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After disconnecting battery to do some repairs 2002 tahoe has shut down in anti theft mode how do i override to get started

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Try and do 30 Minute Learn Procedure
Turn ON the ignition, with the engine OFF.
Attempt to start the engine, and then release the key to ON, vehicle will not start.
Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
Turn OFF ignition, and wait 5 seconds.
Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes, the vehicle is now ready to relearn the Passlock? Sensor Data Code and/or Passwords on the next ignition switch transition from OFF to CRANK.
IMPORTANT: The vehicle learn the Passlock? Sensor Data Code and/or Password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
Start the engine. The vehicle has now learned the Passlock? Sensor Data Code and/or password.
With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles.

Posted on May 17, 2017

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