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 Instructions) provides 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 (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

ABS Description and Operation (ABS Description and Operation)
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 Relearning) for scan tool information

Circuit/System Verification

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