WOMS
C code chassis Medium severity

C1168 Speed Wheel Sensor RR Coherency Fault

The OBD2 code C1168 indicates a coherency fault with the right rear speed wheel sensor, suggesting a discrepancy in the speed readings between the right rear wheel sensor and other wheel sensors

Definition

The OBD2 code C1168 indicates a coherency fault with the right rear speed wheel sensor, suggesting a discrepancy in the speed readings between the right rear wheel sensor and other wheel sensors

Common causes

  • Faulty rear right wheel speed sensor
  • Damaged wiring or connectors to the wheel speed sensor
  • Poor electrical connections
  • Faulty ABS control module
  • Incorrectly installed or misaligned wheel speed sensor
  • Brake system issues affecting sensor operation
  • Wheel bearing problems affecting sensor readings
  • Software or calibration issues in the ABS system

Common misdiagnoses

  • Faulty wheel speed sensor
  • Damaged wiring or connectors
  • ABS control module failure
  • Brake system issues
  • Tire size discrepancies
  • Incorrectly installed or misaligned sensors
  • Faulty vehicle speed sensor
  • 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 Wheel Speed Sensor

    Visual Inspection: Check the rear right 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 wheel speed 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 readings to the manufacturer's specifications

  5. 5. Signal Test

    If possible, use an oscilloscope to check the signal output from the sensor while the vehicle is in motion. The signal should vary with wheel speed

  6. 6. Inspect Wiring and Connectors

    Check the wiring harness leading to the wheel speed sensor for any signs of wear, fraying, or damage. Repair or replace any damaged wiring

  7. 7. Ensure that all connectors are clean and securely connected

  8. 8. Check for Mechanical Issues

    Inspect the brake components and wheel assembly for any mechanical issues that could affect the wheel speed sensor, such as a stuck brake caliper or damaged wheel bearing

  9. 9. Check ABS Module

    If the sensor and wiring are in good condition, the issue may lie within the ABS control module. Check for any software updates or known issues with the module

  10. 10. Clear Codes and Test Drive

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

  11. 11. Professional Diagnosis

    If the issue persists after performing these steps, consider seeking help from 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 C1168 code