C0245

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 5A
- Wheel Speed Sensor Frequency Error Plausibility Failure




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.