C0040

DTC C0035-C0051





Circuit Description
As the wheels spin, each wheel speed sensor produces an AC signal. The electronic brake control module (EBCM) uses the frequency of the AC signals to calculate each wheel speed.

DTC Descriptors
This diagnostic procedure supports the following DTCs:
^ DTC C0035 Left Front Wheel Speed Sensor Circuit Malfunction
^ DTC C0036 Left Front Wheel Speed Sensor Circuit Range/Performance
^ DTC C0040 Right Front Wheel Speed Sensor Circuit Malfunction
^ DTC C0041 Right Front Wheel Speed Sensor Circuit Range/Performance
^ DTC C0045 Left Rear Wheel Speed Sensor Circuit Malfunction
^ DTC C0046 Left Rear Wheel Speed Sensor Circuit Range/Performance
^ DTC C0050 Right Rear Wheel Speed Sensor Circuit Malfunction
^ DTC C0051 Right Rear Wheel Speed Sensor Circuit Range/Performance

Conditions for Running the DTC
^ The ignition is ON.
^ The vehicle speed is greater than 40 km/h (25 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.
^ The EBCM detects a shorted wheel speed sensor circuit.
^ The EBCM detects the absence of a wheel speed sensor signal.
^ The EBCM detects an erratic wheel speed sensor signal.

Action Taken When the DTC Sets
^ The EBCM disables the antilock brake system/traction control system (TCS) and may disable the dynamic rear proportion (DRP), if more than one wheel speed sensor (WSS) DTC is set.
^ The ABS indicator turns ON.
^ The traction off indicator turns ON.
^ The brake warning indicator may turn 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





Thoroughly inspect connections or circuitry that may cause an intermittent malfunction.
If the customer concern is that the ABS indicator is ON only during humid conditions such as rain, snow, or vehicle wash, thoroughly inspect the WSS 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.