WOMS
B code body Medium severity

B2455 Aux Heater Blower Faulted

The OBD2 code B2455 indicates a fault in the auxiliary heater blower system, suggesting that the blower motor is not functioning properly or there is an issue with its control circuit

Definition

The OBD2 code B2455 indicates a fault in the auxiliary heater blower system, suggesting that the blower motor is not functioning properly or there is an issue with its control circuit

Common causes

  • Faulty auxiliary heater blower motor
  • Blower motor resistor failure
  • Wiring issues or damaged connectors
  • Blown fuse
  • Faulty control module
  • Poor ground connection
  • Blocked or restricted airflow
  • Malfunctioning temperature sensor

Common misdiagnoses

  • Faulty blower motor
  • Blower motor resistor issues
  • Wiring harness problems
  • HVAC control module failure
  • Faulty temperature sensors
  • Incorrectly diagnosed HVAC system leaks
  • Battery or charging system issues
  • Faulty relays or fuses

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue

  2. 2. Inspect the Auxiliary Heater Blower

  3. 3. Visual Inspection

    Check the auxiliary heater blower motor for any visible damage, debris, or obstructions that could prevent it from operating

  4. 4. Electrical Connections

    Inspect the wiring and connectors leading to the blower motor for signs of corrosion, loose connections, or damage

  5. 5. Test the Blower Motor

  6. 6. Direct Power Test

    If safe to do so, apply direct power to the blower motor to see if it operates. If it does not run, the motor may be faulty and need replacement

  7. 7. Resistance Check

    Use a multimeter to check the resistance of the blower motor. If the resistance is outside the manufacturer's specifications, the motor may be defective

  8. 8. Check the Control Module

    The auxiliary heater blower is often controlled by a module. Inspect the control module for any signs of damage or failure. If necessary, test the module according to the manufacturer's specifications

  9. 9. Inspect Fuses and Relays

    Check the fuses and relays associated with the auxiliary heater system. A blown fuse or faulty relay can prevent the blower from operating

  10. 10. Wiring Inspection

    Trace the wiring from the blower motor to the control module and check for any breaks, shorts, or frayed wires that could cause a fault

  11. 11. Check for Ground Issues

    Ensure that the blower motor has a good ground connection. A poor ground can lead to operational issues

  12. 12. Review Technical Service Bulletins (TSBs)

    Check for any TSBs related to the auxiliary heater blower for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  13. 13. Reset the Code

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

  14. 14. Consult a Professional

    If you are unable to diagnose or resolve the issue, it may be best to consult a professional mechanic or technician who has experience with your vehicle's heating system. By following these steps, you should be able to identify the cause of the B2455 code and take appropriate action to resolve the issue