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C1242 ABS Outlet Valve Coil LR Circuit Failure

The OBD2 code C1242 indicates a failure in the left rear (LR) outlet valve coil circuit of the ABS (Anti-lock Braking System), which may affect the operation of the ABS system

Definition

The OBD2 code C1242 indicates a failure in the left rear (LR) outlet valve coil circuit of the ABS (Anti-lock Braking System), which may affect the operation of the ABS system

Common causes

  • Faulty ABS outlet valve coil
  • Damaged wiring or connectors in the circuit
  • Short circuit in the ABS outlet valve circuit
  • Open circuit in the ABS outlet valve circuit
  • Corrosion or poor connections at the valve or connector
  • Failed ABS control module
  • Low brake fluid level
  • Faulty wheel speed sensor
  • Issues with the brake system or hydraulic components

Common misdiagnoses

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

Troubleshooting steps

  1. 1. Check the ABS Fuse:

    Inspect the ABS fuse in the fuse box. If the fuse is blown, replace it and see if the code returns

  2. 2. Visual Inspection:

    Inspect the wiring and connectors related to the left rear ABS outlet valve coil. Look for any signs of damage, corrosion, or loose connections

  3. 3. Test the Valve Coil:

    Use a multimeter to check the resistance of the left rear outlet valve coil. Compare the reading to the specifications in the vehicle's service manual. If the resistance is out of range, the coil may be faulty and require replacement

  4. 4. Check for Short Circuits:

    Inspect the wiring for any shorts to ground or to other circuits. A short can cause the coil to malfunction

  5. 5. Test the ABS Module:

    If the wiring and valve coil are in good condition, the issue may lie within the ABS control module. Use a scan tool to check for any additional codes that may indicate a problem with the module

  6. 6. Perform a System Reset:

    After addressing any issues found, clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive to see if the code returns

  7. 7. Check for Other Related Codes:

    Sometimes, other codes may be present that can provide additional context for the issue. Address any other codes that may be related to the ABS system

  8. 8. 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 apply

  9. 9. Professional Diagnosis:

    If the problem persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with ABS systems. They may have specialized tools and knowledge to diagnose the issue more effectively

  10. 10. Replace Faulty Components:

    If any faulty components are identified (such as the valve coil or ABS module), replace them as necessary.Safety Note: Always ensure that you take proper safety precautions when working on a vehicle's braking system. If you are not comfortable performing these steps, it is advisable to seek professional assistance