont run right with out the cat fitted,, your lucky the car.s computer never put you in "get you home mode!" in that it would have ran like a dog and if you were lucky you may have got as much as 15 mpg @35 mph tops!!!!

Mar 08, 2010 | 1999 GMC Jimmy

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