WOMS
B code body Medium severity

B2464 Aux Heater Start Time Exceeded

The OBD2 code B2464 indicates that the auxiliary heater's start time has exceeded the allowable limit, suggesting a potential issue with the heater's operation or control system

Definition

The OBD2 code B2464 indicates that the auxiliary heater's start time has exceeded the allowable limit, suggesting a potential issue with the heater's operation or control system

Common causes

  • Faulty auxiliary heater
  • Wiring issues or short circuits
  • Malfunctioning temperature sensors
  • Low coolant levels
  • Blocked or restricted coolant flow
  • Failed control module
  • Software issues or updates needed
  • Poor electrical connections or corrosion

Common misdiagnoses

  • Faulty auxiliary heater
  • Wiring issues or shorts
  • Bad temperature sensors
  • Control module malfunctions
  • Fuel delivery problems
  • Exhaust system blockages
  • Battery or charging system issues
  • Software glitches or updates needed

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect the Auxiliary Heater

    Visual Inspection: Check the auxiliary heater for any visible signs of damage, corrosion, or loose connections

  3. 3. Functionality Test

    If possible, test the operation of the auxiliary heater to ensure it is functioning correctly

  4. 4. Examine Electrical Connections

    Wiring and Connectors: Inspect all wiring and connectors related to the auxiliary heater for damage, corrosion, or loose connections

  5. 5. Ground Connections

    Ensure that all ground connections are secure and free of corrosion

  6. 6. Check Fuses and Relays

    Inspect the fuses and relays associated with the auxiliary heater system. Replace any blown fuses and test relays for proper operation

  7. 7. Test the Temperature Sensors

    The auxiliary heater may rely on temperature sensors to operate correctly. Test these sensors for proper resistance and functionality. Replace any faulty sensors

  8. 8. Inspect the Control Module

    If the vehicle has a control module for the auxiliary heater, check for any software updates or faults. Reprogramming or replacing the module may be necessary if it is malfunctioning

  9. 9. Review the Vehicle’s Battery and Charging System

    Ensure that the vehicle's battery is in good condition and that the charging system is functioning properly. Low voltage can affect the operation of the auxiliary heater

  10. 10. Check for Blocked Airflow

    Ensure that there are no obstructions in the airflow to and from the auxiliary heater. Blocked vents or ducts can cause overheating and trigger the code

  11. 11. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner. Take the vehicle for a test drive to see if the code reappears

  12. 12. Consult the Service Manual

    If the issue persists, consult the vehicle’s service manual for specific diagnostic procedures related to the auxiliary heater system.1

  13. 13. Seek Professional Help

    If you are unable to resolve the issue after following 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 troubleshooting steps, you should be able to identify and address the underlying cause of the B2464 code