OBD-II FAULT CODE
B2459
Aux Heater Overheat Sensor Circuit Open
Meaning, symptoms, likely causes, diagnostic checks and repair guidance for B2459.
- Body/accessory warning lamp or feature not working
- Faulty control head/switch
- Blend door actuator fault
- Blower resistor/motor issue
- Wiring/fuse fault
- Open circuit
- Check related fuses, connectors, grounds and switch/module power supply
- Check HVAC fuses, actuator movement and scan-tool HVAC data if available
- Check connector fitment and continuity from module to component
- Repair wiring/fuse issue, replace failed actuator/motor/control part after testing
- Repair open wire/connector or replace the failed component after continuity test
Related Codes
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Disclaimer: Information is provided for general guidance only and may not apply to all vehicles. Always consult a qualified technician.