Chevrolet Silverado / GMC Sierra. Service manual — part 716

1. With the scan tool perform the Steering Angle Sensor Calibration.

2. Operate the vehicle within the conditions for setting the DTC. Verify DTC C0186, C0196,

C0253, or C0710 are not set.

If DTC C0186, C0196, or C0710 are set, refer to Diagnostic Trouble Code (DTC)
List - Vehicle .

If only DTC C0253 set, replace the yaw and lateral acceleration sensor. If DTC C0253 sets
again, replace the EBCM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement

Control Module References for EBCM replacement, setup, and programming

DTC C0299

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 C0299 00

Brake Booster Sensor Performance

DTC C0299 5A

Brake Booster Sensor Plausibility Failure

DTC C0299 31

Brake Booster General Checksum Failure

Diagnostic Fault Information

Short to

Open/High

Short to

Signal

2008 Chevrolet Silverado 1500

2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Circuit/System Description

The electronic brake control module (EBCM) provides a bi-directional power, and ground
circuits to the power brake booster actuator. The power brake booster actuator converts
electrical inputs into a mechanical force to apply the brake booster to assist the driver as
necessary in stability control. The EBCM monitors the vacuum level in the power brake booster,
and will set a DTC if the vacuum is too low.

Conditions for Running the DTC

The ignition is ON.

Ignition voltage is greater than 9 volts.

The engine is running for the vacuum related fault to set.

Conditions for Setting the DTC

A condition in which no vacuum is detected in the power brake booster for approximately
10 seconds after start-up.

A condition in which low vacuum is detected in the power brake booster for approximately
60 seconds or longer after start-up, or is detected while driving.

Conditions for Clearing the DTC

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.

Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Circuit

Ground

Resistance

Voltage

Performance

Power Brake Booster High
Control Circuit

C0299 00

C0299 00

C0299 00

C0299 5A, 31

Power Brake Booster Low
Control Circuit

-

C0299 00

C0299 00

C0299 5A, 31

2008 Chevrolet Silverado 1500

2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Component Connector End Views

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 for Scan Tool Information

Circuit/System Verification

1. DTC C0299 will set as result of power brake booster actuator or circuit failure, test for

power, and ground circuits to the EBCM. These electrical failures will typically be set
immediately after key-up.

Test and repair the EBCM power or ground circuits if necessary.

2. DTC C0299 will set as result of the power brake booster vacuum is too low. These will be

set approximately 10 seconds or more after start-up, and may be intermittent.

Locate and repair the source of the vacuum leak. Refer to Brake System Vacuum
Source Test .

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector from the power brake booster actuator.

2. Test for less than 25.0 ohm of resistance between the harness connector terminal 5 and

ground.

If greater than 25.0 ohm, test the ground circuit for an open/high resistance.

IMPORTANT: It is recommend that Component Testing is performed before

Circuit Testing when diagnosing the power brake booster
actuator.

2008 Chevrolet Silverado 1500

2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

3. Connect a test lamp between the actuator harness connector terminal 1 and terminal 5.

4. Ignition ON, command the Active Brake Booster to ON and OFF with a scan tool.

If the test lamp remains OFF during the commands, test for a short to ground or an
open/high resistance on either control circuit. If the circuits test normal, replace the
electronic brake control module EBCM.

If the test lamp is always ON, test the control circuits for a short to battery positive. If
the circuit tests normal, locate and repair the source of the vacuum leak.

5. If all circuits test normal, test or replace the vacuum brake booster assembly.

6. If all circuits test normal, and no vacuum leaks were found, replace the electronic brake

control module (EBCM).

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup, and programming

DTC C0455

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 C0455 00

Front Steering Position Sensor Circuit

Diagnostic Fault Information

Circuit

Short to

Ground

Open/High

Resistance

Short to
Voltage

Signal

Performance

Steering Angle Sensor 5-Volt
Reference Circuit

C0455

C0455

C0455

-

Steering Angle Sensor Signal
Circuit

C0455

C0455

C0455

-

Low Reference Circuit

-

C0455

-

-

2008 Chevrolet Silverado 1500

2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado