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Bart, GM Master tech
Category: Chevy
Satisfied Customers: 136
Experience:  20 Years Gm Auto Tech All current gm training GM Master tech ASE Master tech All electrical problems
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2000 chevrolet: system..the security light will blink

Customer Question

I have a 2000 chevorlet silverado Z71. I am having problems with the security system. Every once in a while it will not start and the security light will blink. I can wait about 10 min. and it will reset and start. I took it to the dealer and they could not find anything wronge because it was working ok at the time. They told me the system could not be bypass. I know this is bull. I would like to know how to bypass the system. Can anyone help????
Submitted: 10 years ago.
Category: Chevy
Expert:  Bart replied 10 years ago.
You can not bypass security system it is built into the body control module Your problem is the pass key sensor in the ignition cyclinder Don,t know why they did not get it right This problem would deffinly leave a code B2960 in the body control module By leaving the key on for 10 minutes till the light stop blinking y Document ID# XXXXX
2000 Chevrolet Chevy C Silverado - 2WD

PASSLOCK Reprogramming Auto Learn

Programming Replacement PasslockTM Sensor, BCM, or PCM


  • The body control module (BCM) must be programmed with the proper RPO configurations before performing learn procedures. See Body Control Module (BCM) Programming/RPO Configuration .
  • If replacing the BCM with a GM Service Parts Operations (SPO) replacement part, the module will learn passlockTM sensor data code immediately. The existing PCM however, must learn the new fuel continue password XXXXX the BCM is replaced.
  • If replacing a PCM with a GM Service Parts Operations (SPO) replacement part, after programming, these modules will learn the incoming fuel continue password XXXXX upon receipt of a password XXXXX Once a password XXXXX is received, and a password XXXXX XXXXX a learn procedure must be performed to change this password XXXXX A PCM which has been previously installed in another vehicle will have learned the other vehicle's fuel continue password XXXXX will require a learn procedure after programming to learn the current vehicle's password.



Use this procedure after replacing:

  • PasslockTM Sensor
  • BCM
  • PCM
30 Minute Re-Learn Procedure
  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to start the engine, then release the key to ON (vehicle will not start).
  3. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
  4. Turn OFF the ignition, and wait 5 seconds.
  5. Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes ( the vehicle is now ready to relearn the PasslockTM Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK).


    The vehicle learns the PasslockTM Sensor Data Code and/or password XXXXX the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.


  6. Start the engine (the vehicle has now learned the PasslockTM Sensor Data Code and/or password).
  7. With a scan tool, clear any DTCs if needed (history DTCs will self clear after 100 ignition cycles).

Document ID# XXXXX
2000 Chevrolet Chevy C Silverado - 2WD
ou are relearning key code