C0045

DTC C0045 or C0050

Circuit Description

As the wheel spins, the wheel speed sensor produces an AC signal. The electronic brake control module (EBCM) uses the frequency of the AC signal to calculate the wheel speed.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

- DTC C0045 Left Rear Wheel Speed Sensor Circuit
- DTC C0050 Right Rear Wheel Speed Sensor Circuit

Conditions for Running the DTC

- The ignition is ON.
- The vehicle speed is greater than 13 km/h (8 mph).

Conditions for Setting the DTC

Any of the following conditions may cause the DTC to set.

- The EBCM detects an open wheel speed sensor circuit for 500 milliseconds.
- The EBCM detects a shorted wheel speed sensor circuit for 500 milliseconds.
- The EBCM detects the absence of a wheel speed sensor signal for 5 seconds. If more than one absent wheel speed sensor signal is detected, the condition must be present for 120 seconds to set DTCs.
- The EBCM detects an erratic wheel speed sensor signal for 200 milliseconds.

Action Taken When the DTC Sets

- The EBCM disables antilock brake system (ABS)/traction control system (TCS)/vehicle stability enhancement system (VSES) and may disable dynamic rear proportion (DRP) if more than one wheel speed sensor DTC is set.
- The ABS indicator turns ON.
- The traction off indicator turns ON.
- The brake warning indicator may turn ON.
- The message center displays the service stability system message.

The actions above are maintained during subsequent ignition cycles until the EBCM completes a power up self-test. This test concludes when the vehicle achieves a speed greater than 13 km/h (8 mph) and the wheel speeds are verified by the EBCM.

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

Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:

- Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
- Connector Repairs
- Testing for Electrical Intermittents Testing for Electrical Intermittents
- Wiring Repairs

If the customer's concern is that the ABS indicator is on only during humid conditions such as rain, snow or vehicle wash, thoroughly inspect the wheel speed sensor circuits for signs of water intrusion. Use the following procedure in order to help isolate the problem area:

1. Spray the suspected area with a 5 percent salt water solution.
2. Operate the vehicle at a speed greater than 13 km/h (8 mph) for at least 30 seconds.

Repair or replace the suspect harness if the DTC sets.