Harley Davidson Bcm Problems

Have you ever experienced any issues with the BCM (Body Control Module) in your Harley Davidson? You know, those frustrating moments when your bike’s electrical system starts acting up and you’re left wondering what went wrong. Well, you’re not alone. Many Harley Davidson owners have faced problems with their BCMs, and in this article, we’re going to dive into the details of these issues and explore possible solutions.

When it comes to Harley Davidson BCM problems, there can be a range of issues that riders encounter. From malfunctioning lights and turn signals to problems with the ignition system, these electrical glitches can disrupt your riding experience and make you feel perplexed. But fear not! In this article, we’ll cover the common symptoms of BCM problems, such as non-functioning accessories, flickering lights, and sudden engine shutdowns. We’ll also explore the potential causes behind these issues, such as water damage or faulty wiring. So, if you’ve been scratching your head wondering why your bike’s electrical system is behaving strangely, keep reading because we’ve got you covered. You’ll find out more about the signs to look out for and the steps you can take to diagnose and fix Harley Davidson BCM problems.

Harley Davidson BCM Problems


Harley Davidson motorcycles are known for their iconic design and powerful performance. However, like any other vehicle, they are not immune to technical issues. One common problem that Harley Davidson owners may encounter is related to the Body Control Module (BCM). The BCM is responsible for managing various electrical and control functions in the motorcycle, and when it malfunctions, it can lead to a range of issues. In this article, we will discuss the symptoms, causes, troubleshooting methods, repairs, preventive maintenance tips, the importance of professional assistance, recalls and service bulletins, and customer experiences and reviews related to Harley Davidson BCM problems.

1. Symptoms of Harley Davidson BCM Problems

Before diving into the causes and troubleshooting methods, it’s important to identify the symptoms that indicate potential BCM problems. Here are some common signs to watch out for:

Intermittent Electrical Malfunctions

If you notice that certain electrical components, such as the lights, turn signals, horn, or even the ignition system, are behaving erratically or not functioning at all, it could be a sign of BCM problems. These intermittent issues can be frustrating and may even pose a safety risk while riding.

Loss of Control Functions

The BCM is also responsible for managing control-related functions, such as the ABS system and the throttle control. If you experience a loss of control or unconventional behavior from these systems, it could be due to faulty BCM.

Warning Lights and Messages

A malfunctioning BCM can trigger warning lights and error messages on the instrument cluster. These warnings could include ABS or engine malfunctions, low battery alerts, or other error codes. Ignoring these warnings can lead to further damage and potential breakdowns.

Harley Davidson Bcm Problems

2. Causes of Harley Davidson BCM Problems

Understanding the causes of BCM problems can help in preventing them or addressing the issues effectively. Here are some common culprits:

Faulty Wiring

One of the leading causes of BCM problems is faulty wiring. Over time, the electrical connections within the motorcycle can deteriorate, leading to poor conductivity or even complete loss of connection. This can result in various electrical malfunctions and ultimately affect the BCM’s performance.

Water Damage

Harley Davidson motorcycles are designed to withstand different weather conditions, but exposure to excessive moisture or water can still cause damage. If water seeps into the BCM or its wiring connections, it can lead to corrosion and short circuits, compromising the BCM’s functionality.

Overheating Issues

The BCM is located in a relatively hot area of the motorcycle, and if the bike is exposed to extreme temperatures or if the cooling system is not functioning properly, it can lead to overheating of the BCM. Overheating can cause the internal components to fail, resulting in BCM problems.

3. Troubleshooting Harley Davidson BCM Problems

If you suspect that your Harley Davidson motorcycle is experiencing BCM problems, there are several troubleshooting methods you can try before seeking professional help. Here are some recommended steps:

Diagnostic Tools and Software

Investing in a diagnostic tool or software specifically designed for Harley Davidson motorcycles can be immensely helpful in identifying BCM issues. These tools can communicate with the motorcycle’s onboard computer system and provide detailed error codes and diagnostic reports, facilitating an accurate diagnosis.

Testing Battery Voltage

A weak or faulty battery can sometimes cause BCM issues. By testing the battery voltage using a multimeter, you can determine if the battery is supplying the required power to the BCM. If the voltage is below the recommended level, it may be time to replace the battery.

Checking Fuse Connections

Faulty fuse connections can disrupt the flow of electricity to the BCM. Inspecting the fuse box and connections for any signs of damage or loose connections is a simple step that can potentially resolve BCM problems. Replacing blown fuses with new ones can also help in restoring proper functionality.

Harley Davidson Bcm Problems

4. Common Harley Davidson BCM Repairs

In some cases, troubleshooting may not be sufficient, and repairs may be necessary to address BCM problems. Here are some common repairs associated with Harley Davidson BCM issues:

BCM Replacement

If the BCM is diagnosed as irreparable or if the problems persist despite troubleshooting efforts, a complete replacement may be required. It is essential to ensure that the replacement BCM is compatible with your motorcycle’s model and year.

Wiring Harness Repair

In cases where faulty wiring is the cause of BCM problems, repairing or replacing the damaged wires and connectors can effectively resolve the issues. This repair may require expertise and knowledge of motorcycle wiring systems.

BCM Software Updates

In certain instances, Harley Davidson releases software updates for the BCM to address known issues or improve performance. Updating the BCM’s software version can help in rectifying software-related problems and enhancing its functionality.

5. Preventive Maintenance Tips

As the saying goes, prevention is better than cure. By following these preventive maintenance tips, you can reduce the likelihood of encountering BCM problems:

Regular Inspection for Damage

Perform a visual inspection of the BCM and its wiring connections regularly. Look for signs of corrosion, loose connections, or physical damage. Addressing these issues early on can prevent major problems in the future.

Proper Waterproofing Techniques

If you frequently ride your Harley Davidson motorcycle in wet or rainy conditions, it is crucial to apply appropriate waterproofing techniques to protect the BCM and its wiring connections. Using dielectric grease or protective sprays can help in preventing water damage.

Avoiding Overheating

To prevent overheating issues, ensure that your motorcycle’s cooling system is functioning optimally. Avoid riding in extreme temperatures for extended periods and park your bike in a shaded area whenever possible. Regular maintenance and monitoring of the cooling system can prevent BCM problems associated with overheating.

6. Importance of Professional Assistance

While some BCM issues can be resolved through troubleshooting and simple repairs, it is essential to acknowledge the importance of professional assistance when dealing with more complex problems. Here’s why:

Qualified Technicians

Harley Davidson motorcycles are intricate machines, and the BCM is a crucial component that requires specialized knowledge for troubleshooting and repairs. Professional technicians have the training and expertise to handle BCM issues effectively and ensure proper diagnosis and resolution.

Access to Specialized Tools

Professional service centers are equipped with specialized tools and equipment that are specifically designed for diagnosing and repairing Harley Davidson motorcycles. These tools can provide accurate readings, diagnose complex issues, and ensure precise repairs, minimizing the risk of further damage.

Warranty Considerations

If your motorcycle is still under warranty, attempting DIY repairs or unauthorized modifications could void the warranty. Seeking professional assistance ensures that the repairs are carried out according to the manufacturer’s guidelines, retaining warranty coverage if applicable.

7. Recalls and Service Bulletins

Harley Davidson monitors the performance of their motorcycles and periodically issues recalls and service bulletins to address potential safety or quality issues. It is crucial to stay informed about any relevant recalls or service bulletins related to the BCM in your specific model. This information can be obtained from the official Harley Davidson website or by contacting authorized dealerships.

Manufacturer Recalls

Manufacturer recalls are issued when a specific component or system has been identified to have a safety-related defect. If a recall is issued for the BCM or any related components in your Harley Davidson motorcycle, it is imperative to schedule a visit to an authorized dealership for the necessary repairs or replacements.

Technical Service Bulletins

Technical Service Bulletins (TSBs) are issued by the manufacturer to provide guidance to service technicians for known issues, repairs, or software updates. Checking for TSBs related to the BCM in your motorcycle model can help in resolving problems more accurately and efficiently.

Warranty Coverage

In some cases, BCM problems may be covered under warranty. It is essential to review your motorcycle’s warranty terms and contact the authorized dealership to determine if the repairs fall within warranty coverage. This can save you from unnecessary expenses associated with BCM repairs.

8. Customer Experiences and Reviews

Real-life experiences and feedback from Harley Davidson owners who have encountered BCM problems can provide valuable insight and potentially even solutions. Here are some sources to consider:

Real-Life Stories

Engaging with fellow Harley Davidson owners and sharing experiences can provide a wealth of information. Attend motorcycle club gatherings, meet-ups, or forums to interact with individuals who have faced similar BCM problems and learn from their experiences.

Online Community Discussions

Online platforms, such as social media groups or community forums dedicated to Harley Davidson motorcycles, are great sources of knowledge and support. Participating in discussions and asking questions about BCM problems can connect you with like-minded individuals and provide potential solutions or recommendations.

Solutions Shared by Owners

Harley Davidson owners who have successfully resolved BCM problems may share their solutions or workarounds online. These user-generated solutions may offer valuable insights and guidance that can help you address your own BCM issues.


The Body Control Module is a critical component in Harley Davidson motorcycles, and its proper functioning is essential for a smooth and safe riding experience. By understanding the symptoms, causes, and troubleshooting methods for BCM problems, you can effectively address issues and minimize potential damage. Regular maintenance, preventive measures, and seeking professional assistance when necessary, can help keep your Harley Davidson running smoothly and ensure an enjoyable riding experience. Remember, staying informed, connecting with the community, and learning from others’ experiences can go a long way in resolving BCM problems effectively.

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