C0050
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 End Views By Name)
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
Ignition ON, driving in a straight line at a speed greater than 20 km/h (13 mph), observes the scan tool Wheel Speed Sensor parameters. The readings should be within 1 mph of each other.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate B5 wheel speed sensor.
2. Ignition ON, test for greater than 11 V between the signal circuit terminal B and ground.
• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K17 EBCM.
3. Install a 3 A fused jumper wire at the signal circuit terminal B. Verify the scan tool Wheel Speed Sensor parameter changes while rapidly tapping the fused jumper wire to the low reference circuit terminal A.
• If no change is observed, disconnect the harness connector at the K17 EBCM and test for the following conditions below. If all circuits test normal, replace the K17 EBCM.
* Signal circuit for short to voltage.
* Low reference circuit for a short to voltage, short to ground, or an open/high resistance.
4. If all circuits test normal, test or replace the B5 wheel speed sensor.
Component Testing
Note: The following wheel speed sensor test is polarity sensitive. The wheel speed sensor can be permanently damaged if the polarity is reversed during the test.
1. Ignition OFF, disconnect the harness connector at the appropriate B5 wheel speed sensor.
2. Connect a 3 A fused jumper wire between the signal terminal A and 12 V.
3. Connect a DMM set to read DC amperage between the low reference terminal B and ground.
4. Spin the wheel very slowly, test for a DC current switching between a low value of 4-8 mA and a high value of 11-16 mA.
• If not within the specified range, 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 (Front Wheel Speed Sensor Replacement)
* Rear Wheel Speed Sensor Replacement (Disc Brake) (Rear Wheel Speed Sensor Replacement (Disc Brake))Rear Wheel Speed Sensor Replacement (Drum Brake) (Rear Wheel Speed Sensor Replacement (Drum Brake))
* Control Module References (Programming and Relearning)for EBCM replacement, programming and setup