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C1175 Speed Wheel Sensor LR Input Circuit Failure

The OBD2 code C1175 indicates a failure in the input circuit of the left rear speed wheel sensor, which may affect the vehicle's traction control and anti-lock braking system

Definition

The OBD2 code C1175 indicates a failure in the input circuit of the left rear speed wheel sensor, which may affect the vehicle's traction control and anti-lock braking system

Common causes

  • Faulty speed wheel sensor
  • Damaged wiring or connectors
  • Corrosion at the sensor connector
  • Poor ground connection
  • Faulty ABS control module
  • Wheel bearing issues
  • Incorrect sensor installation or alignment
  • Interference from debris or dirt on the sensor

Common misdiagnoses

  • Faulty wheel speed sensor
  • Damaged wiring or connectors
  • ABS module failure
  • Brake system issues
  • Incorrect tire size or pressure
  • Faulty vehicle speed sensor
  • Issues with the anti-lock braking system (ABS) pump
  • Problems with the electronic control unit (ECU)

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are multiple issues

  2. 2. Visual Inspection

    Inspect the wiring and connectors associated with the left rear wheel speed sensor. Look for

  3. 3. Damaged or frayed wires

  4. 4. Corroded or loose connectors

  5. 5. Signs of moisture or dirt ingress

  6. 6. Sensor Condition

    Examine the wheel speed sensor itself for physical damage or contamination. Ensure that it is securely mounted and not obstructed by debris

  7. 7. Check Sensor Resistance

    Disconnect the wheel speed sensor connector and use a multimeter to measure the resistance of the sensor. Compare the reading to the manufacturer's specifications. A reading outside the specified range may indicate a faulty sensor

  8. 8. Check Voltage Supply

    With the sensor still disconnected, check the voltage supply at the connector while the ignition is on. Ensure that the correct voltage is present as per the vehicle's specifications

  9. 9. Test the Sensor

    If the sensor is accessible, you can perform a functional test. Reconnect the sensor and use a scan tool to monitor the wheel speed while the vehicle is in motion. The reading should change as the wheel turns

  10. 10. Inspect the ABS Module

    If the sensor and wiring are in good condition, the issue may lie within the ABS control module. Check for any signs of damage or malfunction

  11. 11. Check for Ground Issues

    Ensure that the ground connection for the wheel speed sensor is intact and free of corrosion. A poor ground can lead to erratic sensor readings

  12. 12. Clear Codes and Test Drive

    After performing repairs or replacements, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code reappears

  13. 13. Professional Diagnosis

    If you are unable to resolve the issue after these steps, consider seeking help from a professional mechanic or technician who has experience with ABS systems and OBD-II diagnostics. By following these steps, you should be able to identify and address the cause of the C1175 code effectively