Diagnostic Aids

WARNING: This page is about a different car, the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Observe the driver information center (DIC) messaging that would indicate the electrical system requires service.
Inspect for loose or damaged terminals at the generator.
Inspect for loose or worn generator drive belt.
Use the scan tool in order to inspect all other modules for voltage related DTCs.
Running the engine with a battery charger attached may cause DTC P0563 to set.
Inspect the charging circuit for high resistance.
Inspect the vehicle battery for open or sulfated cells.