WOMS
P code powertrain Medium severity

P1136 Fan Control Circuit Malfunction

The OBD2 code P1136 indicates a malfunction in the fan control circuit, which may affect the operation of the engine cooling fan

Definition

The OBD2 code P1136 indicates a malfunction in the fan control circuit, which may affect the operation of the engine cooling fan

Common causes

  • Faulty fan relay
  • Defective cooling fan
  • Wiring issues (shorts or open circuits)
  • Bad fan control module
  • Faulty engine control module (ECM)
  • Poor ground connections
  • Corroded connectors or terminals
  • Blown fuses

Common misdiagnoses

  • Faulty engine coolant temperature sensor
  • Malfunctioning thermostat
  • Defective fan relay
  • Wiring issues or shorts in the fan control circuit
  • Faulty engine control module (ECM)
  • Incorrectly installed or damaged fan motor
  • Air conditioning system issues
  • Problems with the radiator or cooling system
  • Faulty temperature gauge or sensor
  • Issues with the vehicle's electrical system

Troubleshooting steps

  1. 1. Check the Code

    Use an OBD-II scanner to confirm the P1136 code and check for any additional codes that may provide more context about the issue

  2. 2. Inspect the Wiring and Connectors

  3. 3. Visually inspect the wiring and connectors related to the cooling fan and the fan control circuit. Look for signs of damage, corrosion, or loose connections

  4. 4. Ensure that all connectors are securely attached and free of dirt or moisture

  5. 5. Test the Cooling Fan

  6. 6. Manually activate the cooling fan to see if it operates correctly. This can often be done by applying direct power to the fan motor

  7. 7. If the fan does not operate, it may need to be replaced

  8. 8. Check the Fan Relay

  9. 9. Locate the fan relay and test it for proper operation. You can swap it with a similar relay in the fuse box (if applicable) to see if the fan operates

  10. 10. If the relay is faulty, replace it

  11. 11. Inspect the Fan Control Module

  12. 12. If your vehicle has a fan control module, check it for proper operation. This may require specialized diagnostic equipment

  13. 13. Ensure that the module is receiving the correct signals from the engine control unit (ECU)

  14. 14. Test the Temperature Sensor

  15. 15. The engine coolant temperature sensor (ECT) provides input to the ECU regarding the engine temperature. If this sensor is faulty, it may cause incorrect fan operation

  16. 16. Test the ECT for proper resistance and operation

  17. 17. Check the Engine Control Unit (ECU)

  18. 18. If all other components are functioning correctly, the issue may lie within the ECU itself. Check for software updates or reprogramming if necessary

  19. 19. Inspect Fuses

  20. 20. Check the fuses related to the cooling fan circuit. A blown fuse can prevent the fan from operating

  21. 21. Clear the Codes

  22. 22. 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 reappears

  23. 23. Consult a Professional

  24. 24. If you are unable to diagnose or resolve the issue, it may be best to consult a professional mechanic 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 P1136 code. Always refer to your vehicle's service manual for specific diagnostic procedures and specifications