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Engine-Codes – Generic – B104E

B104E Code - Blend Door Control Circuit High

Quick Answer

The B104E diagnostic trouble code (DTC) refers to a Blend Door Control Circuit High. Common causes include Wiring issues such as short circuits or open circuits, Faulty blend door actuator, Defective HVAC control module. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means
B104E indicates Blend Door Control Circuit High.
Common causes
Common causes include Wiring issues such as short circuits or open circuits, Faulty blend door actuator, Defective HVAC control module.
Severity
Low - monitor the vehicle and repair when practical.
Can I drive?
The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code B104E Description

The B104E diagnostic trouble code (DTC) refers to a Blend Door Control Circuit High. This code indicates that there is a high voltage condition detected in the circuit that controls the blend door in the HVAC (Heating, Ventilation, and Air Conditioning) system of the vehicle. The blend door is responsible for controlling the flow of air from the heater core and the air conditioning evaporator, allowing the driver and passengers to adjust the temperature inside the vehicle.

OBDII Code B104E - Blend Door Control Circuit High
B104E Code - Blend Door Control Circuit High

Common Causes of B104E

  1. Wiring issues such as short circuits or open circuits
  2. Faulty blend door actuator
  3. Defective HVAC control module
  4. Malfunctioning blend door
  5. Electrical issues such as blown fuses or relays

Symptoms of B104E

  1. Inconsistent temperature output from the HVAC system
  2. Inability to adjust the temperature settings
  3. Unresponsive HVAC controls
  4. Strange noises coming from the HVAC system
  5. Reduced overall efficiency of the HVAC system

How to Fix B104E

  1. Begin by conducting a thorough inspection of the wiring harness and connectors associated with the blend door control circuit.
  2. Test the blend door actuator for proper operation and replace if necessary.
  3. Check the HVAC control module for any signs of damage or malfunction and replace if needed.
  4. Inspect the blend door itself for any obstructions or damage and replace if required.
  5. Clear the DTC from the vehicle's memory using a diagnostic scanner after completing the repairs.

Cost to Fix B104E

The cost of repairing a Blend Door Control Circuit High issue can vary depending on the specific cause of the problem and the labor rates at the auto repair shop. In general, the cost of parts for this repair can range from $100 to $300, while labor costs can add another $100 to $200 to the total bill. It's important to note that diagnostic time and labor rates can vary, so it's recommended to consult with a trusted auto repair shop to get a more accurate estimate for your specific vehicle.

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Code B104E Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B104E Code

1. What are the common symptoms of OBDII code B104E (Blend Door Control Circuit High)?

The common symptoms of OBDII code B104E include the inability to control the temperature inside the vehicle, inconsistent or incorrect air flow from the HVAC system, and potential issues with the heating or cooling function.

2. What can cause the OBDII code B104E to trigger?

The OBDII code B104E (Blend Door Control Circuit High) can be triggered by a faulty blend door actuator, damaged wiring or connectors in the blend door control circuit, or issues with the HVAC control module.

3. How can I diagnose the cause of OBDII code B104E?

Diagnosing the cause of OBDII code B104E typically involves using a diagnostic scanner to retrieve the code, checking the blend door actuator for proper operation, inspecting the wiring and connectors for damage, and testing the HVAC control module for any malfunctions.

4. Can I continue driving with OBDII code B104E active?

While it may be possible to continue driving with OBDII code B104E active, it is not recommended as it can lead to discomfort due to the inability to control the interior temperature of the vehicle. It is advisable to address the issue promptly to avoid further complications.

5. How can I repair OBDII code B104E?

Repairing OBDII code B104E involves identifying and addressing the underlying cause, which may include replacing the blend door actuator, repairing damaged wiring or connectors, or reprogramming the HVAC control module. It is recommended to consult a professional mechanic for an accurate diagnosis and proper repair.

6. Is OBDII code B104E a serious issue?

While OBDII code B104E may not pose immediate safety risks, it can result in discomfort and inconvenience due to the HVAC system's malfunction. Ignoring the issue can lead to further complications and potentially affect the vehicle's overall functionality.

7. Can I reset OBDII code B104E without fixing the underlying problem?

Resetting OBDII code B104E without addressing the underlying issue is not recommended, as the code is likely to reappear once the problem persists. It is essential to diagnose and repair the root cause to prevent ongoing issues with the blend door control circuit.

8. How much does it cost to fix OBDII code B104E?

The cost of fixing OBDII code B104E can vary depending on the cause of the issue, the necessary repairs or replacements, and labor costs. It is advisable to obtain quotes from different mechanics or repair shops to determine the most cost-effective solution.

9. Can extreme temperatures or weather conditions trigger OBDII code B104E?

Extreme temperatures or weather conditions can potentially exacerbate issues related to the blend door control circuit, leading to the triggering of OBDII code B104E. It is essential to address any HVAC system problems promptly, especially in harsh environmental conditions.

10. How can I prevent OBDII code B104E from recurring in the future?

To prevent OBDII code B104E from recurring in the future, it is essential to perform regular maintenance on the HVAC system, including checking the blend door actuator, inspecting wiring for damage, and ensuring proper functioning of the HVAC control module. Regular inspections can help detect and address potential issues before they trigger the code again.

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