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Harley Code U0158: Understanding and Troubleshooting Tips

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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 you own a Harley-Davidson motorcycle, you may come across various error codes that can appear on your dashboard. One of the most common codes that Harley-Davidson owners encounter is the U0158 code. This code indicates that there is a communication error between the Head Up Display (HUD) and other modules in your motorcycle’s system.

When the U0158 code appears, it means that the HUD is unable to communicate with other modules in the motorcycle’s system, or there is a loss of power or ground to the HUD. This can cause the engine light or service engine soon warning light to illuminate on your dashboard. If you experience this issue, it is important to address it as soon as possible to prevent any further damage to your motorcycle’s system.

Fortunately, there are ways to fix the U0158 code. You can check all fuses that power up the HUD module on your motorcycle. If the fuses are in good condition, you may need to check the wiring harnesses and connections to the HUD to ensure that they are properly connected. If you are unable to diagnose and fix the issue yourself, it is recommended to take your motorcycle to a professional mechanic who specializes in Harley-Davidson motorcycles.

Understanding Harley Code U0158

If you are experiencing issues with your Harley-Davidson motorcycle, the U0158 code may be the culprit. This code indicates that there is a problem with the communication between the Body Control Module (BCM) and the Head-Up Display (HUD) module. Here is what you need to know about this code.

Symptoms of U0158

The most common symptom of the U0158 code is the illumination of the Engine Light or Service Engine Soon Warning Light. This may also be accompanied by a loss of functionality of the HUD. You may notice that the display is not working correctly or that it is completely black. In some cases, the HUD may display incorrect information or may not display anything at all.

Lost Communication Issues

The U0158 code indicates that there is a communication issue between the BCM and the HUD module. This could be due to a number of reasons, including a faulty HUD module, an open or shorted harness, or a poor electrical connection.

To diagnose the issue, you will need to check the fuses that power up the HUD module. If the fuses are intact, you may need to check the electrical connections and wiring. In some cases, the BCM may need to be replaced.

In conclusion, the U0158 code can be a frustrating issue to deal with, but it is important to address it as soon as possible to avoid further complications. If you are unsure about how to diagnose or fix the issue, it is recommended that you seek the help of a professional mechanic.

Common Harley Trouble Codes

If you own a Harley-Davidson motorcycle, you might have seen trouble codes on your instrument cluster or heard about them from other riders. These codes are a way for your bike’s onboard computer to communicate with you about any issues it has detected. Here are some of the most common Harley trouble codes you might encounter:

CAN Bus Related Codes

The CAN Bus is a communication system used by many modern vehicles, including Harley-Davidson motorcycles. If there is an issue with the CAN Bus, you might see one of the following codes:

  • P0562: Battery Voltage Low
  • U0184: Lost Communication With Radio
  • U0158: Lost Communication With Head-Up Display

If you see any of these codes, it could indicate a problem with the wiring or connectors that make up the CAN Bus system. It’s best to take your bike to a qualified mechanic to diagnose and fix the issue.

Ignition and Battery Codes

Your Harley’s ignition system and battery are critical components that keep your bike running smoothly. If there is an issue with either of these systems, you might see one of the following codes:

If you see these codes, it could indicate a problem with your bike’s battery or charging system. It’s important to get this issue resolved quickly, as a failing battery can leave you stranded on the side of the road.

In conclusion, trouble codes can be a useful tool for diagnosing issues with your Harley-Davidson motorcycle. If you see any of these codes, it’s best to take your bike to a qualified mechanic to diagnose and fix the issue.

Diagnostic Process

When your Harley-Davidson motorcycle is displaying the U0158 diagnostic trouble code, it indicates that there is a loss of communication with the head-up display module. To diagnose and repair this issue, you will need to follow a few steps.

Reading Codes

The first step in diagnosing the U0158 code is to read the diagnostic trouble codes stored in the onboard diagnostic (OBD) system. To do this, you will need a diagnostic tool that is compatible with your Harley-Davidson motorcycle. Once you have connected the diagnostic tool to the OBD system, you can read the codes that are stored in the system.

Using Diagnostic Tools

The next step in diagnosing the U0158 code is to use diagnostic tools to identify the cause of the issue. One of the most common causes of the U0158 code is a loss of power or ground to the head-up display module. To check for this issue, you can use a multimeter to test the power and ground connections to the module.

If the power and ground connections are good, you may need to check the wiring and connections between the head-up display module and the other modules in the OBD system. You can use a wiring diagram to identify the connections between the modules and test the wiring for continuity.

Once you have identified the cause of the U0158 code, you can begin the repair process. Depending on the cause of the issue, you may need to replace the head-up display module, repair the wiring or connections, or replace other modules in the OBD system.

In conclusion, diagnosing and repairing the U0158 code on your Harley-Davidson motorcycle requires a few steps, including reading the diagnostic trouble codes and using diagnostic tools to identify the cause of the issue. By following these steps, you can quickly and easily diagnose and repair the U0158 code and get back to riding your motorcycle.

Electrical System Fundamentals

When it comes to Harley Davidson Softail’s electrical system, there are several fundamental components that you should be familiar with. Understanding these components will help you diagnose and fix issues that might arise, including the U0158 code.

Understanding the CAN Network

The CAN (Controller Area Network) is a communication network that allows different modules within your motorcycle to communicate with each other. This network is responsible for transmitting data between modules like the Engine Control Module (ECM), Body Control Module (BCM), and other modules. The U0158 code indicates that there is a problem with the communication between the Head Up Display (HUD) module and other modules on the CAN network.

Battery and Ignition System

The battery and ignition system are two essential components of your Harley Davidson Softail’s electrical system. The battery provides the necessary power to start the motorcycle, while the ignition system is responsible for igniting the fuel in the engine to start the combustion process.

If the battery is not providing enough power to start the motorcycle, it can cause issues with the electrical system. You should always make sure that the battery is fully charged and in good condition. The ignition system can also cause issues if it is not working correctly. If you are experiencing issues with the ignition system, you should check the wiring, inputs, and circuits for any faults.

In conclusion, familiarizing yourself with the electrical system fundamentals of your Harley Davidson Softail can help you diagnose and fix issues that might arise, including the U0158 code. By understanding the CAN network, battery, and ignition system, you can troubleshoot any issues that might occur and keep your motorcycle running smoothly.

Step-by-Step Repair Guide

If you’re experiencing the U0158 code on your Harley, don’t worry. This code is usually caused by a communication error between the head-up display module and the other modules in your bike. Here’s a step-by-step guide to help you resolve this issue.

Resolving U0158

  1. First, check the wiring and connections between the head-up display module and the other modules in your bike. Make sure they are properly connected and not damaged in any way. If you find any damaged wiring or connections, repair or replace them as needed.

  2. If the wiring and connections are fine, try resetting the head-up display module. To do this, turn off the ignition switch and press and hold the reset button on the module for a few seconds. Then, release the button and turn the ignition switch back on.

  3. If resetting the module doesn’t work, you may need to replace it. Consult your bike’s service manual for instructions on how to remove and replace the head-up display module.

Troubleshooting Associated Codes

In some cases, the U0158 code may be accompanied by other codes. Here are some troubleshooting tips for associated codes:

  • U0159: Lost Communication with Fuel Gauge – Check the wiring and connections between the fuel gauge and the other modules in your bike. Make sure they are properly connected and not damaged in any way. If you find any damaged wiring or connections, repair or replace them as needed.

  • U0160: Lost Communication with Fuel and Volt Gauge – Check the wiring and connections between the fuel and volt gauges and the other modules in your bike. Make sure they are properly connected and not damaged in any way. If you find any damaged wiring or connections, repair or replace them as needed.

  • U0184: Lost Communication with Radio – Check the wiring and connections between the radio and the other modules in your bike. Make sure they are properly connected and not damaged in any way. If you find any damaged wiring or connections, repair or replace them as needed.

  • U0199: Lost Communication with ABS/BAS Control Module – Check the wiring and connections between the ABS/BAS control module and the other modules in your bike. Make sure they are properly connected and not damaged in any way. If you find any damaged wiring or connections, repair or replace them as needed.

  • P0605: Internal Control Module ROM Error – This code indicates a problem with the bike’s engine control module. Consult your bike’s service manual for instructions on how to diagnose and repair this issue.

By following these troubleshooting tips, you should be able to resolve the U0158 code and any associated codes on your Harley. If you’re still having trouble, consult a professional mechanic or your bike’s service manual for further assistance.

Preventive Measures and Maintenance

Regular Checks

Regular checks are important to ensure that your Harley Davidson motorcycle is running smoothly and efficiently. One of the things you should check regularly is the battery. You can use a voltmeter to check the battery’s voltage. If the voltage is low, you should recharge the battery or replace it. It is also important to check the ignition system. Make sure that the spark plugs are clean and properly gapped. If the spark plugs are dirty or worn, replace them.

Another important component to check is the BCM or Body Control Module. The BCM controls many of the electrical components on your Harley Davidson. If the BCM is not functioning properly, it can cause problems with the Check Engine light and other electrical systems. Make sure that the BCM is properly connected and that all of the connections are clean and free of corrosion.

Upkeep of Electrical Components

Keeping your Harley Davidson’s electrical components in good condition is essential for preventing problems with the U0158 code. Regular maintenance can help prevent problems with the Head Up Display Module. Make sure that all of the electrical connections are clean and free of corrosion. Check all of the fuses that power up the HUD module on your motorcycle. If you notice any problems with the HUD, such as flickering or a loss of power, have it checked by a qualified mechanic.

Regular maintenance is also important for preventing problems with the Check Engine light. Make sure that you follow the manufacturer’s recommended maintenance schedule. This includes regular oil changes, air filter changes, and other routine maintenance tasks. By keeping your motorcycle in good condition, you can help prevent problems with the U0158 code and other electrical problems.

In conclusion, regular maintenance and checks are important for keeping your Harley Davidson motorcycle running smoothly and efficiently. By keeping your electrical components in good condition and following the manufacturer’s recommended maintenance schedule, you can help prevent problems with the U0158 code and other electrical problems.

Advanced Troubleshooting

If you are still experiencing the U0158 trouble code after attempting basic troubleshooting, it may be time to move on to more advanced methods. The following subsections will provide some guidance on how to deal with persistent codes and when it may be necessary to seek professional help.

Dealing with Persistent Codes

If you have tried all the basic troubleshooting steps and the U0158 code is still present, it may be considered a persistent code. Persistent codes occur when the problem causing the code is still present after multiple attempts to fix it. To deal with persistent codes, you may need to try more advanced methods, such as checking the wiring harness for damage or corrosion, or testing the Head-Up Display (HUD) module.

One thing to keep in mind is that some persistent codes may not actually be caused by the HUD module itself, but rather by other components on the CAN bus. For example, the U0158 code may be caused by a loss of communication with the fuel gauge module, rather than the HUD module. In these cases, it may be necessary to check other modules on the CAN bus to determine the root cause of the problem.

When to Seek Professional Help

If you have tried all the troubleshooting steps and are still unable to resolve the U0158 code, it may be time to seek professional help. A qualified mechanic or technician will have the tools and expertise necessary to diagnose and repair the problem.

It is important to note that some U0158 codes may be caused by more serious issues, such as problems with the ECM or ABS/BAS systems. In these cases, it is highly recommended that you seek professional help, as attempting to repair these systems yourself can be dangerous and may cause further damage.

In addition, if you have recently had your radio flashed or have made any modifications to your bike’s electrical system, it may be necessary to seek professional help to ensure that everything is working correctly. A qualified technician will be able to diagnose any issues and make any necessary repairs or adjustments to ensure that your bike is running smoothly.

Conclusion

Recap of Key Points

In this article, you have learned about the U0158 code, which is a communication error between the Head Up Display (HUD) module and other modules in your Harley-Davidson motorcycle. This code can be caused by a variety of issues, including a faulty HUD module, wiring problems, or a poor electrical connection.

To diagnose the U0158 code, you should begin by checking all fuses that power up the HUD module on your motorcycle. If the fuses are good, you can move on to checking for any loose connections or damaged wiring. If you are unable to find any issues with the wiring or connections, it may be necessary to replace the HUD module.

Final Thoughts on U0158

If you are experiencing the U0158 code in your Harley-Davidson motorcycle, it is important to diagnose and repair the issue as soon as possible. Ignoring this code can lead to further damage to your motorcycle and can even cause safety issues while riding.

While diagnosing and repairing the U0158 code can be challenging, it is important to take your time and follow the proper procedures to ensure that the issue is resolved correctly. If you are unsure about any part of the process, it is always a good idea to consult with a professional mechanic who has experience working on Harley-Davidson motorcycles.

Overall, by following the steps outlined in this article, you should be able to diagnose and repair the U0158 code in your Harley-Davidson motorcycle and get back on the road with confidence.

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