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Diagnostic Trouble Code Definitions

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC TROUBLE CODE DEFINITIONS

DTC (1) Description
B1327  Device Power Circuit Low
B1328  Device Power Circuit High
P0562  Low System Voltage
P0563  High System Voltage
P0621  Generator Turn-On Signal Circuit Voltage Out-Of-Range
P0622  Out Of Range Duty Cycle Signal
P1633 (2) Improper Ignition 0 Input
P1634  Improper Ignition 1 Input
P1637  Generator Turn-On Signal Circuit Voltage Out-Of-Range
P1638  Out-Of-Range Duty Cycle Signal
(1) Codes listed in this table are only for testing covered in this article. For complete DTC listing, see appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
(2) See DTC P1633: IGNITION 0 CIRCUIT PERFORMANCE under DIAGNOSTIC TESTS under SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
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