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Engine Electrical DTCS

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
ENGINE ELECTRICAL DIAGNOSTIC TROUBLE CODE (DTC) LIST

DTC Description
DTC B1327 System Voltage Low
DTC B1328 System Voltage High
DTC P0562 System Voltage Low
DTC P0563 System Voltage High
DTC P0621 Generator L-Terminal Circuit
DTC P0622 Generator F-Terminal Circuit
DTC P1633 Ignition 0 Switch Circuit
DTC P1637 Generator L-Terminal Circuit
DTC P1638 Generator F-Terminal Circuit