Chevrolet Silverado / GMC Sierra. Service manual — part 713

Circuit/System Verification

1. Ignition ON, observe the scan tool Lateral Accelerometer Signal parameter. The reading

should be 2.3-2.7 volts.

2. Ignition ON, observe the scan tool Yaw Rate Sensor parameter. The reading should be 2.3-

2.7 volts.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the yaw rate/lateral accelerometer.

2. Test for less than 2 ohms of resistance between the ground circuit terminal 1 and ground.

If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, test for 11.8 - 12.2 volts between the 12-volt reference circuit terminal 4 and

ground.

If less than the specified range, test the 12-volt reference circuit for a short to ground
or an open/high resistance. If the circuit tests normal, replace the EBCM.

4. Test for 5.5-7.0 volts between the CAN circuit terminal 3 and ground.

If greater than the specified range, test the CAN circuit for a short to voltage. If the
circuit tests normal, replace the EBCM.

If less than the specified range, test the CAN circuit for a short to ground or an
open/high resistance. If the circuit tests normal, replace the EBCM.

5. Test for 5.5-7.0 volts between the CAN circuit terminal 2 and ground.

If greater than the specified range, test the CAN circuit for a short to voltage. If the
circuit tests normal, replace the EBCM.

If less than the specified range, test the CAN circuit for a short to ground or an
open/high resistance. If the circuit tests normal, replace the EBCM.

6. Test for infinite ohm of resistance between the CAN circuit High, and Low terminals 2 and

3.

If less than the specified range, test the CAN circuits for a shorted to each other. If the
circuit tests normal, replace the EBCM.

7. If all circuits test normal, test or replace the yaw rate/lateral accelerometer sensor.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup and programming

2008 Chevrolet Silverado 1500

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

DTC C0201

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 C0201 00

Antilock Brake System (ABS) Enable Relay Contact Circuit

DTC C0201 04

Antilock Brake System (ABS) Enable Relay Contact Circuit Open

DTC C0201 0E

Antilock Brake System (ABS) Enable Relay Contact Circuit Resistance Below Threshold

Circuit/System Description

The solenoid relay, located within the electronic brake control module (EBCM), supplies battery
voltage to all of the valve solenoids.

Conditions for Running the DTC

Ignition voltage is greater than 9.5 volts.

The solenoid relay is commanded ON.

Conditions for Setting the DTC

One or more of the following conditions exists:

The EBCM detects an open in the battery positive voltage circuit to the solenoid valve
relay.

The EBCM detects a stuck open solenoid valve relay or an open circuit between the
solenoid valve relay and solenoid valves.

Action Taken When the DTC Sets

2008 Chevrolet Silverado 1500

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

The EBCM disables the antilock brake system (ABS)/traction control system
(TCS)/dynamic rear proportion (DRP) for the duration of the ignition cycle.

The ABS indicator turns ON.

The Traction Control indicator turns ON.

The red brake warning indicator turns ON.

The driver information center (DIC) displays the SERVICE BRAKE
SYSTEM/TRACTION SYSTEM message.

Conditions for Clearing the DTC

The condition for setting 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

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

2008 Chevrolet Silverado 1500

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

Circuit/System Verification

Ignition ON, observe the scan tool EBCM Battery Voltage Signal parameter. The reading should
be battery voltage.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the EBCM.

2. Test for less than 2 ohm of resistance between the ground terminals 38 and 12 to ground.

If greater than the specified range, test the ground circuits for an open/high resistance.

3. Verify that a test lamp illuminates between the B+ terminals 25 and 13 and ground.

If the test lamp does not illuminate, test the B+ circuits for a short to ground or an
open/high resistance.

4. If all circuits test normal, 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 C0242

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 C0242 00

Engine Control Module (ECM) Indicated TCS Malfunction

DTC P0856

Engine Control Module (ECM) Indicated TCS Malfunction

Circuit/System Description

The electronic brake control module (EBCM) and the engine control module (ECM)

2008 Chevrolet Silverado 1500

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