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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 945 (IMMOBILIZER SYSTEM)DESCRIPTION AND OPERATIONIMMOBILIZER DESCRIPTION AND OPERATIONBODY CONTROL MODULE
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Body Control Module

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Body Control Module
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2007 GMC Savana Special, 2007 GMC Savana Camper Special, 2007 GMC Savana, 2007 Chevrolet RV Cutaway, and 2007 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

The body control module (BCM) contains the theft deterrent system logic. The BCM reads the Passlock™ data from the Passlock™ sensor. If the Passlock™ data is correct, the BCM will pass theft. The BCM will then transmit the fuel continue password to the vehicle control module (VCM)/powertrain control module (PCM).

During the tamper mode, the vehicle may start. The vehicle will then stall. If the BCM receives the wrong Passlock™ data, the vehicle theft deterrent (VTD) will immediately go into the tamper mode. The tamper mode will lock-out the vehicle fuel injectors for 10 minutes. The SECURITY indicator will flash while the VTD is in the tamper mode.

If the Passlock™ sensor sends a correct password to the BCM when the ignition is in the ON position, the BCM will send a fuel enable signal to the VCM/PCM. The VCM/PCM will not disable the fuel due to any BCM message for the remainder of the ignition cycle.

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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