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Harley Code B1340: What It Means and How to Fix It

by

Chase Manhattan

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Owner and Editor at The Wrench Network

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Hey y’all, it’s Chase Manhattan! I’m a life-long automotive and motorcycle enthusiast with a knack for diagnostics that I hope to share with you! Lately, I’ve been running my own motorcycle rental business, which you can read about here, and it has been a great experience that has allowed me to own numerous bikes that I probably couldn’t justify otherwise. Plus, it’s been a great way to experience new places while on vacation. If you haven’t heard of them before, I definitely recommend checking out the Riders-Share platform if you get the itch to ride while away from home, or if you want to explore a cheaper way to own and ride motorcycles!

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If your Harley-Davidson motorcycle is displaying error code B1340, you may be wondering what it means and how to fix it. B1340 is a diagnostic trouble code (DTC) that indicates a problem with the front left speaker circuit. This code can be read on your Harley-Davidson without a diagnostic tool by using the trip reset button.

When your Harley-Davidson displays error code B1340, it means that the front left speaker circuit has shorted high. This can be caused by a variety of issues, including a damaged speaker, a faulty speaker wire, or a problem with the audio system’s amplifier. To diagnose and fix the problem, you may need to check the wiring and connections to the front left speaker, test the speaker itself, or replace the amplifier or other components of the audio system.

Understanding DTC B1340

If you’re having trouble with your Harley-Davidson motorcycle, you may see a diagnostic trouble code (DTC) displayed on the instrument panel. One such code is B1340, which is associated with a fault in the body control module (BCM).

Common Causes

There are several common causes of a B1340 DTC code. One possible cause is an LHCM internal error, which can occur when the left-hand control module (LHCM) fails to communicate with the BCM. Another possible cause is a short circuit in the front left speaker or its wiring. Additionally, a problem with the left air temperature actuator can trigger a B1340 code.

Symptoms and Diagnosis

When a B1340 DTC code is present, you may notice a variety of symptoms. For example, your motorcycle’s front left speaker may not work, or the air conditioning may not function properly. You may also notice that the left air temperature actuator is not working as it should.

To diagnose the problem, you should begin by using a diagnostic scanner to read the DTC codes stored in the motorcycle’s computer. Once you have identified the B1340 code, you can begin to troubleshoot the problem. This may involve checking the wiring and connectors associated with the front left speaker and LHCM, as well as testing the left air temperature actuator.

In conclusion, a B1340 DTC code can indicate a variety of problems with your Harley-Davidson motorcycle. By understanding the common causes and symptoms of this code, you can diagnose and repair the problem quickly and effectively.

Harley Electrical System Overview

If you’re experiencing issues with your Harley-Davidson motorcycle, it’s essential to have an overview of the electrical system. The electrical system is responsible for powering the engine, charging the battery, and keeping the engine running by creating sparks and injecting the right amount of fuel.

Battery and Ignition

The battery is a crucial component of the electrical system. It provides the necessary power to start the engine and powers the lights and other electrical components. The ignition system is responsible for creating sparks that ignite the fuel in the engine. The battery and ignition system work together to power the motorcycle.

If your battery is not working correctly, it can cause many issues, including difficulty starting the engine or dimming lights. If you suspect your battery is the issue, you can test it using a voltmeter. A fully charged battery should read above 12.2 volts. If your battery is not holding a charge, it may need to be replaced.

Controller Area Network (CAN)

The Controller Area Network (CAN) is a communication protocol that allows different electronic components to communicate with each other. The Electronic Control Unit (ECU) is the central controller of the CAN system. It receives information from different sensors and sends commands to various electronic components.

If you’re experiencing issues with your motorcycle’s electronic components, it could be due to a problem with the CAN system. A diagnostic tool can help you identify the issue and fix it. It’s essential to have a good understanding of the CAN system to diagnose and repair issues with your motorcycle’s electronic components.

In summary, the electrical system is a vital component of your Harley-Davidson motorcycle. It’s responsible for powering the engine, charging the battery, and keeping the engine running. Understanding the battery and ignition system and the Controller Area Network (CAN) is essential to diagnose and repair any issues with your motorcycle’s electrical system.

Handlebar Controls Troubleshooting

If you are experiencing issues with the handlebar controls on your Harley Davidson motorcycle, there are a few things you can do to troubleshoot the problem. Here are some tips to help you get started.

Left Hand Control Module (LHCM)

The LHCM is responsible for controlling the left-hand functions on your motorcycle, including the turn signals, horn, and high beams. If you are experiencing issues with any of these functions, there are a few things you can check.

First, make sure that the LHCM is properly connected to the wiring harness. Check for any loose or damaged connections, and ensure that all wires are properly grounded.

If the LHCM is properly connected, you may need to check the buttons themselves. If the up button is stuck, for example, this can prevent the LHCM from functioning properly. Try gently pressing the button to see if it releases.

Right Hand Control Module (RHCM)

The RHCM is responsible for controlling the right-hand functions on your motorcycle, including the starter and information display. If you are experiencing issues with any of these functions, there are a few things you can check.

First, make sure that the RHCM is properly connected to the wiring harness. Check for any loose or damaged connections, and ensure that all wires are properly grounded.

If the RHCM is properly connected, you may need to check the buttons themselves. If the info button is stuck, for example, this can prevent the RHCM from functioning properly. Try gently pressing the button to see if it releases.

Remember that there are many other factors that can cause issues with your handlebar controls, including issues with the wiring harness or other components. If you are unable to resolve the issue on your own, it may be best to take your motorcycle to a qualified mechanic for further diagnosis and repair.

Radio and Sound System Issues

If you’re experiencing problems with your Harley Davidson’s radio or sound system, it can be frustrating. Fortunately, many of these issues can be resolved with a little troubleshooting. In this section, we’ll cover some common radio and sound system problems, including radio error codes and sound system malfunctions.

Radio Error Codes

One of the most common radio issues is the appearance of error codes. If you see an error code on your radio display, it can be helpful to know what it means. One common error code for Harley Davidson radios is B1340. This code indicates a problem with the rear volume up button being stuck.

To fix this issue, you can try cleaning the button or replacing it if necessary. If the problem persists, it may be necessary to take your bike to a professional for repair.

Another error code you may encounter is B1346. This code indicates a problem with the radio’s speaker output circuit. This could be caused by a blown fuse or a damaged speaker. You can try checking and replacing the fuse or speaker to resolve the issue.

Sound System Malfunctions

In addition to error codes, you may experience other sound system malfunctions. One common issue is a lack of sound or poor sound quality. This could be caused by a variety of factors, including a damaged speaker or wiring issues.

If you’re experiencing sound problems, you can try checking the wiring and connections to ensure everything is properly connected. You can also try replacing the speakers or amplifier if necessary.

Another common issue is the radio turning on and off by itself. This could be caused by a faulty ignition switch or wiring issues. You can try checking the wiring and connections to resolve the issue.

Overall, troubleshooting radio and sound system issues on your Harley Davidson can be a bit challenging, but with a little patience and persistence, you can often resolve the issue on your own. If you’re unsure about how to proceed or the problem persists, it’s always a good idea to seek professional assistance.

Engine and Transmission Codes

When it comes to Harley-Davidson motorcycles, the engine and transmission codes are essential to understanding the performance of your bike. These codes can help you diagnose problems and make necessary repairs. In this section, we will explore two crucial subsections: Fuel Injection System and Vehicle Speed Sensor (VSS).

Fuel Injection System

The Fuel Injection System (FI) is responsible for delivering fuel to the engine. If your bike is experiencing problems related to fuel delivery, it is likely that you will see a code related to the Fuel Injection System. One such code is Fuel Signal High (B1340).

Fuel Signal High (B1340) is a code that indicates that the fuel signal to the engine is too high. This could be caused by a faulty fuel injector or a problem with the fuel pump. If you are experiencing this code, it is important to have your bike inspected by a professional mechanic.

Vehicle Speed Sensor (VSS)

The Vehicle Speed Sensor (VSS) is responsible for monitoring the speed of your bike. If your bike is experiencing problems related to speed, it is likely that you will see a code related to the Vehicle Speed Sensor. One such code is VSS Low (B1340).

VSS Low (B1340) is a code that indicates that the speed signal to the engine is too low. This could be caused by a faulty sensor or a problem with the wiring. If you are experiencing this code, it is important to have your bike inspected by a professional mechanic.

In conclusion, understanding the engine and transmission codes on your Harley-Davidson motorcycle is crucial to maintaining its performance. By familiarizing yourself with the Fuel Injection System and Vehicle Speed Sensor, you can diagnose and repair problems quickly and efficiently.

Body Control Module (BCM) Insights

If you own a Harley-Davidson motorcycle, you may be familiar with the Body Control Module (BCM). The BCM is a crucial component that controls various electrical systems such as lighting, ignition, and security. It is responsible for monitoring and managing the signals that run through the bike’s wiring harness.

BCM Error Codes

One of the most common BCM error codes is B1340. This code indicates that there is a short circuit in the front left speaker. When this error code appears, the speaker may not work properly or may not work at all. You can troubleshoot this issue by checking the wiring and connections to the front left speaker. If you find any issues, you can repair or replace the wiring or connections as needed.

Another error code related to the BCM is B1338. This code indicates that there is a problem with the left rear turn signal. If you encounter this error code, you should check the wiring and connections to the left rear turn signal. You can also check the turn signal bulb and replace it if necessary.

Finally, B1342 is another error code that may appear related to the BCM. This code indicates that there is a problem with the ignition switch. You can troubleshoot this issue by checking the wiring and connections to the ignition switch. If you find any issues, you can repair or replace the wiring or connections as needed.

In conclusion, the BCM is an essential component of your Harley-Davidson motorcycle. If you encounter any error codes related to the BCM, you can troubleshoot them by checking the wiring and connections to the affected components. By following these steps, you can resolve the issue and get back to enjoying your ride.

Advanced Diagnostics and Tools

If you’re experiencing Harley code B1340, you may need to use advanced diagnostic equipment to properly diagnose and fix the issue. Here are some tips on how to use diagnostic equipment to interpret advanced trouble codes.

Using Diagnostic Equipment

To diagnose Harley code B1340, you’ll need to use an OBD-II scanner or appropriate diagnostic tool. These tools can help you retrieve and record the B1340 DTC code, which will provide insight into the specific issue.

When using diagnostic equipment, it’s important to follow the manufacturer’s instructions carefully. Make sure you have the right equipment for the job and that you know how to use it properly.

Interpreting Advanced Trouble Codes

Harley code B1340 is an advanced trouble code, which means it requires a deeper level of diagnosis than a basic trouble code. To interpret advanced trouble codes, you’ll need to have a good understanding of the ECU and how it works.

When interpreting advanced trouble codes, it’s important to pay attention to the specific code and any associated codes that may be present. For example, Harley codes B1103 and B1153 may be related to B1340, so it’s important to check for these codes as well.

Finally, it’s important to remember that advanced trouble codes can be tricky to diagnose. If you’re not sure how to interpret a code or fix the issue, it’s always best to consult a professional mechanic.

By using diagnostic equipment and interpreting advanced trouble codes, you can get to the root of Harley code B1340 and fix the issue for good.

Maintaining Your Harley’s Health

Preventive Measures

Taking preventive measures can help keep your Harley running smoothly and avoid costly repairs. Here are some tips to keep in mind:

  • Check your battery regularly to make sure it is fully charged and functioning properly. A weak battery can cause issues with the ignition system and other electrical components.

  • Make sure your ignition switch is functioning properly. A faulty switch can cause starting issues and other problems.

  • Keep up with regular maintenance tasks, such as oil changes and tire rotations. Neglecting these tasks can lead to bigger issues down the road.

Scheduled Maintenance

In addition to regular maintenance tasks, there are also certain tasks that should be performed on a schedule. Here are some examples:

  • Every 5,000 to 7,000 miles, you should have your air filter checked and replaced if necessary. A dirty air filter can reduce performance and cause other issues.

  • Every 10,000 miles, you should have your spark plugs checked and replaced if necessary. Worn or dirty spark plugs can cause starting issues and reduce performance.

  • Every 20,000 miles, you should have your fuel filter checked and replaced if necessary. A clogged fuel filter can cause fuel delivery issues and reduce performance.

By following these preventive measures and keeping up with scheduled maintenance, you can help ensure that your Harley runs smoothly and avoid costly repairs.

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