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
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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