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C1206 ABS Inlet Valve Coil Rear Circuit Failure

The OBD2 code C1206 indicates a failure in the rear inlet valve coil circuit of the ABS (Anti-lock Braking System), which may affect the operation of the ABS system

Definition

The OBD2 code C1206 indicates a failure in the rear inlet valve coil circuit of the ABS (Anti-lock Braking System), which may affect the operation of the ABS system

Common causes

  • Faulty ABS inlet valve coil
  • Damaged wiring or connectors
  • Short circuit in the rear circuit
  • Open circuit in the rear circuit
  • Corrosion or poor connections
  • Failed ABS control module
  • Low battery voltage or poor power supply
  • Faulty wheel speed sensor
  • Grounding issues in the ABS system

Common misdiagnoses

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

    Visual Inspection: Check the ABS module, wiring harness, and connectors for any visible damage, corrosion, or loose connections

  3. 3. Wiring

    Look for frayed wires, broken connectors, or any signs of wear that could affect the circuit

  4. 4. Test the ABS 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. Power and Ground

    Check for proper voltage and ground at the inlet valve coil connector when the ABS system is activated

  6. 6. Inspect the ABS Module

    If the wiring and valve coil are in good condition, the ABS control module may be at fault. Check for any signs of damage or malfunction

  7. 7. Reprogram or Reset

    Sometimes, reprogramming or resetting the ABS module can resolve issues

  8. 8. Check for Short Circuits

    Inspect the wiring for any shorts to ground or power. A short circuit can cause the inlet valve coil to fail

  9. 9. Test the Brake Fluid Level and Condition

    Ensure that the brake fluid is at the correct level and is in good condition. Contaminated or low brake fluid can affect ABS operation

  10. 10. Perform a System Scan

    Use a scan tool to perform an ABS system scan. This can help identify any specific issues or malfunctions within the ABS system

  11. 11. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the ABS system for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  12. 12. Seek Professional Help

    If the issue persists after performing these steps, it may be best to consult a professional mechanic or an automotive technician with experience in ABS systems

  13. 13. Clear Codes and Test Drive

    After making repairs, clear the codes and take the vehicle for a test drive to see if the code returns. Monitor the ABS system's performance during the drive. By following these steps, you should be able to diagnose and potentially resolve the C1206 ABS Inlet Valve Coil Rear Circuit Failure code. Always refer to the vehicle's service manual for specific procedures and specifications