WOMS
C code chassis High severity

C1252 ABS Inlet Valve Coil LR Circuit Short To Battery

The OBD2 code C1252 indicates a short circuit in the left rear (LR) ABS inlet valve coil circuit, meaning the circuit is receiving power directly from the battery instead of functioning normally

Definition

The OBD2 code C1252 indicates a short circuit in the left rear (LR) ABS inlet valve coil circuit, meaning the circuit is receiving power directly from the battery instead of functioning normally

Common causes

  • Shorted wiring or connectors in the inlet valve coil circuit
  • Faulty inlet valve coil
  • Damaged ABS control module
  • Corroded or loose electrical connections
  • Grounding issues in the circuit

Common misdiagnoses

  • Faulty ABS module
  • Damaged wiring or connectors
  • Faulty wheel speed sensor
  • Incorrectly installed or defective brake components
  • Low brake fluid level
  • Faulty brake pedal position sensor
  • Malfunctioning hydraulic control unit (HCU)

Troubleshooting steps

  1. 1. Visual Inspection

    Wiring and Connectors: Inspect the wiring harness and connectors associated with the left rear ABS inlet valve coil. Look for signs of damage, fraying, corrosion, or loose connections

  2. 2. ABS Module

    Check the ABS module for any visible damage or corrosion

  3. 3. Check for Short Circuits

    Continuity Test: Use a multimeter to check for continuity in the wiring from the ABS module to the inlet valve coil. Look for any shorts to battery voltage

  4. 4. Grounding Issues

    Ensure that the ground connections are secure and free of corrosion

  5. 5. Test the Inlet Valve Coil

    Resistance Check: Measure the resistance of the inlet valve coil using a multimeter. Compare the reading to the manufacturer's specifications. A reading that is too low may indicate a short circuit

  6. 6. Functionality Test

    If possible, test the inlet valve coil by applying the appropriate voltage to see if it operates correctly

  7. 7. Check the ABS Module

    Diagnostic Scan: Use an OBD-II scanner to check for any additional codes that may provide more context to the issue

  8. 8. Module Functionality

    If other components are functioning normally, the ABS module itself may be faulty. Consider testing or replacing the module if necessary

  9. 9. Inspect Related Components

    Brake System Components: Check other components of the brake system, such as the brake lines and calipers, for any issues that could affect the ABS operation

  10. 10. Fuses and Relays

    Inspect the fuses and relays associated with the ABS system to ensure they are functioning properly

  11. 11. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using an OBD-II scanner

  12. 12. Take the vehicle for a test drive to see if the code reappears. Monitor the ABS system's performance during the drive

  13. 13. 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 provide additional guidance

  14. 14. Professional Assistance

    If the issue persists after performing these steps, consider seeking help from a professional mechanic or an automotive technician with experience in ABS systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the C1252 code. Always refer to the vehicle's service manual for specific procedures and specifications