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Diagnostic Trouble Code Definitions

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DTC (1) Description
P0562  Low System Voltage
P0563  High System Voltage
P1637  Generator Turn On Signal Circuit Voltage Out Of Range
P1638  Pulse Width Modulated Signal Out Of Range
(1) Codes listed in this table are only for testing covered in this article. For complete DTC listing, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in BODY CONTROL MODULES - CHEVY EXPRESS & SAVANNA article in COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.
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