WOMS
P code powertrain Medium severity

P023A Charge Air Cooler Coolant Pump Control Circuit Open

The OBD2 code P023A indicates that there is an open circuit in the control circuit for the charge air cooler coolant pump, which may prevent the pump from operating properly

Definition

The OBD2 code P023A indicates that there is an open circuit in the control circuit for the charge air cooler coolant pump, which may prevent the pump from operating properly

Common causes

  • Faulty charge air cooler coolant pump
  • Open or shorted wiring in the coolant pump circuit
  • Bad connector or corroded terminals
  • Failed coolant pump relay
  • Blown fuse in the coolant pump circuit
  • Faulty engine control module (ECM)

Common misdiagnoses

  • Faulty charge air cooler
  • Bad coolant pump
  • Wiring issues or shorts
  • Faulty engine control module (ECM)
  • Incorrect coolant levels
  • Blocked coolant passages
  • Faulty temperature sensors
  • Air leaks in the intake system

Troubleshooting steps

  1. 1. Check the Code

    Use an OBD-II scanner to confirm the P023A code and check for any additional codes that may provide more context about the issue

  2. 2. Visual Inspection

  3. 3. Inspect the wiring and connectors associated with the charge air cooler coolant pump. Look for any signs of damage, corrosion, or loose connections

  4. 4. Check the fuse related to the coolant pump circuit to ensure it is not blown

  5. 5. Test the Coolant Pump

  6. 6. If accessible, test the charge air cooler coolant pump for proper operation. You can do this by applying direct power to the pump to see if it runs

  7. 7. If the pump does not operate when powered directly, it may need to be replaced

  8. 8. Check the Control Circuit

  9. 9. Use a multimeter to test the voltage and ground at the pump connector. Ensure that the pump is receiving the correct voltage when the engine is running or when the pump is supposed to be activated

  10. 10. Check for continuity in the wiring between the engine control module (ECM) and the pump. Look for any breaks or shorts in the wiring

  11. 11. Inspect the Engine Control Module (ECM)

  12. 12. If the wiring and pump are functioning correctly, the issue may lie with the ECM. Check for any software updates or reprogramming that may be needed

  13. 13. Ensure that the ECM is properly grounded and that there are no issues with its connectors

  14. 14. Check for Other Related Issues

  15. 15. Look for any other related issues that could affect the coolant pump operation, such as problems with the cooling system, other sensors, or components that may influence the pump's operation

  16. 16. Clear the Code and Test Drive

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

  18. 18. Consult Repair Manual

    If the issue persists, consult the vehicle's repair manual for specific diagnostic procedures related to the charge air cooler coolant pump and its control circuit

  19. 19. Seek Professional Help

    If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these steps, you should be able to identify and resolve the issue related to the P023A code