Question about 1998 GMC Envoy

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I am having a problem that just started, My security light stays on and is flashing if I leave my key in the on position after about 10 minutes it will start but then when I shut it off it won't start again until I leave the key in the on position for at least 10 minutes Could you let me know what this could be Please

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Hello: The best to do is have the system checked with a scanner to get the code but most likely you have a pass-lock system problem. The whole lock cylinder will have to be replaced along with a new key.

Posted on Jul 22, 2011

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Posted on Jan 02, 2017

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My neighbor changed the steering wheel on a 2001 suburban and now security light is on. Now the truck starts then dies. I need a passlock diagram


Sounds like you need to do a 30 minute security relearn. Basically turn the key to the run position, do not start. Leave it in the run position for approximately 10 minutes. The flashing security light will go out. Turn the key off for 5 seconds. Turn it back to the run position for another 10 minutes. Again the light will stop flashing. Tune the key off and repeat one more time. When the light stops flashing turn the key of and then start the vehicle.

There are also plenty of references to this online as well. Good luck.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

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Instructions
    • 1 Attempt to start the car. If it does not start, or dies very quickly after it started, then leave the key in the ignition in the "ON" position and wait 10 minutes. Make sure the security light is flashing. After 10 minutes the security light will stop flashing and either turn off or stay on steadily. When it does, then turn the ignition off, wait 20 seconds and attempt to restart the car.
    • 2 Repeat this procedure three times in quick succession without removing the key from the ignition.
    • 3 Start the car following the third 10-minute waiting period. The car should start and stay on. If it stays running, then the codes have been relearned and the problem is solved. If the car still does not start then you may need to have all or part of the passlock system replaced

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Turn the key to acc and wait about 10 minuter for the security light to go solid or stop blinking

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u will need about 1/2 to do the flash ----insert key and turn to the on position [do not start] and leave in this position for ten minutes --the security light will flash and go on and off during this ignition flash ---then turn off for 10 seconds ====repeat this step 2 more times than turn key to on for a second than start vehicle ur key and ignition relearn should be complete

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If the security light is hot or flashing when the key is in the on position, most likely the ignition key tumbler housing has failed.

You can try resetting the pass code by turning the ignition switch to the on position (do not crank or start the engine). Leave the key in the on position for 10 minutes. Turn the key to the off position, wait 5 seconds and turn the key to the on position again and leave it on for 10 more minutes. Cycle the key to the off position again for 5 seconds the back on for a final 10 minutes. Once the final 10 minutes is complete, turn to the off position again, wait 5 seconds and now turn the ignition on and to the start position. The pass code has now been reset and it should start. If the reset does not work you will have to change the ignition key tumbler housing that contains the key code resistor.
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There is a resistor either in your key, or your ignition switch on the steering column. A resistance value is sent to your BCM (body control module) - which is programmed to accept a certain value. If this resistance changes; because of corroded wires, a degraded or changed resistor, or changing your key lock cylinder - you've got to do the relearn procedure.
Step 1 - Attempt to start the vehicle. It will crank, but not run. The security light will be flashing on and off. Leave the key in the 'run' position for exactly 10 minutes, then the security light will stay solid or go off.
Step 2 - Turn the key to the 'off' position for 10 seconds. Attempt to start the vehicle. Some vehicles will run at this point, although many will require you repeat repeat Step 1 two more times. Make sure turn the key to the 'off' position for 10 seconds before each 10 minute cycle.
Step 3 - The vehicle is now ready to relearn the proper code. Turn the key 'off' for 10 seconds and then 'crank' the vehicle. It should be running now. The security light might stay on solid for several minutes afterwards, depending on your system.
Depending on the problem you are having this may help.

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this process will take about half an hour to doyou might want to put a battery charger on it on the low setting because if the battery dies in process u have to start over.first thing is try to start car,it might start then stall,when that happens leave the key in the on position and the security light will be flashing and it will keep doin it for 10 minutes,then it will stay on solid,when it does that turn the key off for 2 seconds then turn it to the on position anfd the light will be flashing agian for 10 minutes,then it will be on solid,then turn the key off for 2 seconds and then back on and 10 minutes later when it stops flashing this time u should be able to start it and the light should be off,hope this helps

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u will need to have the dealer test the security system for a trouble code, this can be the key, the key signal sensor or the body control module (BCM) the test will pin point the cause.

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when key on and engine off, does the security light flash constantly? if so its shutting down the fuel pump, it starts momentarily due to the computer priming the engine with fuel. how to reset, turn key to run position, leave it on touch nothing, takes 10-12 minutes, start watching light around 10 minutes. it will stop flashing... turn key off, then back on and start this will reset the security system. they are sensitive on this platform car it will happen again. good luck!

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