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Old 07-22-2013, 03:16 PM   #1
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Unhappy 1999 GMC Sierra 1500 4x4

Is there a way to bypass the security system in this specific make and model and year of truck? When I brought the truck home after purchasing it there were some minor repairs. The truck was in running condition. Here is what I have done so far uptodate. I replace the front hub, replaced spark plugs, put in a new fuel filter and also replaced with a brand new battery from one that was weak.
Upon doing all of these repairs my truck will not start. The security system is now turned on and I would like to turn it off or bypass it somehow. When I pour gas directly into the carb, the truck will start but it will idle very rough and then die. I am pretty sure it does have something to do with the security system. Any help would greatly be appreciated.
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Old 07-22-2013, 04:27 PM   #2
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Old 07-22-2013, 04:40 PM   #3
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the security light on?

the only reliable way is to disable it is to send it to blackbear or similar and have the security disabled in the pcm
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Old 07-22-2013, 04:45 PM   #4
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My only problem with this is my ignition key does not have a chip on it whatsoever.
What is the pcm or where is that located so that it can be disabled.
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Old 07-22-2013, 04:48 PM   #5
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everyone keeps referring to a car my problem is with a 199 GMC Sierra 1500 4x4 truck.
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Old 07-22-2013, 04:54 PM   #6
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yes the security light is on and it stays on it does not flash or anything. even my door locks do not work or my remote alarm.
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Old 07-23-2013, 07:03 AM   #7
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now it sounds like you have a aftermarket alarm screwing things up. a 99 new body style should start and shut off a couple seconds later if vehicles security is bad and the light blinks. thats it. the other stuff means something else is wrong. possibly bad ign, or aftermarket alarm
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