WOMS
C code chassis Medium severity

C1165 Speed Wheel Sensor RR Input Circuit Failure

The OBD2 code C1165 indicates a failure in the input circuit of the right rear speed wheel sensor, which may affect the vehicle's traction control and anti-lock braking system

Definition

The OBD2 code C1165 indicates a failure in the input circuit of the right 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
  • Corroded electrical connections
  • Faulty ABS control module
  • Improper sensor alignment
  • Wheel bearing issues
  • Brake system problems
  • Interference from other electronic components

Common misdiagnoses

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

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. Inspect the Wheel Speed Sensor

    Visual Inspection: Check the right rear wheel speed sensor for any visible damage, such as cracks, corrosion, or loose connections

  3. 3. Connector Check

    Ensure that the electrical connector to the sensor is secure and free of corrosion or dirt

  4. 4. Test the Wheel Speed Sensor

    Resistance Test: Use a multimeter to measure the resistance of the wheel speed sensor. Compare the reading to the manufacturer's specifications. A reading outside the specified range may indicate a faulty sensor

  5. 5. Signal Test

    If possible, use an oscilloscope to check the signal output from the sensor while the wheel is being turned. The signal should vary as the wheel rotates

  6. 6. Inspect Wiring and Connectors

    Check the wiring harness leading to the wheel speed sensor for any signs of damage, such as fraying, cuts, or shorts

  7. 7. Look for any loose or corroded connectors that could affect the signal

  8. 8. Check the ABS Module

    If the sensor and wiring appear to be in good condition, the issue may lie within the ABS control module. Check for any faults or issues with the module itself

  9. 9. Test the Vehicle Speed Sensor (VSS)

    If applicable, check the vehicle speed sensor, as it can sometimes affect the wheel speed sensor readings

  10. 10. Inspect the Brake Components

    Ensure that the brake components, such as the rotor and caliper, are not interfering with the wheel speed sensor. Sometimes, debris or misalignment can cause issues

  11. 11. Clear Codes and Test Drive

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

  12. 12. Consult Repair Manual

    If the issue persists, consult the vehicle's repair manual for specific diagnostic procedures and specifications related to the wheel speed sensor and ABS system

  13. 13. Seek Professional Help

    If you are unable to resolve the issue after these steps, it may be best to consult a professional 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 C1165 code