WOMS
C code chassis High severity

C1202 ABS Outlet Valve Coil Rear Circuit Failure

The OBD2 code C1202 indicates a failure in the rear outlet valve coil circuit of the ABS (Anti-lock Braking System), suggesting a malfunction in the electrical circuit or the valve itself

Definition

The OBD2 code C1202 indicates a failure in the rear outlet valve coil circuit of the ABS (Anti-lock Braking System), suggesting a malfunction in the electrical circuit or the valve itself

Common causes

  • Faulty ABS outlet valve coil
  • Damaged wiring or connectors
  • Short circuit in the ABS circuit
  • Open circuit in the ABS circuit
  • Corrosion or poor connections
  • Failed ABS control module
  • Low brake fluid level
  • Faulty wheel speed sensors

Common misdiagnoses

  • Faulty ABS module
  • Bad wheel speed sensors
  • Damaged wiring or connectors
  • Failed brake booster
  • Low brake fluid level
  • Faulty brake pedal position sensor
  • Malfunctioning traction control system
  • Incorrectly installed or defective brake pads or rotors

Troubleshooting steps

  1. 1. Check the Vehicle's Battery and Charging System

    Ensure the battery is fully charged and in good condition

  2. 2. Check the alternator output to ensure it is providing adequate voltage

  3. 3. Inspect ABS Fuse and Relays

    Locate the ABS fuse in the fuse box and check for continuity. Replace if blown

  4. 4. Check the ABS relay for proper operation

  5. 5. Visual Inspection of Wiring and Connectors

    Inspect the wiring harness and connectors related to the ABS system, particularly those leading to the rear outlet valve coil

  6. 6. Look for signs of damage, corrosion, or loose connections

  7. 7. Test the ABS Outlet Valve Coil

    Use a multimeter to measure the resistance of the outlet valve coil. Compare the reading to the manufacturer’s specifications

  8. 8. If the resistance is out of spec, the coil may be faulty and require replacement

  9. 9. Check for Short Circuits or Open Circuits

    Use a multimeter to check for continuity in the wiring to the outlet valve coil

  10. 10. Look for any short circuits to ground or open circuits that could be causing the failure

  11. 11. Scan for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes that may provide more context to the issue

  12. 12. Address any additional codes before focusing solely on C1202

  13. 13. Inspect the ABS Module

    If all other components check out, the ABS control module may be at fault

  14. 14. Check for any software updates or recalls related to the ABS module

  15. 15. Perform a System Reset

    After addressing any issues found, clear the trouble codes using an OBD-II scanner

  16. 16. Test drive the vehicle to see if the code returns

  17. 17. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the ABS system for your specific vehicle make and model, as there may be known issues or fixes

  18. 18. 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.Conclusion Always refer to the vehicle’s service manual for specific diagnostic procedures and specifications. Safety is paramount, so ensure the vehicle is properly secured and that you take necessary precautions when working on the braking system