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C0040






DTC C0035, C0040, C0045, or C0050

Diagnostic Instructions

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

DTC Descriptor
DTC C0035 06
- Left Front Wheel Speed Sensor Circuit Low Voltage/Open

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

DTC C0035 18
- Left Front Wheel Speed Sensor Circuit Low Signal Amplitude

DTC C0035 5A
- Left Front Wheel Speed Sensor Circuit Not Plausible

DTC C0040 06
- Right Front Wheel Speed Sensor Circuit Low Voltage/Open

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

DTC C0040 18
- Right Front Wheel Speed Sensor Circuit Low Signal Amplitude

DTC C0040 5A
- Right Front Wheel Speed Sensor Circuit Not Plausible

DTC C0045 06
- Left Rear Wheel Speed Sensor Circuit Low Voltage/Open

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

DTC C0045 18
- Left Rear Wheel Speed Sensor Circuit Low Signal Amplitude

DTC C0045 5A
- Left Rear Wheel Speed Sensor Circuit Not Plausible

DTC C0050 06
- Right Rear Wheel Speed Sensor Circuit Low Voltage/Open

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

DTC C0050 18
- Right Rear Wheel Speed Sensor Circuit Low Signal Amplitude

DTC C0050 5A
- Right Rear Wheel Speed Sensor Circuit Not Plausible

Diagnostic Fault Information









Circuit/System Description

The wheel speeds are detected by active wheel speed sensors and encoder rings. The encoder ring consists of permanent magnets. Each wheel speed sensor receives 12 V reference voltages from the electronic brake control module (EBCM). The wheel speed sensor produces changing current between 7-14 mA on the EBCM signal circuit. As the wheel spins, the EBCM uses the frequency of the square wave signal to calculate the actual wheel speed.

Conditions for Running the DTC

C0035 06 - C0050 06

Ignition ON

C0035 0F - C0050 0F
* Ignition ON
* Vehicle speed is greater than 35 km/h (22 mph)

C0035 18 - C0050 18
* Ignition ON
* Vehicle speed is greater than 10 km/h (6 mph)

C0035 5A - C0050 5A
* Ignition ON
* Vehicle speed is greater than 20 km/h (13 mph)

Conditions for Setting the DTC

C0035 06 - C0050 06

A short to voltage, short to ground or open/high resistance on the wheel speed sensor 12 V reference or low reference circuit is detected for 0.14 second.

C0035 0F - C0050 0F

An erratic wheel speed sensor signal is detected for 0.17 second.

C0035 18 - C0050 18

A missing wheel speed sensor signal is detected for 180 seconds.

C0035 5A - C0050 5A

Difference between fastest and slowest wheel speed is greater than 50% for 30 seconds.

Action Taken When the DTC Sets

* The EBCM disables the ABS, traction control, and stability control for the duration of the ignition cycle.
* The ABS indicator turns ON.
* The traction control/stability control-active indicator turns ON.

Conditions for Clearing the DTC

* A current DTC clears when the diagnostic runs and passes.
* The EBCM will turn OFF the indicator in the next ignition cycle.

Diagnostic Aids

* Do not use a magnet to clean the encoder ring.
* If 2 or more wheel speed sensors are inoperative, diagnose each wheel speed sensor individually.

Reference Information
Schematic Reference

Antilock Brake System Schematics (Electrical Diagrams)
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 (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing For Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Test drive the vehicle in a straight line at a speed greater than 40 km/h (25 mph).
2. Verify all scan tool Wheel Speed Sensor parameters are within 4 km/h (2.5 mph) of each other.

--> If any parameter is not within 4 km/h (2.5 mph) of each other

Refer to Circuit/System Testing

• If each parameter is within 4 km/h (2.5 mph) of each other

3. All OK.

Circuit/System Testing

Note: If any of the symptom codes 0F, 18 or 5A are set, refer to the Diagnostic Fault Information table for possible mechanical faults or conditions.

1. Ignition OFF, disconnect the harness connector at the appropriate B5 wheel speed sensor, ignition ON.
2. Test for greater than 11 V between the ignition circuit terminal 1 and ground.

--> If less than 11 V

2.1. Ignition OFF, disconnect the harness connector at the K17 electronic brake control module.
2.2. Test for infinite resistance between the ignition circuit and ground.

--> If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance.

2.3. Test for less than 2 Ohms in the ignition circuit end to end.

--> If 2 Ohms or greater, repair the open/high resistance in the circuit.
--> If less than 2 Ohms, replace the K17 electronic brake control module.


• If 11 V or greater

3. Install a 3 A fused jumper wire at the ignition circuit terminal 1, ignition ON.
4. Verify the scan tool Wheel Speed Sensor parameter changes while rapidly tapping the fused jumper wire to the signal circuit terminal 2.

--> If the parameter does not change

4.1. Ignition OFF, disconnect the harness connector at the K17 electronic brake control module, ignition ON.
4.2. Test for less than 1 V between the signal circuit and ground.

--> If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V

4.3. Ignition OFF.
4.4. Test for infinite resistance between the signal circuit and ground.

--> If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance.

4.5. Test for less than 2 Ohms in the signal circuit end to end.

--> If 2 Ohms or greater, repair the open/high resistance in the circuit.

--> If less than 2 Ohms, replace the K17 electronic brake control module.

• If the parameter changes

5. Replace the B5 wheel speed sensor.

Repair Instructions

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

* Front Wheel Speed Sensor Replacement (With F45) (Front Wheel Speed Sensor Replacement (With F45))Front Wheel Speed Sensor Replacement (Without F45) (Front Wheel Speed Sensor Replacement (Without F45))
* Rear Wheel Speed Sensor Replacement (4-Link) (Rear Wheel Speed Sensor Replacement (4-Link))Rear Wheel Speed Sensor Replacement (H-Arm) (Rear Wheel Speed Sensor Replacement (H-Arm))
* Control Module References (Programming and Relearning) for EBCM replacement, setup and programming

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