Chevrolet Silverado / GMC Sierra. Service manual — part 714

simultaneously control the traction control. The EBCM sends a serial data message to the ECM
requesting torque reduction. When certain ECM DTCs are set, the ECM will not be able to
perform the torque reduction for traction control. A serial data message is sent to the EBCM
indicating that traction control is not allowed.

Conditions for Running the DTC

The ignition is ON.

Ignition voltage is greater than 8 volts.

Conditions for Setting the DTC

The ECM diagnoses a condition preventing the engine control portion of the traction control
function and sends a serial data message to the EBCM indicating that torque reduction is not
allowed. The ECM will typically set a DTC and the EBCM will set this DTC.

Action Taken When the DTC Sets

The EBCM disables the TCS for the duration of the ignition cycle.

The Traction Off indicator turns ON.

The DIC displays the Service Traction Control message.

The ABS remains functional.

Conditions for Clearing the DTC

The condition for the DTC is no longer present and the DTC is cleared with a scan tool.

The electronic brake control module (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

2008 Chevrolet Silverado 1500

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

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

Verify that no DTCs are set in the ECM.

If DTCs are set, refer to Symptoms - Engine Controls .

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References

DTC C0245

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 C0245 00

Wheel Speed Sensor Frequency Error

DTC C0245 5A

Wheel Speed Sensor Plausibility Failure

2008 Chevrolet Silverado 1500

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

Diagnostic Fault Information

Circuit/System Description

The wheel speed sensor receives a 12-volt power supply voltage from the electronic brake
control module (EBCM) and provides an output signal to the EBCM. As the wheel spins, the
wheel speed sensor sends the EBCM a DC square wave signal. The EBCM uses the frequency of
the square wave signal to calculate the wheel speed.

Conditions for Running the DTC

The ignition is ON.

Ignition voltage is greater than 9.5 volts.

No wheel speed sensor faults exist.

Brake is not applied.

Vehicle is not cornering.

No wheel spinning is detected.

Conditions for Setting the DTC

Wheel speed differences between one wheel and the others is greater than 25 percent.

Action Taken When the DTC Sets

Antilock Brake System (ABS), Traction Control System (TCS) and Vehicle Stability
Enhancement System (VSES) are disabled for the remainder of the ignition cycle.

The ABS and Stabilitrak indicator turns ON.

The service Traction Control and Stabilitrak displays on the DIC.

Conditions for Clearing the DTC

The DTC becomes history when the conditions for setting the DTC are no longer present.

The history DTC clears after 100 malfunction-free ignition cycles.

The EBCM receives a clear code command from the scan tool.

Diagnostic Aids

Circuit

Short to

Ground

Open/High

Resistance

Short to

Voltage

Signal

Performance

Wheel Speed Sensor Frequency
Error

-

-

-

C0245 00, 5A

2008 Chevrolet Silverado 1500

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

Faulty wheel speed sensor will not set this DTC.

A vehicle using a space saver spare will not set this code.

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

Circuit/System Verification

Inspect for one tire that has improper air pressure or improper size.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

DTC C0252

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

2008 Chevrolet Silverado 1500

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