Circuit/System Verification
WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
Use the scan tool to observe the Powertrain HS Comm. Cmd. parameter in the BCM data list, while turning the ignition switch. The reading should match the normal range of the typical scan tool data above.
If all parameters are all correct and the DTC is current, replace the BCM.