WOMS
C code chassis Medium severity

C1156 Speed Wheel Sensor LF Circuit Open

The OBD2 code C1156 indicates that there is an open circuit in the left front speed wheel sensor, which means the vehicle's system is not receiving a signal from that sensor

Definition

The OBD2 code C1156 indicates that there is an open circuit in the left front speed wheel sensor, which means the vehicle's system is not receiving a signal from that sensor

Common causes

  • Faulty speed wheel sensor
  • Damaged wiring or connectors
  • Poor electrical connections
  • Corroded terminals
  • Broken or damaged sensor mounting
  • Faulty ABS control module
  • Issues with the vehicle's ground connections

Common misdiagnoses

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

Troubleshooting steps

  1. 1. Visual Inspection

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

  2. 2. Sensor Condition

    Inspect 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 reading to the manufacturer's specifications. If the resistance is out of range, the sensor may be faulty and need replacement

  4. 4. Check for Voltage

    Power Supply: With the ignition on (engine off), check for voltage at the sensor connector. There should be a reference voltage (usually around 5V) present. If there is no voltage, trace the wiring back to the ABS module or power source

  5. 5. Inspect the ABS Module

    Connections: Ensure that the ABS module connections are secure and free of corrosion

  6. 6. Module Functionality

    If other sensors are functioning correctly, the ABS module may be at fault. Consider testing or replacing the module if necessary

  7. 7. Check for Ground

    Ground Connection: Ensure that the ground connection for the wheel speed sensor is intact. A poor ground can cause an open circuit

  8. 8. Scan for Additional Codes

    Other Codes: Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues

  9. 9. Test Drive

    Monitor Data: After performing repairs or replacements, take the vehicle for a test drive while monitoring the wheel speed sensor data with a scan tool to ensure it is functioning correctly

  10. 10. Clear Codes and Retest

    Reset the System: After repairs, clear the trouble codes and see if the C1156 code returns after a test drive

  11. 11. Consult Repair Manual

    Manufacturer Specifications: Refer to the vehicle's service manual for specific diagnostic procedures, wiring diagrams, and specifications related to the wheel speed sensor circuit

  12. 12. Professional Help

    Seek Assistance: If the issue persists after following these steps, consider seeking help from a professional mechanic or technician who has experience with ABS and wheel speed sensor systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the C1156 code