C0045

DTC C0035-C0050

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



DTC Descriptors
DTC C0035 02
- Left Front Wheel Speed Sensor Circuit Short to Ground

DTC C0035 05
- Left Front Wheel Speed Sensor Circuit Short to Battery or Open

DTC C0035 0F
- Left Front Wheel Speed Sensor Circuit Erratic Signal

DTC C0035 18
- Left Front Wheel Speed Sensor Circuit Signal Amplitude Less Than Minimum

DTC C0040 02
- Right Front Wheel Speed Sensor Circuit Short to Ground

DTC C0040 05
- Right Front Wheel Speed Sensor Circuit Short to Battery or Open

DTC C0040 0F
- Right Front Wheel Speed Sensor Circuit Erratic Signal

DTC C0040 18
- Right Front Wheel Speed Sensor Circuit Signal Amplitude Less Than Minimum

DTC C0045 02
- Left Rear Wheel Speed Sensor Circuit Short to Ground

DTC C0045 05
- Left Rear Wheel Speed Sensor Circuit Short to Battery or Open

DTC C0045 0F
- Left Rear Wheel Speed Sensor Circuit Erratic Signal

DTC C0045 18
- Left Rear Wheel Speed Sensor Circuit Signal Amplitude Less Than Minimum

DTC C0050 02
- Right Rear Wheel Speed Sensor Circuit Short to Ground

DTC C0050 05
- Right Rear Wheel Speed Sensor Circuit Short to Battery or Open

DTC C0050 0F
- Right Rear Wheel Speed Sensor Circuit Erratic Signal

DTC C0050 18
- Right Rear Wheel Speed Sensor Circuit Signal Amplitude Less Than Minimum




Diagnostic Fault Information






Circuit/System Description

The wheel speed sensor receives ignition voltage from the electronic brake control module (EBCM) and provides a DC square wave signal back to the module. As the wheel spins, the EBCM uses the frequency of the square wave signal to calculate the wheel speed.


Conditions for Running the DTC


C0035-C0050 18
* No other wheel speed circuit DTCs are set.
* The system voltage is greater than 8 volts.
* The ignition is ON.
* The brake pedal is not pressed.
* Two or three other wheel speeds are greater than 0 km/h.



C0035-C0050 0F
* The ignition is ON.
* Ignition voltage is greater than 8 volts.
* The brake pedal is not pressed.
* A DTC is not set for the other wheel speed circuit on the same axle.



C0035-C0050 02, 05,
* The ignition is ON.
* Ignition voltage is greater than 8 volts.



Conditions for Setting the DTC

C0035-C0050 0F,

The code is set when both of the following conditions exist:

* An erratic signal output of the wheel speed sensor is detected.
* The EBCM detects a change in wheel speed that exceeds 20 km/h (12 mph) between two 10 millisecond wheel speed samples.
* The condition occurs 3 times in 200 milliseconds.


C0035-C0050 02, 05,

The code is set when either of the following conditions exist:

* A short to ground, open/high resistance is detected on the wheel speed sensor signal circuit.
* A short to voltage, short to ground or an open/high resistance is detected on the low reference circuit.
* Wheel speed sensor power supply is less than 7.6 volts.
* A missing wheel speed sensor signal



Actions Taken when the DTC Sets

If equipped, the following actions occur:

* The EBCM disables the antilock brake system (ABS) and the traction control system (TCS) for the duration of the ignition cycle.
* The ABS indicator turns ON.
* The traction control off indicator turns ON.
* If the other wheel speed sensor on the same axle sets an additional DTC, the EBCM disables the dynamic rear proportioning (DRP) for the duration of the ignition cycle.
* When the EBCM disables DRP, the red brake warning indicator turns ON.



Conditions for Clearing the DTC

* A current DTC clears when the diagnostic runs and passes.
* A history DTC clears after 100 consecutive ignition cycles, if no failures are reported by this diagnostic.



Diagnostic Aids

* Inspect the back of the wheel bearing on the encoder surface for metal debris that could cause an erratic reading with the sensor. Do not use a magnet to clean the debris, or damage to the encoder ring may occur.
* If 2 or more wheel speed sensors are inoperative diagnose each wheel speed sensor individually.
* An ECE 13 response may be required, after repairs are made, and DTCs are cleared, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test, and the EBCM will turn off the ABS indicator.


If the customer comments that the ABS indicator is ON only during moist environmental conditions: rain, snow, vehicle wash, etc., inspect the wheel speed sensor wiring for signs of water intrusion. If the DTC is not current, clear all DTCs and simulate the effects of water intrusion by using the following procedure:

1. Spray the suspected area with a 5 percent saltwater solution. To create a 5 percent saltwater solution, add 2 teaspoons of salt to 8 fl oz of water (10 g of salt to 200 ml of water).
2. Test drive the vehicle over various road surfaces: bumps, turns, etc., above 40 km/h (25 mph) for at least 30 seconds.
3. Rinse the area thoroughly when completed.



Reference Information
Schematic Reference

Antilock Brake System Schematics ([1][2]Antilock Brakes / Traction Control Systems)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

ABS Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for Scan Tool Information


Circuit/System Verification

Observe the scan tool Wheel Speed Sensor parameter. The reading should be the same speed on all sensors when driving in a straight line at a speed greater than 20 km/h (13 mph).


Circuit/System Testing

Important: It is recommended that Component Testing is performed before Circuit Testing when diagnosing wheel speed sensors.



1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Ignition ON, test for less than 1 volt between the low reference circuit terminals of the appropriate sensor listed below and ground .

* LF Sensor circuit terminal 28
* RF Sensor circuit terminal 17
* LR Sensor circuit terminal 4
* RR Sensor circuit terminal 3


• If greater than the specified value, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the wheel speed sensor

3. Test for less than 1 volt between the signal circuit terminals of the appropriate sensor listed below and ground.

* LF Sensor circuit terminal 29
* RF Sensor circuit terminal 6
* LR Sensor circuit terminal 5
* RR Sensor circuit terminal 2


• If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the wheel speed sensor.

4. Ignition OFF, test for infinite resistance between the low reference terminals of the appropriate sensor listed below and ground.

* LF Sensor circuit terminal 28
* RF Sensor circuit terminal 17
* LR Sensor circuit terminal 4
* RR Sensor circuit terminal 3


• If less than the specified value, test the low reference circuit for a short to ground. If the circuit tests normal, test or replace the wheel speed sensor.

5. Test for infinite resistance between the following signal circuit terminals of the appropriate sensor listed below and ground.

* LF Sensor circuit terminal 29
* RF Sensor circuit terminal 6
* LR Sensor circuit terminal 5
* RR Sensor circuit terminal 2


• If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, test or replace the wheel speed sensor.

6. If all circuits test normal, replace the EBCM.



Component Testing

1. Ignition OFF, disconnect the harness connector at the wheel speed sensor.
2. Connect a test lamp between B+ and the wheel speed sensor signal circuit terminal B.
3. Test for 4-8 mA on the low reading between the low reference terminal A and ground when spinning the wheel very slow.

• If not within the specified range, replace the wheel speed sensor.

4. Test for 12-16 mA on the high reading between the low reference terminal A and ground when spinning the wheel very slow.

• If not within the specified range, replace the wheel speed sensor.




Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Front Wheel Bearing and Hub Replacement (AWD) (Front Suspension)Front Wheel Bearing and Hub Replacement (RWD) (Front Suspension)
* Rear Wheel Bearing and Hub Replacement (Rear Suspension)
* Control Module References (Programming and Relearning) for EBCM replacement, setup, and programming