B1739 DTC Code: Understanding and Resolving the Issue


If you’re encountering the B1739 DTC code, it’s important to gain a comprehensive understanding of what it signifies, how it affects your vehicle, and what steps you can take to resolve the issue. In this detailed article, we will explore the B1739 DTC code in depth, providing an explanation of its meaning, potential causes, effects, and suggested solutions. So, let’s delve into the world of automotive diagnostics!

Understanding the B1739 DTC Code

The B1739 DTC code is a diagnostic trouble code that specifically relates to the vehicle’s body control module (BCM). DTC, an acronym for Diagnostic Trouble Code, is a standardized system used by vehicles to identify and communicate specific issues. When the BCM detects a fault or malfunction within its system, it triggers the B1739 DTC code.

Potential Causes of the B1739 DTC Code

There are several factors that may trigger the B1739 DTC code. These include:

  1. Faulty BCM: A malfunctioning or defective body control module could trigger this DTC code. The BCM is responsible for managing various electronic components in the vehicle, including lighting, security systems, and more. If the module fails or experiences internal issues, it may cause the B1739 DTC code.

  2. Wiring or Connection Problems: Damaged or corroded wiring, loose connections, or poor electrical connections between the BCM and its associated components can also lead to the B1739 DTC code.

  3. Software or Programming Errors: In some cases, software glitches or programming errors within the BCM may result in the generation of the B1739 DTC code. These issues may arise during vehicle updates or due to flaws in the initial programming.

Effects of the B1739 DTC Code

When the B1739 DTC code is present, it can have various repercussions on your vehicle’s functionality. These effects may include:

  • Malfunctioning Interior and Exterior Lighting: The B1739 DTC code often results in fault lights on the dashboard, as well as issues with interior and exterior lighting such as headlights, tail lights, and indicators.

  • Electrical Malfunctions: You may experience problems with other electronic components controlled by the BCM, including issues with power windows, door locks, security systems, and more.

  • Diminished Safety Features: Faulty BCM functionality can compromise critical safety features such as anti-lock braking systems (ABS), traction control, or airbag deployment, posing a potential risk to the driver and passengers.

  • Reduced Fuel Efficiency: As the BCM plays a role in controlling various systems, including those related to fuel management, a malfunctioning BCM can lead to reduced fuel efficiency.

Resolving the B1739 DTC Code Issue

When faced with the B1739 DTC code, it is advisable to follow these steps to diagnose and resolve the problem:

  1. Consult the Vehicle’s Service Manual: The first step is to refer to the vehicle’s service manual to understand the specific details and diagnostic procedures related to the B1739 DTC code. This will provide you with valuable insights into the issue and guide you through the diagnostic process.

  2. Check for Loose Connections or Damaged Wiring: Inspect the wiring and connectors associated with the BCM, ensuring that they are intact, securely connected, and free from corrosion. Repair or replace any damaged or faulty components that you identify.

  3. Perform Diagnostic Scanning: Utilize a suitable diagnostic scanning tool to retrieve the specific trouble codes. This will provide additional information about the issues detected by the BCM and assist in the troubleshooting process.

  4. Reset the BCM: Sometimes, the B1739 DTC code may be triggered due to a temporary glitch or a non-recurring issue. Resetting the BCM can help in clearing the code and rectifying the problem. However, if the code reoccurs, further investigation is required.

  5. Seek Professional Assistance: If you are unable to diagnose or resolve the B1739 DTC code independently, it is advisable to consult a qualified automotive technician who possesses expertise in handling such issues. They have access to advanced diagnostic equipment, tools, and expertise to accurately identify the cause and provide appropriate solutions.

Frequently Asked Questions (FAQs)

Q1: Is it safe to continue driving with the B1739 DTC code?

A1: It is not recommended to drive with the B1739 DTC code because it can lead to malfunctioning safety features and compromised vehicle functionality. Seek prompt diagnosis and necessary repairs to ensure your safety.

Q2: Can I reset the B1739 DTC code myself?

A2: Yes, you can attempt to reset the code yourself by disconnecting the vehicle’s battery for a few minutes. However, it is vital to note that this is only a temporary solution, and the code may reappear if the underlying issue is not addressed.

Q3: What should I do if the B1739 DTC code keeps coming back after resetting?

A3: If the B1739 DTC code persists even after resetting, it is crucial to consult a professional technician who can accurately diagnose and resolve the underlying issue causing the code to reappear. They will utilize specialized tools and expertise to identify the root cause and provide appropriate repairs.

In conclusion, the B1739 DTC code is a clear indication of an issue within the vehicle’s body control module system. By understanding the potential causes, effects, and appropriate steps to resolve this concern, you can effectively address the issue and ensure the smooth functioning of your vehicle. Remember, proper diagnosis and repair are essential to maintaining your vehicle’s safety and performance.

About author


Meet Sam Mitchell, your experienced and reliable guide in the complex world of car fault codes. With a robust career spanning over 15 years as a professional car mechanic, John has the skills, knowledge, and practical experience to help you navigate car fault issues with confidence.


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