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C1208 ABS Inlet Valve Coil Rear Circuit Short To Battery

The OBD2 code C1208 indicates a short circuit in the rear ABS inlet valve coil circuit, which means there is an electrical fault causing the coil to receive constant power, potentially affecting the ABS system's...

Definition

The OBD2 code C1208 indicates a short circuit in the rear ABS inlet valve coil circuit, which means there is an electrical fault causing the coil to receive constant power, potentially affecting the ABS system's operation

Common causes

  • Damaged wiring or connectors
  • Short circuit in the inlet valve coil
  • Faulty ABS control module
  • Corroded terminals
  • Water intrusion in the ABS module or connectors
  • Failed inlet valve coil

Common misdiagnoses

  • Faulty ABS module
  • Damaged wiring or connectors
  • Faulty wheel speed sensors
  • Incorrectly installed or defective brake components
  • Shorted or open circuits in the ABS system
  • Faulty brake pedal position sensor
  • Malfunctioning powertrain control module (PCM)

Troubleshooting steps

  1. 1. Check the Code and Freeze Frame Data

    Use an OBD-II scanner to confirm the C1208 code is present

  2. 2. Review freeze frame data to understand the conditions under which the code was set

  3. 3. Visual Inspection

    Inspect the wiring and connectors related to the ABS inlet valve coil for any signs of damage, corrosion, or loose connections

  4. 4. Look for frayed wires, shorts, or any signs of wear that could cause a short circuit

  5. 5. Check the ABS Module

    Ensure that the ABS control module is functioning properly. A malfunctioning module can sometimes trigger false codes

  6. 6. Check for any additional codes that may indicate a broader issue with the ABS system

  7. 7. Test the Inlet Valve Coil

    Disconnect the inlet valve coil connector and use a multimeter to check the resistance of the coil. Compare the reading to the manufacturer’s specifications

  8. 8. If the resistance is too low (indicating a short) or too high (indicating an open circuit), the coil may need to be replaced

  9. 9. Inspect the Ground Connections

    Ensure that all ground connections related to the ABS system are clean and secure. Poor grounding can lead to erratic behavior and false codes

  10. 10. Check for Shorts to Power

    With the inlet valve coil disconnected, use a multimeter to check for continuity between the coil terminals and the battery positive terminal. A reading indicates a short circuit

  11. 11. Inspect the wiring harness for any points where the insulation may be damaged, allowing the wire to contact the chassis or other components

  12. 12. Test the ABS Relay and Fuses

    Check the ABS relay and associated fuses for proper operation. A faulty relay can cause issues in the circuit

  13. 13. Replace any blown fuses and test the relay for proper function

  14. 14. Clear the Code and Test Drive

    After performing repairs or replacements, clear the code using the OBD-II scanner

  15. 15. Take the vehicle for a test drive to see if the code reappears. Monitor the ABS system for proper operation

  16. 16. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the ABS system for your specific vehicle make and model. There may be known issues or recalls that could be relevant

  17. 17. Seek Professional Help

    If the issue persists after following these steps, it may be necessary to consult a professional mechanic or an automotive technician with experience in ABS systems for further diagnosis. By following these steps, you should be able to identify the cause of the C1208 code and take appropriate action to resolve the issue