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C1250 ABS Inlet Valve Coil LR Circuit Failure

The OBD2 code C1250 indicates a failure in the left rear (LR) inlet valve coil circuit of the ABS (Anti-lock Braking System), which may affect the operation of the ABS system

Definition

The OBD2 code C1250 indicates a failure in the left rear (LR) inlet valve coil circuit of the ABS (Anti-lock Braking System), which may affect the operation of the ABS system

Common causes

  • Faulty inlet valve coil
  • Damaged wiring or connectors
  • Short circuit in the circuit
  • Open circuit in the circuit
  • Corrosion or poor connections
  • Failed ABS control module
  • Electrical interference or noise
  • Low battery voltage or poor power supply

Common misdiagnoses

  • Faulty ABS module
  • Bad wheel speed sensor
  • Wiring issues or shorts in the circuit
  • Faulty brake pedal position sensor
  • Defective hydraulic control unit
  • Low brake fluid level
  • Incorrectly installed or damaged ABS pump
  • Faulty relay or fuse related to the ABS system

Troubleshooting steps

  1. 1. 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 multiple issues

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the left rear ABS inlet valve coil. Look for

  3. 3. Damaged, frayed, or corroded wires

  4. 4. Loose or corroded connectors

  5. 5. Signs of moisture or dirt ingress

  6. 6. Test the ABS Inlet Valve Coil

    Use a multimeter to test the resistance of the inlet valve coil. Compare the readings to the manufacturer's specifications. If the resistance is out of range, the coil may be faulty and require replacement

  7. 7. Check for Power and Ground

    With the ignition on, check for voltage at the inlet valve coil connector. Ensure that the coil is receiving the proper voltage

  8. 8. Also, check for a good ground connection. A poor ground can cause the coil to malfunction

  9. 9. Inspect the ABS Module

    If the wiring and coil are in good condition, the issue may lie within the ABS control module. Inspect the module for any signs of damage or corrosion

  10. 10. If possible, perform a diagnostic test on the ABS module to check for any internal faults

  11. 11. Check for Mechanical Issues

    Inspect the brake system components, including the brake lines and calipers, for any mechanical issues that could affect the operation of the ABS system

  12. 12. Clear Codes and Test Drive

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

  13. 13. Take the vehicle for a test drive to see if the code reappears. Monitor the ABS operation during the drive

  14. 14. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or an automotive technician with experience in ABS systems for further diagnosis.Safety Note Always ensure safety when working on the braking system. If you're not comfortable performing these checks, it's best to seek professional assistance