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Chevrolet Silverado / GMC Sierra. Manual - part 1693
Circuit/System Verification
1. Engine running, accessories OFF, measure and record the battery voltage at the battery
terminals. The voltage should be between 12.6 and 15.0 volts.
If not within the specified range, refer to Charging System Test.
2. Observe the scan tool Battery Voltage Signal (EBCM) or Ignition 1 Signal (PTO)
parameter in the data list of the module setting the DTC. The reading should be between
12.6 and 15.0 volts.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the module that set the DTC.
2. Ignition OFF, test for less than 5 ohms between the ground circuit terminals listed below
and ground.
Terminal 1 (M1F PTO)
Terminal 11 (JH6/JH7 EBCM)
Terminal 28 (JF3/JF7 EBCM)
Terminal 38 (JL4 EBCM)
If greater than the specified range, test the ground circuit for an open/high resistance.
3. Verify that a test lamp illuminates between the B+ circuit terminals listed below and
ground.
Terminal 1 (JH6/JH7 EBCM)
Terminal 25 (JF3/JF7/JL4 EBCM)
Terminal 32 (M1F PTO)
If the test lamp does not illuminate, test the B+ circuit for a short to ground or an
open/high resistance.
4. If all circuits tests normal, replace the appropriate module.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM or PTOM replacement, setup and programming
DTC C0900
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC C0900 00
Device Voltage High - EBCM
Diagnostic Fault Information
Circuit/System Description
The electronic brake control module (EBCM) monitors the battery positive (B+) voltage. If the
voltage level is too high, damage may result in the system. When a high voltage condition is
detected the EBCM turns OFF the system relay which removes battery voltage from the solenoid
valves and pump motor, and DTC C0900 00 sets.
Conditions for Running the DTC
Ignition is ON.
Conditions for Setting the DTC
The system voltage is greater than 16 volts for 100 msec.
Action Taken When the DTC Sets
The traction control system (TCS) and vehicle stability enhancement system (VSES) are
disabled for the duration of the ignition cycle.
The antilock brake system (ABS) is disabled if ignition voltage exceeds 19.5 volts.
The stability system off and traction control off indicators turn ON.
The ABS indicator turns ON if voltage exceeds 19.5 volts.
Conditions for Clearing the DTC
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
B+
C0899 00,
C0899 03
C0899 00,
C0899 03
-
-
Ground
-
C0899 00,
C0899 03
-
-
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
The condition for the DTC is no longer present.
The EBCM automatically clears the history DTC when a current DTC is not detected in 100
consecutive drive cycles.
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.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Starting and Charging Schematics
Power Distribution Schematics
Ground Distribution Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Charging System Description and Operation
ABS Description and Operation (With JL4) or ABS Description and Operation
(Without JL4)
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
Control Module References
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Circuit/System Verification
1. Engine running, accessories OFF, measure and record the voltage at the battery voltage at
the battery terminals. The voltage should be between 12.6 and 15.0 volts.
If not within the specified range, refer to Charging System Test.
2. Observe the scan tool EBCM Battery Voltage parameter. The reading should be between
12.6 and 15.0 volts.
If not within the specified range, replace the EBCM.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup and programming
DTC P0562
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 P0562
System Voltage Low
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.
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
B+
P0562
P0562
-
-
Ground
-
P0562
-
-
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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