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C0268 Pump Motor Circuit Open/Shorted

The OBD2 code C0268 indicates a malfunction in the pump motor circuit, specifically that there is an open or shorted condition affecting the pump motor's operation

Definition

The OBD2 code C0268 indicates a malfunction in the pump motor circuit, specifically that there is an open or shorted condition affecting the pump motor's operation

Common causes

  • Faulty pump motor
  • Open or shorted wiring
  • Bad connectors or terminals
  • Failed relay
  • Blown fuse
  • Corroded connections
  • Faulty control module

Common misdiagnoses

  • Faulty ABS control module
  • Bad wheel speed sensors
  • Damaged wiring or connectors
  • Defective brake pump motor
  • Low brake fluid level
  • Faulty relay or fuse
  • Incorrectly installed or malfunctioning brake system components

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 other issues present

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the pump motor circuit. Look for signs of damage, such as frayed wires, corrosion, or loose connections

  3. 3. Pay special attention to the connectors for the pump motor and any related components

  4. 4. Test the Pump Motor

    If accessible, test the pump motor itself for functionality. You can do this by applying direct power to the motor to see if it operates

  5. 5. If the motor does not run when powered directly, it may need to be replaced

  6. 6. Check for Ground Issues

    Ensure that the pump motor has a good ground connection. Use a multimeter to check for continuity between the ground wire and the vehicle's chassis

  7. 7. Repair any poor ground connections as needed

  8. 8. Inspect the Relay and Fuses

    Check the relay that controls the pump motor. Test the relay for proper operation and replace it if it is faulty

  9. 9. Inspect the fuses related to the ABS or pump motor circuit. Replace any blown fuses

  10. 10. Test Circuit Continuity

    Use a multimeter to check for continuity in the wiring harness between the pump motor and the control module. Look for any breaks or shorts in the wiring

  11. 11. If you find an open circuit, trace the wiring to locate the break and repair it

  12. 12. Check the Control Module

    If all other components check out, the issue may lie within the ABS control module. Check for any software updates or known issues with the module

  13. 13. In some cases, the control module may need to be reprogrammed or replaced

  14. 14. Clear Codes and Test Drive

    After performing repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  15. 15. Seek Professional Help

    If you are unable to diagnose or resolve the issue, consider seeking help from a professional mechanic or an automotive technician with experience in ABS systems. By following these steps, you should be able to identify and resolve the issue related to the C0268 code. Always ensure safety precautions are taken when working on vehicle electrical systems