Diagnostic Instructions
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.
