How to Check Trouble Codes on Your Harley-Davidson

Are you a proud owner of a Harley-Davidson, the quintessential American motorcycle? Riding a Harley is more than a mode of transportation; it's a lifestyle, a symbol of freedom and strength. But even these legendary machines can sometimes encounter issues. As a rider, it's essential to understand how to diagnose these problems, and one key skill is checking the trouble codes on your Harley-Davidson.

In this post, we'll guide you through the simple steps of checking trouble codes, a crucial aspect of motorcycle maintenance. This knowledge not only saves you time and money but also deepens your connection with your machine. Let's dive into the world of Harley diagnostics!

Step 1: Enter the Diagnostic Mode

The first step in checking your Harley's trouble codes is to enter the diagnostic mode. Turn the ignition switch to the "OFF" position. Next, hold down the odometer reset button and turn the ignition switch back to the "ON" position. Keep holding the button until the word "DIAG" appears on your speedometer screen.

Step 2: Accessing the Codes

Once in diagnostic mode, quickly press and release the odometer reset button. Your Harley will now display the current and historic codes for each module. These modules include the Engine Control Module (ECM), Body Control Module (BCM), Instrument Module (IM), and others depending on your model.

Step 3: Understanding the Codes

Harley-Davidson trouble codes consist of a series of letters and numbers. The letter corresponds to the affected system (e.g., B for Body, P for Powertrain). The following numbers give more specific information about the issue. For example, a code like "P0134" indicates an issue related to the engine's oxygen sensor.

Step 4: Clearing the Codes

After noting down the codes, you can clear them by pressing and holding the odometer reset button until you see the word "CLEAR." Remember, clearing the codes does not fix the problem; it simply resets the system's memory.

Step 5: Seeking Professional Help

If you're unsure about the meaning of a code or how to address the issue, it's always best to consult with a professional. At Myers-Duren Harley-Davidson in Tulsa, OK, our team of expert technicians is always ready to assist you. We can help interpret the codes and provide the necessary repairs or adjustments to keep your Harley running smoothly.


Understanding how to check trouble codes on your Harley-Davidson is a valuable skill for any rider. It empowers you to quickly identify potential issues and take proactive steps to ensure the longevity and performance of your motorcycle. Whether you're a seasoned rider or new to the Harley family, mastering this aspect of motorcycle maintenance enhances your riding experience.

Remember, while checking trouble codes is a great starting point for troubleshooting, it's not a substitute for professional maintenance and repair. Regular check-ups at your trusted Harley-Davidson dealership, like Myers-Duren Harley-Davidson in Tulsa, OK, are crucial to keeping your bike in top condition.

Stay ahead of maintenance and ride with confidence, knowing that you're equipped with the knowledge to understand your Harley's needs. And if you ever need help, our team at Myers-Duren Harley-Davidson is just a ride away, ready to assist with expertise and passion for these iconic machines.