WOMS
C code chassis High severity

C1155 Speed Wheel Sensor LF Input Circuit Failure

The OBD2 code C1155 indicates a failure in the input circuit of the left front speed wheel sensor, which may affect the vehicle's anti-lock braking system (ABS) and traction control

Definition

The OBD2 code C1155 indicates a failure in the input circuit of the left front speed wheel sensor, which may affect the vehicle's anti-lock braking system (ABS) and traction control

Common causes

  • Faulty speed wheel sensor
  • Damaged wiring or connectors
  • Poor electrical connections
  • Corroded terminals
  • Sensor misalignment
  • Wheel bearing issues
  • ABS module failure
  • Faulty vehicle speed sensor
  • Interference from other components

Common misdiagnoses

  • Faulty wheel speed sensor
  • Damaged wiring or connectors
  • ABS control module failure
  • Brake system issues
  • Incorrect tire size or pressure
  • Faulty brake caliper or rotor
  • Issues with the vehicle's computer or software
  • Problems with the traction control system

Troubleshooting steps

  1. 1. Visual Inspection

    Check Wiring and Connectors: Inspect the wiring harness and connectors leading to the left front wheel speed sensor for any signs of damage, corrosion, or loose connections

  2. 2. Sensor Condition

    Examine the wheel speed sensor itself for physical damage or debris that may be obstructing it

  3. 3. Check Sensor Resistance

    Multimeter Test: Use a multimeter to measure the resistance of the wheel speed sensor. Compare the readings to the manufacturer's specifications. A significantly out-of-spec reading may indicate a faulty sensor

  4. 4. Check Voltage Supply

    Power and Ground: With the ignition on (engine off), check for the proper voltage supply to the wheel speed sensor. Ensure that the sensor is receiving the correct voltage and that the ground connection is solid

  5. 5. Test the Sensor Output

    Signal Testing: While the vehicle is in motion, use a multimeter or oscilloscope to check the output signal from the wheel speed sensor. The signal should vary as the wheel turns. If there is no signal or an erratic signal, the sensor may be faulty

  6. 6. Inspect the ABS Module

    Module Functionality: If the sensor and wiring appear to be in good condition, the issue may lie within the ABS module itself. Check for any fault codes related to the ABS system and consider testing or replacing the module if necessary

  7. 7. Check for Other Codes

    Scan for Additional Codes: Use an OBD-II scanner to check for any other related trouble codes that may provide additional context or indicate a broader issue within the ABS system

  8. 8. Clear Codes and Test Drive

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

  9. 9. Professional Diagnosis

    Seek Help if Needed: If the issue persists after performing the above steps, consider seeking assistance from a professional mechanic or technician who has experience with ABS systems and OBD-II diagnostics. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the C1155 code