For 1990-2009 cars

### Circuit Description

As the wheels spin, each wheel speed sensor produces a digital square wave signal. The electronic brake control module (EBCM) uses the frequency of these signals to calculate each wheel speed.

### DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C0245 Wheel Speed Sensor Frequency Error

### Conditions for Running the DTC

• | The ignition is ON.

• | The vehicle speed is between 22 km/h (14 mph) and 110 km/h (69 mph).

• | No brake application or deceleration is detected.

• | No wheel slip is detected.

• | No turning maneuvers are detected.

### Conditions for Setting the DTC

The average front wheel speed differs from the rear wheel speed by at least 20 percent for 4 seconds.

### Action Taken When the DTC Sets

• | The EBCM disables the Antilock Brake System (ABS)/traction control switch (TCS)/dynamic rear proportion (DRP).

• | The ABS Fault message is displayed.

• | The traction fault message is displayed.

• | The brake warning indicator turns ON.

### Conditions for Clearing the DTC

The Conditions for Setting the DTC are no longer present and you use the scan tool Clear DTCs function.

### Diagnostic Aids

Operating the vehicle with a tire that has very low air pressure may set this DTC.

Step | Action | Yes | No
--- | --- | --- | ---
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 | Inspect all of the tires on the vehicle to ensure that all of the tires are of equal size. Did you find and correct the condition? | Go to Step 4 | Go to Step 3
3 | Inspect the wheel speed sensors and tone rings for damage, incorrect application, or incorrect installation. Did you find and correct the condition? | Go to Step 4 | Go to Diagnostic Aids
4 |

1. Use a scan tool to clear the DTCs.
2. Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK