C0047
DTC C0035-C0052
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 Descriptors
DTC C0035
- Left Front Wheel Speed Sensor Circuit
DTC C0036
- Left Front Wheel Speed Sensor Circuit Range Performance
DTC C0037
- Left Front Wheel Speed Sensor Circuit Low
DTC C0040
- Right Front Wheel Speed Sensor Circuit
DTC C0041
- Right Front Wheel Speed Sensor Circuit Range Performance
DTC C0042
- Right Front Wheel Speed Sensor Circuit Low
DTC C0045
- Left Rear Wheel Speed Sensor Circuit
DTC C0046
- Left Rear Wheel Speed Sensor Circuit Range Performance
DTC C0047
- Left Rear Wheel Speed Sensor Circuit Low
DTC C0050
- Right Rear Wheel Speed Sensor Circuit
DTC C0051
- Right Rear Wheel Speed Sensor Circuit Range Performance
DTC C0052
- Right Rear Wheel Speed Sensor Circuit Low
Diagnostic Fault Information
Circuit Description
As the wheel spins, the wheel speed sensor (WSS) produces an AC signal. The electronic brake control module (EBCM) uses the frequency of the AC signal to calculate the wheel speed.
Conditions for Running the DTC
C0035, C0040, C0045, or C0050
Ignition ON.
C0036, C0037, C0041, C0042, C0046, C0047, C0051, or C0052
* DTCs C0035, C0040, C0045, or C0050 are not set.
* The brake pedal is not pressed.
* The ABS is not active.
* At least two wheel speeds are not 0 km/h.
Conditions for Setting the DTC
C0035, C0040, C0045, or C0050
* A short to ground, or an open/high resistance is detected on the wheel speed sensor signal circuit.
* A short to B+, short to ground or an open/high resistance is detected on the low reference circuit.
C0036, C0041, C0046, or C0051
The EBCM detects 3 irratic readings from a wheel speed sensor.
C0037, C0042, C0047, or C0052
* The suspect wheel speed equals zero.
* The other wheel speeds are greater than 8 km/h (5 mph).
* The other wheel speeds are within 11 km/h (7 mph) of each other.
Action Taken When the DTC Sets
If equipped, the following actions occur:
* The EBCM disables the antilock brake system (ABS)/traction control system (TCS)/vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
* The EBCM disables the dynamic rear proportion (DRP).
* The ABS indicator illuminates.
* The Traction Control indicator illuminates.
* The driver information center (DIC) displays the Service Stability System message.
Conditions for Clearing the DTC
* The condition for the DTC is no longer present.
* The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Diagnostic Aids
C0035, C0037, C0040, C0042, C0045, C0047, C0050 or C0052
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 (9.9 ml) of salt to 354 ml (12 oz) 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. If the DTC returns, replace the suspected wheel speed sensor or repair the wheel speed sensor wiring.
4. Rinse the area thoroughly when completed.
C0036, C0041, C0046, or C0051
A possible cause of this DTC is electrical magnetic interference.
Reference Information
Schematic Reference
Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems
Connector End View Reference
Component Connector End 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 Control Module References for scan tool information
Circuit/System Verification
Observe the scan tool Wheel Speed Sensor parameter. The reading should be the same on all sensors when driving in a straight line at a speed greater than 20 km/h (13 mph).
Circuit/System Testing
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 signal circuit terminal of the appropriate sensor listed below and ground.
* LF Sensor circuit terminal 28
* RF Sensor circuit terminal 24
* LR Sensor circuit terminal 12
* RR Sensor circuit terminal 43
• If greater than the specified value, test the low reference circuit for a short to voltage. If the circuit tests normal, test or replace the wheel speed sensor.
3. Test for less than 1 volt between the voltage signal circuit terminal of the appropriate sensor listed below and ground.
* LF Sensor circuit terminal 27
* RF Sensor circuit terminal 39
* LR Sensor circuit terminal 13
* RR Sensor circuit terminal 42
• If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the wheel speed sensor.
4. Ignition OFF, test for infinite resistance between the low reference signal circuit terminal of the appropriate sensor listed below and ground.
* LF Sensor circuit terminal 28
* RF Sensor circuit terminal 24
* LR Sensor circuit terminal 12
* RR Sensor circuit terminal 43
• 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 voltage signal circuit terminal of the appropriate sensor listed below and ground.
* LF Sensor circuit terminal 27
* RF Sensor circuit terminal 39
* LR Sensor circuit terminal 13
* RR Sensor circuit terminal 42
• 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. Ignition OFF, disconnect the harness connector at the appropriate wheel speed sensor.
7. Test for less than 2 ohms between the appropriate low reference signal circuit terminals listed below.
* LF Sensor circuit terminal 28 at the EBCM harness connector and terminal B at the WSS harness connector.
* RF Sensor circuit terminal 24 at the EBCM harness connector and terminal B at the WSS harness connector.
* LR Sensor circuit terminal 12 at the EBCM harness connector and terminal B at the WSS harness connector.
* RR Sensor circuit terminal 43 at the EBCM harness connector and terminal B at the WSS harness connector.
• If greater than the specified value, test the low reference circuit for an open or high resistance. If the circuit tests normal, test or replace the wheel speed sensor.
8. Test for less than 2 ohms between the appropriate voltage signal circuit terminals listed below.
* LF Sensor circuit terminal 27 at the EBCM harness connector and terminal A at the WSS harness connector.
* RF Sensor circuit terminal 39 at the EBCM harness connector and terminal A at the WSS harness connector.
* LR Sensor circuit terminal 13 at the EBCM harness connector and terminal A at the WSS harness connector.
* RR Sensor circuit terminal 42 at the EBCM harness connector and terminal A at the WSS harness connector.
• If greater than the specified value, test the voltage signal circuit for an open or high resistance. If the circuit tests normal, test or replace the wheel speed sensor.
9. If all circuits test normal, replace the ECBM.
Component Testing
1. Test for 850-1350 ohms between the voltage signal terminal A and low reference signal terminal B of the appropriate wheel speed sensor.
• If not within the specified range, replace the wheel speed sensor.
2. Test for greater than 100 mV AC voltage between terminal A and terminal B of the wheel speed sensor, when spinning the wheel.
• If less than the specified range, replace the appropriate wheel speed sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Front Wheel Speed Sensor Replacement Front Wheel Speed Sensor Replacement
* Rear Wheel Speed Sensor Replacement Rear Wheel Speed Sensor Replacement
* Control Module References Control Module References for EBCM replacement, setup and programming