Question about 1999 Chevrolet 3500

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Starting is a problem

The security light comes on and will not let the truck start. It will fire up and then die .

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YOUR IGNITION CYLINDER NEEDS TO BE REPLACED your passlock system needs to see the magnets in there turn at same time and as they get worn it thinks truck is being stolen

Posted on Oct 08, 2008

  • TripleTauto
    TripleTauto Oct 08, 2008

    1. Insure the ignition key is in the "ON" position.
    2. Record an VCM/PCM DTCs and to refer to Powertrain On-Board Diagnostic (OBD) System Check. Clear all EVO/PASSLOCK module and VCM/PCM DTCs.
    3. Momentarily rotate the ignition key to the "CRANK" position (DO NOT start the vehicle), then release it to the "RUN" position (DO NOT turn key "OFF" in the process).
    4. Wait 10 minutes. Observe the "SECURITY" indicator. Refer to the following list for the appropriate responses:

      1. If the PASSLOCK sensor was replaced the "SECURITY" indicator will flash for the 10 minutes duration.
      2. If the EVO/PASSLOCK module was replaced, the ""SECURITY"" indicator will flash for a few seconds and then remain "ON" for the remainder of the 10 minutes duration.
      3. If the VCM/PCM was replaced with a new programmed VCM/PCM and connected to the vehicle for the first time, the vehicle will start and this procedure may not be necessary.
      4. If the replacement VCM/PCM was connected to any vehicle at any other time, even momentarily, the "SECURITY" indicator will flash for a few seconds and then remain "ON" for the 10 minutes duration.

    1. The "SECURITY" indicator will transition from flashing to "ON" briefly to "OFF" after 10 minutes of remaining in the ignition "ON" position.
    2. Turn the ignition switch to the "OFF" position and wait for 10 seconds.
    3. Repeat steps 3 - 6 two more times. The new security code is ready to be communicated among the PASSLOCK sensor, EVO/PASSLOCK module and VCM/PCM. The new password is learned on the next ignition lock cylinder cycle from "OFF" to "CRANK" to "ON" (start attempt).

    replace passlock sensor and do this



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