WOMS
B code body Medium severity

B1968 A/C Water Pump Detection Circuit Failure

The OBD2 code B1968 indicates a failure in the A/C water pump detection circuit, suggesting that the vehicle's system is unable to properly monitor or communicate with the A/C water pump

Definition

The OBD2 code B1968 indicates a failure in the A/C water pump detection circuit, suggesting that the vehicle's system is unable to properly monitor or communicate with the A/C water pump

Common causes

  • Faulty A/C water pump
  • Wiring issues (shorts, opens, or corrosion)
  • Bad connectors or terminals
  • Failed A/C control module
  • Blown fuse
  • Software issues in the vehicle's control module
  • Grounding problems

Common misdiagnoses

  • Faulty A/C compressor
  • Refrigerant leak
  • Electrical issues in the A/C system
  • Bad A/C control module
  • Wiring harness problems
  • Faulty temperature sensors
  • Incorrect A/C system pressure readings
  • Malfunctioning engine cooling system components

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 the A/C Water Pump

    Locate the A/C water pump and visually inspect it for any signs of damage or wear

  4. 4. Ensure that the pump is securely mounted and that there are no leaks

  5. 5. Test the A/C Water Pump Operation

    If possible, manually activate the A/C water pump to see if it operates correctly

  6. 6. Listen for unusual noises that may indicate a mechanical failure

  7. 7. Check Electrical Connections

    Inspect the wiring and connectors leading to the A/C water pump for any signs of corrosion, damage, or loose connections

  8. 8. Ensure that all connectors are securely attached

  9. 9. Test the A/C Water Pump Circuit

    Use a multimeter to check for voltage at the pump connector when the A/C is activated

  10. 10. Check for continuity in the wiring harness leading to the pump

  11. 11. Inspect Fuses and Relays

    Check the vehicle’s fuse box for any blown fuses related to the A/C system or water pump

  12. 12. Test any relays associated with the A/C water pump to ensure they are functioning properly

  13. 13. 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

  14. 14. Address any additional codes that may be present

  15. 15. Check the A/C Control Module

    If the pump and circuit appear to be functioning correctly, the issue may lie within the A/C control module

  16. 16. Inspect the module for any signs of damage or failure

  17. 17. Consult Technical Service Bulletins (TSBs)

    Check for any manufacturer-specific TSBs related to the B1968 code or A/C water pump issues for your vehicle make and model

  18. 18. Clear Codes and Test Drive

    After performing repairs or inspections, clear the trouble codes and take the vehicle for a test drive to see if the code returns.1

  19. 19. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1968 OBD-II code