Chevrolet Silverado / GMC Sierra. Service manual — part 1688
Fig. 2: Charging (Gas)
Courtesy of GENERAL MOTORS CORP.
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 3: Charging (Diesel)
Courtesy of GENERAL MOTORS CORP.
AUXILIARY BATTERY SCHEMATICS
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 4: Auxiliary Battery Schematic
Courtesy of GENERAL MOTORS CORP.
DIAGNOSTIC INFORMATION AND PROCEDURES
DIAGNOSTIC CODE INDEX
DIAGNOSTIC CODE INDEX
DTC
Description
DTC B1325
B1325 03: Device Power Circuit Voltage Below Threshold
B1325 07: Device Power Circuit Voltage Above Threshold
B1325 4A: Device Power Circuit Checksum Error - IPC
DTC B1424
B1424 00: Device Voltage Low - Theft Deterrent Module
DTC B1516
B1516 08: Battery Current Sensor Performance Signal Invalid
B1516 66: Battery Current Sensor Performance Wrong
Mounting Position
DTC B1517
B1517 03: Battery Voltage Below Threshold - BCM
B1517 07: Battery Voltage Above Threshold - BCM
B1517 5A: Battery Voltage Plausibility Failure - BCM
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
DIAGNOSTIC STARTING POINT - ENGINE ELECTRICAL
Begin the system diagnosis with Diagnostic System Check - Vehicle . The Diagnostic System
Check - Vehicle will provide the following information:
The identification of the control modules which command the system
The ability of the control modules to communicate through the serial data circuit
The identification of any stored diagnostic trouble codes (DTCs) and their status
The use of the Diagnostic System Check - Vehicle will identify the correct procedure for
diagnosing the system and where the procedure is located.
DTC B1325
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B1325 03
Device Power Circuit Voltage Below Threshold
DTC B1325 07
Device Power Circuit Voltage Above Threshold
DTC B1527
B1527 00: High Parasitic Load
DTC C0899
C0899 00: Device Voltage Low - EBCM (JF3/JF7/JH6/JH7)
C0899 03: Device Voltage Low - EBCM (JL4), PTO (M1F)
DTC C0900
C0900 00: Device Voltage High - EBCM
DTC P0562
P0562: System Voltage Low
DTC P0563
P0563: System Voltage High
DTC P0615
P0615: Starter Relay Control Circuit
DTC P0621
P0621: Generator L-Terminal Circuit
DTC P0622
P0622: Generator F-Terminal Circuit
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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