How to Diagnose and Solve B2459 Aux Heater Overheat Sensor Circuit Open Issues
Introduction
If you own a car with an auxiliary heater, you may have encountered the B2459 error code. This code indicates that there is an issue with the aux heater overheat sensor circuit, which can cause the heater to malfunction. In this article, we will guide you through the process of diagnosing and solving this issue.
What is an Auxiliary Heater?
An auxiliary heater is a device that helps to warm up the interior of your car when the engine is cold. It is especially useful during the winter months when temperatures are low. The auxiliary heater works by using the heat generated by the engine to warm up the coolant, which is then circulated through the heater core and into the cabin of the car.
What is the B2459 Error Code?
The B2459 error code is a diagnostic trouble code (DTC) that indicates an issue with the aux heater overheat sensor circuit. This circuit is responsible for monitoring the temperature of the auxiliary heater and ensuring that it does not overheat. If the circuit detects that the heater is overheating, it will trigger the B2459 error code.
Diagnosing the B2459 Error Code
To diagnose the B2459 error code, you will need a diagnostic scanner that is capable of reading DTCs. Once you have the scanner, follow these steps:
Step 1: Connect the Scanner
Connect the scanner to the OBD-II port of your car. This port is usually located under the dashboard on the driver’s side.
Step 2: Read the DTCs
Use the scanner to read the DTCs stored in the car’s computer. Look for the B2459 error code.
Step 3: Check the Aux Heater Overheat Sensor Circuit
If the scanner detects the B2459 error code, the next step is to check the aux heater overheat sensor circuit. This circuit is located in the auxiliary heater and is responsible for monitoring the temperature of the heater.
Step 4: Check the Wiring
Check the wiring that connects the aux heater overheat sensor circuit to the car’s computer. Look for any signs of damage or wear.
Step 5: Check the Sensor
Check the aux heater overheat sensor itself. Make sure that it is properly connected and that there are no signs of damage or wear.
Solving the B2459 Error Code
Once you have diagnosed the B2459 error code, the next step is to solve the issue. Here are some steps you can take:
Step 1: Replace the Sensor
If the aux heater overheat sensor is damaged or worn, you will need to replace it. You can purchase a replacement sensor from your local auto parts store.
Step 2: Repair the Wiring
If the wiring that connects the aux heater overheat sensor circuit to the car’s computer is damaged or worn, you will need to repair it. You can do this by splicing in a new section of wire or by replacing the entire wiring harness.
Step 3: Replace the Auxiliary Heater
If the aux heater itself is damaged or worn, you may need to replace it. This can be a more expensive solution, but it may be necessary if the heater is beyond repair.
Conclusion
The B2459 error code can be a frustrating issue to deal with, but with the right tools and knowledge, it can be easily diagnosed and solved. By following the steps outlined in this article, you can get your auxiliary heater back up and running in no time.
FAQs
1. Can I still drive my car if the B2459 error code is present?
Yes, you can still drive your car if the B2459 error code is present. However, it is important to address the issue as soon as possible to prevent further damage to the auxiliary heater.
2. How much does it cost to replace an aux heater overheat sensor?
The cost of replacing an aux heater overheat sensor can vary depending on the make and model of your car. On average, you can expect to pay between $50 and $150 for the sensor itself, plus labor costs if you have a mechanic do the work.
3. How often should I have my auxiliary heater serviced?
It is recommended that you have your auxiliary heater serviced at least once a year to ensure that it is functioning properly. This can help to prevent issues like the B2459 error code from occurring.
