WOMS
P code powertrain Medium severity

P1433 A/C Refrigerant Temperature Circuit Low

The OBD2 code P1433 indicates that the A/C refrigerant temperature circuit is reading a low voltage or signal, suggesting a potential issue with the temperature sensor or its wiring

Definition

The OBD2 code P1433 indicates that the A/C refrigerant temperature circuit is reading a low voltage or signal, suggesting a potential issue with the temperature sensor or its wiring

Common causes

  • Faulty A/C refrigerant temperature sensor
  • Damaged wiring or connectors in the circuit
  • Short circuit in the A/C refrigerant temperature circuit
  • Open circuit in the A/C refrigerant temperature circuit
  • Faulty engine control module (ECM)
  • Low refrigerant levels
  • Poor ground connection

Common misdiagnoses

  • Faulty A/C compressor
  • Refrigerant leak
  • Blocked or restricted A/C system
  • Faulty A/C pressure switch
  • Wiring issues or shorts in the circuit
  • Faulty A/C control module
  • Incorrect refrigerant charge
  • Faulty temperature sensor

Troubleshooting steps

  1. 1. Check the A/C System

  2. 2. Ensure that the A/C system is properly charged with refrigerant. Low refrigerant levels can cause various issues, including incorrect temperature readings

  3. 3. Inspect Wiring and Connectors

  4. 4. Examine the wiring and connectors associated with the A/C refrigerant temperature sensor. Look for signs of damage, corrosion, or loose connections that could affect the signal

  5. 5. Test the A/C Refrigerant Temperature Sensor

  6. 6. Use a multimeter to test the resistance of the refrigerant temperature sensor. Compare the readings to the specifications provided in the vehicle's service manual. If the sensor is out of range, it may need to be replaced

  7. 7. Check for Short Circuits

  8. 8. Inspect the wiring harness for any short circuits or grounding issues that could cause the sensor to send a low signal

  9. 9. Scan for Additional Codes

  10. 10. Use an OBD-II scanner to check for any other related trouble codes that may provide more context for the issue. Addressing any additional codes may help resolve the P1433 code

  11. 11. Inspect the A/C Control Module

  12. 12. If the sensor and wiring are in good condition, the issue may lie with the A/C control module. Check for any software updates or known issues with the module

  13. 13. Clear the Code and Test Drive

  14. 14. After performing any repairs or replacements, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns

  15. 15. Consult the Service Manual

  16. 16. Refer to the vehicle's service manual for specific diagnostic procedures and specifications related to the A/C refrigerant temperature circuit

  17. 17. Professional Diagnosis

  18. 18. If the issue persists after performing the above steps, consider seeking help from a professional mechanic or automotive technician who has experience with A/C systems and OBD-II diagnostics. By following these steps, you should be able to identify and address the underlying issue causing the P1433 code