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B1006 Harley Code: Causes and Solutions

Chase Manhattan Avatar

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Harley Code B1006 is a common issue that many Harley-Davidson riders face. It is a diagnostic trouble code that indicates a problem with the accessory line voltage. When the accessory line voltage exceeds 16 volts for more than 10 seconds, the B1006 Harley code is displayed. This overvoltage to the accessories can lead to various issues that can affect the performance of the motorcycle.

Diagnosing the B1006 code can be a bit tricky, but it is essential to address the issue as soon as possible. Some of the possible causes of the B1006 code include a faulty voltage regulator, a malfunctioning accessory, or wiring issues. Harley riders can diagnose the B1006 code by checking the voltage of the accessory line, inspecting the wiring for any damage or loose connections, and testing the voltage regulator. Once the issue has been identified, riders can take the necessary steps to fix the problem and get their motorcycle back on the road.

In conclusion, the B1006 code is a common issue that Harley-Davidson riders face. It is essential to diagnose and fix the issue as soon as possible to avoid any further damage to the motorcycle. By checking the voltage of the accessory line, inspecting the wiring, and testing the voltage regulator, riders can identify the root cause of the problem and take the necessary steps to fix it.

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Understanding Harley Code B1006

Harley Code B1006 is a diagnostic trouble code that indicates an issue with the accessory line voltage. This code is significant as it can lead to potential problems with the engine, headlights, speedometer, tachometer, and other electrical components in the motorcycle. The code is triggered when the accessory line voltage is higher than 16.0 volts for over five seconds.

The accessory line voltage is the voltage that powers the electrical components in the motorcycle, such as the headlights, speedometer, and tachometer. When the voltage is too high, it can cause damage to these components and potentially cause the engine to malfunction.

Common Symptoms

Some common symptoms of Harley Code B1006 include:

  • The engine may not start or may stall
  • The headlights may flicker or not work at all
  • The speedometer and tachometer may not function properly
  • The error code may appear on the dashboard

If any of these symptoms are present, it is important to have the motorcycle diagnosed by a professional to determine the exact cause of the problem.

Harley Code B1006 is a significant diagnostic trouble code that can lead to potential problems with the engine and other electrical components in the motorcycle. It is important to have the motorcycle diagnosed by a professional if any of the common symptoms are present to ensure that the issue is resolved promptly and effectively.

Electrical System Overview

The electrical system of a Harley-Davidson motorcycle is a critical component that powers the bike’s accessories and provides the necessary voltage to start the engine. The system comprises several parts, including the battery, charging system, voltage regulator, and power distribution.

Battery and Charging System

The battery is the heart of the electrical system, providing the necessary power to start the engine and run the bike’s accessories. The battery connections must be clean and tight to ensure proper functioning. The charging system works to keep the battery charged while the engine is running. It consists of the stator, rotor, and rectifier regulator.

Accessory Line and Power Distribution

The accessory line is a power line that supplies voltage to the bike’s accessories, such as lights, radios, and GPS systems. The power distribution module distributes power to the various components of the bike, including the ignition switch and the accessory line.

Over voltage issues can occur in the electrical system, leading to the generation of error codes such as B1006. This error code indicates that the accessory line voltage is higher than 16.0 volts for over five seconds. The causes of this error code can include a charging system malfunction or a faulty battery.

To fix the B1006 error code, the possible causes must be diagnosed. If the issue is with the charging system, the voltage regulator may need to be replaced. If the battery is faulty, it may need to be replaced. In some cases, the load equalizer and LED lamps may cause the error code to appear, in which case they may need to be removed.

Overall, understanding the electrical system of a Harley-Davidson motorcycle is essential for troubleshooting and maintaining the bike’s performance. Regular inspections and maintenance of the battery, charging system, and power distribution can help prevent issues and ensure a smooth ride.

Initial Inspection and Tools

When a Harley-Davidson motorcycle displays the B1006 code, it indicates a possible charging system malfunction. The first step in diagnosing this issue is to inspect the battery and the charging system. The following tools will be needed to diagnose the problem:

  • A digital multimeter
  • A Harley-Davidson Electrical Diagnostics Manual (EDM)
  • A fuse tester
  • A battery load tester

To diagnose the B1006 code, follow these steps:

  1. Turn off the motorcycle’s ignition and remove the seat to access the battery.
  2. Check the battery’s voltage with a digital multimeter. The voltage should be between 11.6V-13.8V. If the voltage is too low, recharge or replace the battery.
  3. Check the battery ground cable for corrosion or damage. A faulty ground cable can cause the B1006 code to appear. If the cable is damaged, replace it.
  4. Check the charging system’s voltage regulator. The voltage regulator regulates the voltage that goes to the battery. Use the EDM to test the regulator’s resistance and ground. If the regulator is faulty, replace it.
  5. Check the charging system’s stator. The stator generates the power that the regulator regulates. Use the EDM to test the stator’s resistance and ground. If the stator is faulty, replace it.
  6. Check the charging system’s fuse. A blown fuse can cause the B1006 code to appear. Use a fuse tester to test the fuse. If the fuse is blown, replace it.

By following these steps, it should be possible to diagnose and repair the issue causing the B1006 code to appear. It is important to use the EDM and the appropriate tools to ensure an accurate diagnosis.

Addressing Overvoltage Issues

When it comes to addressing overvoltage issues, there are several things that can be done to fix or prevent the problem. One of the first things to check is the battery ground cable. A loose or corroded connection can cause high voltage issues. Make sure that the cable is tight and free of corrosion.

Another potential cause of overvoltage issues is a faulty voltage regulator. If this is the case, the regulator will need to be replaced. It is important to use a high-quality replacement part to ensure that the issue does not continue.

Dielectric grease can also be used to improve electrical connections and prevent overvoltage issues. This grease is designed to repel moisture and prevent corrosion, which can help to improve the overall performance of the electrical system.

Improving Electrical Connections

Improving electrical connections is another important step in preventing overvoltage issues. This can be done by cleaning and tightening all of the connections in the electrical system. It is also a good idea to inspect the wiring for any signs of damage or wear.

In addition to cleaning and tightening connections, it is also important to use high-quality components when repairing or replacing parts in the electrical system. This includes using high-quality wiring, connectors, and other components.

By taking these steps to address overvoltage issues and improve electrical connections, riders can help to prevent the B1006 error code from occurring and ensure that their Harley is running smoothly and reliably.

Upgrading Electrical Components

Harley Code B1006 is an error code related to accessory line overvoltage. It is a common issue that arises when the motorcycle’s electrical components are not functioning correctly. To solve this problem, one can upgrade their electrical components by replacing them with aftermarket solutions.

Aftermarket Solutions

Upgrading the electrical components with aftermarket solutions can help solve the B1006 error code. Custom Dynamics and Badlands are two popular brands that provide high-quality electrical components for Harley Davidson motorcycles. These components are designed to enhance the voltage stability of the motorcycle and reduce the chances of overvoltage.

Enhancing Voltage Stability

One of the most effective ways to enhance voltage stability is by installing a voltage regulator. A voltage regulator is designed to regulate the voltage output of the motorcycle’s electrical system. It ensures that the voltage output remains within a safe range, reducing the chances of overvoltage.

Another way to enhance voltage stability is by installing a Badlands Load Equalizer. A load equalizer is designed to provide a steady voltage output to the motorcycle’s LED lights. It reduces the chances of voltage spikes and overvoltage, ensuring that the lights function correctly.

In conclusion, upgrading the electrical components of a Harley Davidson motorcycle can help solve the B1006 error code. Aftermarket solutions such as Custom Dynamics and Badlands provide high-quality components that enhance voltage stability and reduce the chances of overvoltage. Installing a voltage regulator and a load equalizer are two effective ways to enhance voltage stability and reduce the chances of overvoltage.

Understanding Related Codes

When it comes to Harley-Davidson motorcycles, there are a number of diagnostic trouble codes (DTCs) that can be displayed on the instrument cluster. One of the most common codes is B1006, which indicates that there is an issue with the accessory line voltage. However, there are a few other related codes that riders should be aware of.

Code B1007 and Its Implications

Code B1007 is another error code that is related to voltage issues. Specifically, this code indicates that the ignition line voltage is greater than 16.0 volts for more than five seconds. This can cause a number of problems, including damage to the battery, alternator, and other electrical components.

If you see code B1007 on your Harley-Davidson motorcycle, it is important to take it seriously and have it checked out by a professional mechanic. Ignoring this code could lead to serious damage to your motorcycle and put you at risk while riding.

Other Common Harley DTCs

In addition to codes B1006 and B1007, there are a few other common DTCs that riders should be aware of. These include:

  • P0132: This code indicates that there is an issue with the oxygen sensor circuit, which can cause problems with fuel economy and emissions.
  • ABS codes: If your Harley-Davidson motorcycle is equipped with an anti-lock braking system (ABS), there are a number of DTCs that can be displayed related to this system. These codes can indicate issues with the wheel speed sensors, hydraulic pump, and other components.
  • BCM codes: The body control module (BCM) on your Harley-Davidson motorcycle is responsible for controlling a number of electrical systems, including the lighting, climate control, and power windows (if equipped). If there is an issue with the BCM, you may see a number of DTCs related to these systems.

Understanding the related codes to B1006 is important for Harley-Davidson riders. By being aware of the potential issues that can arise and taking action to address them, riders can ensure that their motorcycles are running smoothly and safely.

Maintaining the Electrical System

To prevent Harley Code B1006 from occurring, owners should maintain their motorcycle’s electrical system. Regularly checking the battery, wiring, and connections can help ensure that the system is functioning properly. A faulty battery or damaged wiring can cause the system to overload, leading to the error code. Therefore, it is important to inspect the battery and wiring for any signs of wear or damage.

Additionally, owners should ensure that their motorcycle’s charging system is working correctly. A malfunctioning charging system can cause the battery to overcharge, resulting in the error code. To prevent this, owners should have their charging system checked regularly by a professional mechanic.

Using the Trip Odometer Reset Switch

Another practical tip for owners to prevent Harley Code B1006 is to use the trip odometer reset switch. By following a few simple steps, owners can check their motorcycle’s error codes and diagnose any issues.

First, the owner should turn on the ignition switch and hold down the odometer button for five seconds. The word “DIAG” will appear on the display, indicating that the diagnostic mode has been activated. Next, the owner should tap the odometer button once to display the ECM code. If the code “ECM Y” appears, it means that there is a current error code. If “ECM N” appears, it means that there are no current error codes.

By using the trip odometer reset switch, owners can quickly diagnose any issues with their motorcycle’s electrical system and take the necessary steps to prevent Harley Code B1006 from occurring.

Overall, maintaining the electrical system and using the trip odometer reset switch are two practical tips that can help prevent Harley Code B1006. By following these tips, owners can keep their motorcycle running smoothly and avoid costly repairs.


What does the B1007 code indicate on a Harley Davidson motorcycle?

The B1007 code on a Harley Davidson motorcycle indicates that the ignition line voltage is greater than 16.0 volts for more than five seconds. This means that your instruments are getting too much voltage and should be between 11.6V-13.8V.

How is the U1040 code related to Harley Davidson diagnostics?

The U1040 code on Harley Davidson diagnostics indicates a communication issue between the ECM and the speedometer. This can be caused by a faulty wiring connection or a bad speedometer.

What issues are typically associated with the U1016 code on Harley motorcycles?

The U1016 code on Harley motorcycles indicates a loss of communication with the ECM. This can be caused by a faulty wiring connection, a bad ECM, or a bad ignition switch.

What does the B0563 code signify on a Harley Davidson and how is it resolved?

The B0563 code on a Harley Davidson signifies an issue with the accessory switch. To resolve the problem, you need to check the wiring and connections to the switch. If the wiring and connections are fine, replace the switch.