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Posted on Sep 08, 2012
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Resetting the passlock - 2000 GMC Yukon Denali

  • Susan wise
    Susan wise Dec 10, 2014

    This didn't work and the website link is not available

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1 Answer

Joe Taylor

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  • GMC Master 2,229 Answers
  • Posted on Sep 12, 2012
Joe Taylor
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Joined: Apr 08, 2011
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1. First, insert the ignition key and turn the ignition switch to the "On" position (Do not start the engine). Leave the switch on for 11 minutes. The security light may flash or be on steady during this 11 minute period. Make sure the light is no longer on or flashing before proceeding to #2 .
2. Turn the ignition switch off for 30 seconds.
3. Turn the ignition switch to the "On" position (as in step #1) for 11 minutes again.
4. Turn the ignition switch off for another 30 seconds.
5. Turn the ignition switch to the "On" position for 11 minutes a third time.
6. Turn the ignition switch off for 30 seconds one final time.
7. Turn the ignition switch to the "On" position one final time and wait 30 seconds.
8. Attempt to start the engine. If the engine starts and runs normally, the relearn is complete. If the engine does not start, Go to this link for info
http://vatspasslockpasskeysecurityhelp.yolasite.com/

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The most common repair is to replace the ignition lock cylinder due to broken wires inside the steering column. Most common problems related to the Passlock family involve the Passlock sensor. The sensor is part of the ignition lock cylinder on Passlock I and Passlock II systems. ( Where the key goes ), Good-Day!
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it looks like a failure in the theft deterrent system, but Trailvoys contain Passlock security, not PassKey. Passlock consists of a hall-effect sensor and tamper resistor within the ignition cylinder housing, while the PassKey system uses a transponder in the ignition key head.

Passlock isn't affected by contamination of the key, but there are a number of things that can cause it to fail - high or low voltages, problems with the Passlock circuits, module communication failures...
Your best bet is to have the diagnostic trouble codes pulled - there are at least eight associated with Passlock failure
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How do you reset passlock?

Turn the key to run position (engine not running) theft light will flash a few times and stay on. Leave for approximately 10 minutes (may take up to 20 min.) And the theft light will turn off. Repeat these steps 3 times. After the third turn the key off and attempt to start.

I’m happy to assist further over the phone at https://www.6ya.com/expert/samuel_dda9c48bb7ffbfd3

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If I put in a new ignition switch do I have to reset something?

You will probably have to reset the passlock (security) system with the new switch/key. The aftermarket switches come with instructions to reset the passlock code.
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Here is a link that can help you with the bypassing of your Passlock antitheft system. http://vatspasslockpasskeysecurityhelp.yolasite.com/
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My chevy tahoe will not start and the security system light is on on the dashboard

If the light is flashing it may be an issue with the passlock sensor.Here is a process you can try to reset the passlock. If this process does not work you may need to replace the ignition tumbler and passlock.
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1) Put the key in the ignition and turn to the "ON" position. Leave it that way for 10 minutes. After 10 minutes turn the key and take it out. Repeat this process (2) more times (3 times, 30 minutes total) This should reset the PASSKEY system to recognize your key
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un hook the battery cables then try to reset it if that dont work then you will need to take it to a shop to have the passlock code reset
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Try to reset the passlock first. It's free and won't cost you anything to try. My car did the exact same thing and I didn't see the security light on..I'm not even sure it was on but, reseting the passlock fixed the problem. Look at dvj2a's solution.
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