Conditions for Setting the DTC

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

When the BCM detects a short to ground in the stop lamp supply voltage circuit to the CHMSL.
When the BCM never detects an open, indicating a BCM fault.
When the BCM detects a short to ground in the stop lamp supply voltage circuit to another module.