C0245

DTC C0245

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

DTC Descriptor
DTC C0245
- Wheel Speed Sensor Frequency Error

Circuit/System Description

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

Conditions for Running the DTC

* Ignition voltage is greater than 8 volts.
* Vehicle must be moving at a speed greater than 30 km/h.

Conditions for Setting the DTC

* The difference between 2 wheel speeds exceeds 20 percent.
* The fault must be present for greater than 60 seconds.

Action Taken When the DTC Sets

* The EBCM disables the Antilock Brake System (ABS)/Traction Control System (TCS)/Vehicle Stability Enhancement System (VSES) for the duration of the ignition cycle.
* The ABS indicator turns ON.
* The driver information center (DIC) displays the ABS FAULT message.
* The Stability Caution indicator turns on.
* The DIC displays the SERVICE STAB SYS message.
* The DIC displays the TRACTION FAILED message.

Conditions for Clearing the DTC

* The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
* The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

Inspect tires for improper air pressure or improper size.

Reference Information
Schematic Reference

Antilock Brake System Schematics ([1][2]Antilock Brakes / Traction Control Systems)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

ABS Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for Scan Tool Information

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Brake Pressure Modulator Valve Replacement (Service and Repair)
* Electronic Brake Control Module Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for EBCM replacement, setup, and programming