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Chevrolet Silverado / GMC Sierra. Manual - part 1694
Conditions for Running the DTC
The vehicle speed is greater than 8 km/h (5 mph).
The system voltage is between 9.5-18 volts.
Conditions for Setting the DTC
The ECM detects a system voltage less than 10 volts for 5 seconds.
Action Taken When the DTC Sets
The ECM will command the charge indicator to be illuminated on the instrument panel
cluster (IPC).
The ECM will not illuminate the malfunction indicator lamp (MIL).
The ECM will store conditions, which were present when the DTC set as Fail Records data
only.
Conditions for Clearing the DTC
The ECM will command the message OFF after one trip in which the diagnostic test has
been run and passed.
The history DTC will clear after 40 consecutive warm-up cycles have occurred without a
malfunction.
Diagnostic Aids
A low voltage DTC in multiple modules indicates a concern in the charging system.
Inspect the ECM gound connection G106 (4.3L LU3) or G103 (all other engines) to insure
that they are clean and tight.
Reference Information
Schematic Reference
Starting and Charging Schematics
Engine Controls Schematics 4.3L (LU3)
Engine Controls Schematics 6.6L (LMM)
Engine Controls Schematics all other engines (w/o LU3 or LMM)
Connector End View Reference
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Component Connector End Views
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
Control Module References for Scan Tool Information
Circuit/System Verification
1. Ignition On. Measure and record the voltage at the battery terminals. Verify that the battery
voltage is 12-17 volts. Repeat with the engine running.
If the battery voltage is not within the specified range, go to Charging System Test.
2. Engine running. Observe the Ignition 1 Signal parameter in the ECM scan tool data list.
Verify that the scan tool displays a value that is within 1 volt of the battery voltage recorded
in step 1.
If the scan tool parameter is not within the specified range, go to Circuit/System
Testing.
3. Go to Diagnostic Aids.
Circuit/System Testing
1. Ignition OFF. Disconnect the harness connector of the ECM.
2. Probe the ground circuits with a test lamp that is connected to B+. The test lamp should
illuminate.
If the test lamp does not illuminate, then test the ground circuit for an open/high
resistance.
3. Test for 11-14 volts between the battery positive voltage and the ground circuits of the
ECM.
If not within the specified range, test the battery positive voltage circuits for a short to
ground or an open/high resistance.
4. If all circuits test normal, replace the ECM.
Repair Procedures
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming.
DTC P0563
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 Descriptor
DTC P0563
System Voltage High
Diagnostic Fault Information
Circuit/System Description
The engine control module (ECM) monitors the system voltage to ensure that the voltage stays
within the proper range. Damage to components, and incorrect data may occur when the voltage
is out of range.
Conditions for Running the DTC
The vehicle speed is greater than 8 km/h (5 mph).
The system voltage is between 9.5-18 volts.
Conditions for Setting the DTC
The ECM detects a system voltage above 16 volts for 1 second.
Action Taken When the DTC Sets
The ECM will command the charge indicator to be illuminated on the instrument panel
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
B+
P0562
P0562
-
-
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
cluster (IPC).
The ECM will not illuminate the malfunction indicator lamp (MIL).
The ECM will store conditions, which were present when the DTC set as Fail Records data
only.
Conditions for Clearing the DTC
The ECM will command the indicator OFF after one trip in which the diagnostic test has
been run and passed.
A history DTC will clear after 40 consecutive warm-up cycles have occurred without a
malfunction.
Reference Information
Starting and Charging Schematics
Engine Controls Schematics 4.3L (LU3)
Engine Controls Schematics 6.6L (LMM)
Engine Controls Schematics all other engines (w/o LU3 or LMM)
Connector End View Reference
Component Connector End Views
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Diagnostic Aids
This DTC could be set by overcharging with a battery charger or jump starting.
A high voltage DTC in multiple modules indicates a concern in the charging system.
Circuit/System Verification
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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