Action Taken When the DTC Sets

WARNING: This page is about a different car, the 2002 GMC Safari, 2002 Chevrolet Astro, 2001 GMC Safari, and 2001 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

The BCM stores DTC B2947 in memory.
The BCM sends a message to the instrument cluster to turn the SECURITY indicator ON.
In addition, the BCM will take one of two actions:
- If the Passlock sensor power circuit is shorted to ground when attempting to start the engine, the BCM will NOT send a message to the PCM to enable fuel delivery to the engine. The vehicle will exhibit an engine no start or starts then stalls condition.
- If the Passlock sensor power circuit is shorted to ground after the engine has started, the BCM enters a fail-enable mode. Upon subsequent engine start attempts, the BCM will send a password message to the PCM via the Class 2 serial data link to enable fuel delivery to the engine. The engine will start.