Chevrolet Silverado / GMC Sierra. Service 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