Diagnostic Aids

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

A low voltage DTC in multiple modules indicates a concern in the charging system.
Inspect the ground connection G300 to verify that it is clean and tight.