Antilock Brake System - Non-Hybrid Greater than/Equal to 3900 kg (8600 lb) GVW

DTC C0245

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructionsprovides an overview of each diagnostic category.

DTC Descriptor
DTC C0245
- Wheel Speed Sensor Frequency Error

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

* 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 Non-Hybrid Greater than/Equal to 3900 kg (8600 lb) GVW
Connector End View Reference

Component Connector End Views Connector End Views By Name
Description and Operation

ABS Description and Operation ABS (Non-Hybrid Greater than/Equal to 3900 kg (8600 lb) GVW)
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearningfor scan tool information

Circuit/System Verification

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