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2004 chevy surburban 1500 5.3 lt Z engine
Vehicle: 2004 Chevrolet surburban 1500 5.3 lt Z engine Read more: http://www.autocodes.com/qa/ask

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P1626 loss of serial communication with VTD 

Do a learn procedure, there a 10 minutes this is with a factory scan tool or a 30 minute without a scan tool

30 Minute Learn Procedure 

  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to start the engine, then release the key to ON; the 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 Passlock Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK.
  6. Start the engine. The vehicle has now learned the Passlock Sensor Data Code and/or password.

IMPORTANT: The vehicle learns 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.

If you want to do away with the alarm for good, get the vehicle to start, and access the ignition base, there are 3 wire yellow, white and black, with the car RUNNING cut the yellow wire ( not to be confused with the airbag) and say good bye to P1626 forever this is very adviseable you can be dealing with a failing BCM 

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