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C0235 Rear Wheel Speed Signal Circuit Open

The OBD2 code C0235 indicates that there is an open circuit in the rear wheel speed signal, meaning the vehicle's system is not receiving a proper signal from the rear wheel speed sensor

Definition

The OBD2 code C0235 indicates that there is an open circuit in the rear wheel speed signal, meaning the vehicle's system is not receiving a proper signal from the rear wheel speed sensor

Common causes

  • Damaged or corroded wiring
  • Faulty wheel speed sensor
  • Poor electrical connections
  • Open circuit in the wiring harness
  • Faulty ABS control module
  • Wheel speed sensor reluctor ring damage

Common misdiagnoses

  • ABS Module Failure
  • Wheel Speed Sensor Failure
  • Wiring Issues
  • Connector Problems
  • Brake System Issues
  • Faulty ECU
  • Tire Size Mismatch
  • Brake Rotor Issues
  • Hub Assembly Problems
  • Incorrectly Installed Sensors

Troubleshooting steps

  1. 1. Check the OBD-II Code:

    Use an OBD-II scanner to confirm the C0235 code and check for any additional codes that may provide more context

  2. 2. Visual Inspection:

    Inspect the wiring and connectors associated with the rear wheel speed sensor. Look for signs of damage, corrosion, or loose connections

  3. 3. Check the condition of the wheel speed sensor itself

  4. 4. Test the Wheel Speed Sensor:

    Disconnect the wheel speed sensor connector and test the sensor with a multimeter. Measure the resistance of the sensor; it should typically fall within the manufacturer's specified range

  5. 5. If the sensor is faulty, replace it

  6. 6. Check the Wiring:

    Use a multimeter to check for continuity in the wiring between the wheel speed sensor and the ABS module. Look for any breaks or shorts in the wiring

  7. 7. Inspect for any pinched or frayed wires that could cause an open circuit

  8. 8. Check the ABS Module:

    If the sensor and wiring are in good condition, the issue may lie with the ABS module itself. Check for any fault codes related to the ABS module

  9. 9. If necessary, test the ABS module for proper operation or consider reprogramming or replacing it

  10. 10. Inspect the Ground Connections:

    Ensure that all ground connections related to the ABS system are clean and secure. A poor ground can lead to erratic sensor readings

  11. 11. Check for Interference:

    Look for any sources of electromagnetic interference that could affect the wheel speed sensor signal

  12. 12. Clear the Codes:

    After performing repairs, clear the OBD-II codes and take the vehicle for a test drive to see if the code returns

  13. 13. Consult Repair Manual:

    Refer to the vehicle's service manual for specific diagnostic procedures and specifications related to the rear wheel speed sensor and ABS system

  14. 14. Seek Professional Help:

    If the issue persists after performing these steps, consider seeking assistance from a qualified mechanic or technician who has experience with ABS systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the C0235 code