WOMS
C code chassis Medium severity

C1255 ABS Inlet Valve Coil RR Circuit Open

The OBD2 code C1255 indicates that there is an open circuit in the right rear ABS inlet valve coil, which means the valve is not receiving the necessary electrical signal to operate properly

Definition

The OBD2 code C1255 indicates that there is an open circuit in the right rear ABS inlet valve coil, which means the valve is not receiving the necessary electrical signal to operate properly

Common causes

  • Open circuit in the inlet valve coil wiring
  • Damaged or corroded connectors
  • Faulty inlet valve coil
  • Blown fuse related to the ABS system
  • Faulty ABS control module
  • Poor ground connection in the ABS system

Common misdiagnoses

  • Faulty ABS module
  • Damaged wiring or connectors
  • Faulty wheel speed sensor
  • Brake fluid level issues
  • Faulty brake booster
  • Incorrectly installed or defective ABS pump
  • General electrical issues or shorts in the system

Troubleshooting steps

  1. 1. Visual Inspection

    Wiring and Connectors: Check the wiring harness and connectors leading to the ABS inlet valve coil for any signs of damage, corrosion, or loose connections

  2. 2. ABS Module

    Inspect the ABS module for any physical damage or signs of water intrusion

  3. 3. 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 other issues affecting the ABS system

  4. 4. Test the Inlet Valve Coil

    Resistance Check: Use a multimeter to measure the resistance of the inlet valve coil. Compare the reading to the manufacturer's specifications. If the resistance is out of range, the coil may be faulty

  5. 5. Continuity Test

    Check for continuity in the wiring from the ABS module to the inlet valve coil. An open circuit indicates a break in the wiring

  6. 6. Inspect the ABS Module

    If the wiring and coil are in good condition, the issue may lie within the ABS module itself. Check for any signs of failure or internal faults

  7. 7. If possible, perform a bench test on the ABS module or consider replacing it if it is determined to be faulty

  8. 8. Check Power and Ground

    Verify that the ABS inlet valve coil is receiving the correct voltage and ground. Use a multimeter to check for power at the connector while the ignition is on

  9. 9. If there is no power, trace the circuit back to the ABS module to identify any issues

  10. 10. Repair or Replace Components

    Based on the findings from the previous steps, repair any damaged wiring or connectors

  11. 11. If the inlet valve coil is faulty, replace it with a new one

  12. 12. If the ABS module is determined to be faulty, consider replacing it

  13. 13. Clear Codes and Test Drive

    After making repairs, clear the trouble codes using an OBD-II scanner

  14. 14. Perform a test drive to see if the code returns and to ensure that the ABS system is functioning correctly

  15. 15. Seek Professional Help

    If the issue persists after following these steps, it may be best to consult a professional mechanic or an automotive technician with experience in ABS systems for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the C1255 code