If you own a Harley Davidson motorcycle, you may encounter trouble with your bike and receive a trouble code on your dashboard. One of the codes you may see is U1401. This code indicates that there is a communication problem between the bike’s control module and the CB radio.

When you see the U1401 code, it is important to take action to fix the issue. Ignoring the problem can lead to further damage to your motorcycle. The cost of repairing the U1401 code will depend on the hourly rate charged by the auto repair shop, which typically ranges between $75 and $150 per hour. However, it is best to consult with a professional mechanic to determine the exact cause of the problem and the cost of repair.

If you are experiencing the U1401 code on your Harley Davidson, you may be wondering what it means and how to fix the issue. In this article, we will discuss the causes of the U1401 code, the symptoms you may experience, and the steps you can take to fix the problem. By understanding the U1401 code and taking the necessary steps to fix it, you can ensure that your Harley Davidson is running smoothly and avoid any further damage to your motorcycle.

Understanding Harley Code U1401

If you have a Harley-Davidson motorcycle and your check engine light has come on, it could be due to a variety of reasons, including trouble codes (DTC). One of the most common trouble codes that you might encounter is U1401.

U1401 is an engine speed signal code that can be diagnosed and fixed within an estimated repair time of 1.0 hour. The cost of repair is influenced by the hourly rate charged by the auto repair shop, which typically ranges between $75 and $150 per hour. Therefore, the total cost of diagnosing and fixing the U1401 fault code will depend on the hourly rate.

The U1401 code usually indicates a problem with the Engine Control Module (ECM) or the Controller Area Network (CAN) bus. The ECM is responsible for managing the engine’s performance, while the CAN bus is a communication network that connects all the electronic modules in the motorcycle.

To diagnose the U1401 code, you will need to use a diagnostic tool that can read the DTCs stored in the ECM. Once you have identified the U1401 code, you can begin to troubleshoot the problem. Some common causes of the U1401 code include faulty wiring, a malfunctioning ECM, or a problem with the CAN bus.

If you are not comfortable diagnosing and fixing the U1401 code yourself, it is best to take your motorcycle to a certified Harley-Davidson technician. They will have the expertise and tools necessary to diagnose and repair the problem quickly and efficiently.

In summary, the U1401 code is a common trouble code that can be caused by a variety of issues related to the ECM and CAN bus. If you encounter this code, it is best to have it diagnosed and repaired by a certified technician to ensure the optimal performance of your Harley-Davidson motorcycle.

Common Symptoms of Code U1401

If you are experiencing code U1401 on your Harley-Davidson motorcycle, there are a few common symptoms you may notice. These symptoms are usually related to the communication between the different modules of your bike, and they can vary depending on the specific model and year of your motorcycle.

Here are some of the most common symptoms of code U1401:

• Engine Light ON: One of the most noticeable symptoms of code U1401 is the illumination of the engine light on your dashboard. This warning light indicates that there is a problem with your bike’s engine or its related systems. If you notice this warning light, you should take your motorcycle to a professional mechanic to have it diagnosed and repaired.

• Service Engine Soon Warning Light ON: Another common symptom of code U1401 is the illumination of the service engine soon warning light on your dashboard. This warning light indicates that there is a problem with one or more of your bike’s systems, and it is usually accompanied by a specific diagnostic trouble code (DTC). If you see this warning light, you should take your bike to a Harley-Davidson service center to have it checked.

• Lost Communication with Control Module: Code U1401 is usually caused by a communication problem between the different control modules of your Harley-Davidson motorcycle. This can lead to a loss of communication between the modules, which can affect the performance and safety of your bike. If you notice any issues with your bike’s control or communication systems, you should have it checked by a professional mechanic.

• Other Symptoms: In some cases, code U1401 can also cause other symptoms such as problems with the ABS, speedometer, radio, instruments, and other systems. These symptoms can vary depending on the specific model and year of your motorcycle, and they may require different diagnostic and repair procedures.

Overall, if you are experiencing code U1401 on your Harley-Davidson motorcycle, it is important to have it diagnosed and repaired as soon as possible to ensure the safety and reliability of your bike. By taking your bike to a professional mechanic, you can get the proper diagnosis and repair procedures to fix the problem and get back on the road safely.

Diagnosing the U1401 Trouble Code

If your Harley-Davidson motorcycle is displaying the U1401 trouble code, it means that the engine speed signal received by the ECM is implausible. This can be caused by a range of issues, including a faulty communication link between the ECM and the CB, a malfunctioning CB, or a wiring issue.

To diagnose the U1401 trouble code, you will need to use a diagnostic tool that is compatible with your Harley-Davidson motorcycle’s onboard diagnostic system (OBD). This tool will allow you to read the diagnostic trouble codes (DTCs) stored in the ECM and perform a range of diagnostic tests to pinpoint the cause of the issue.

Here are a few steps you can take to diagnose the U1401 trouble code:

1. Connect your diagnostic tool to the OBD port on your Harley-Davidson motorcycle and turn the ignition on.

2. Use the diagnostic tool to read the DTCs stored in the ECM. If the U1401 trouble code is present, note it down.

3. Check the wiring between the ECM and the CB for any signs of damage or wear. If you find any issues, repair or replace the wiring as necessary.

4. Check the CB for any signs of damage or malfunction. If you find any issues, replace the CB.

5. Use the diagnostic tool to perform a range of diagnostic tests on the communication link between the ECM and the CB. This will help you to determine if there are any issues with the link that need to be addressed.

By following these steps, you should be able to diagnose the U1401 trouble code on your Harley-Davidson motorcycle and determine the underlying cause of the issue. If you are unsure about any of these steps or need further assistance, it is recommended that you seek the help of a qualified technician.

Troubleshooting Electrical Components

When dealing with the U1401 code on your Harley-Davidson, it’s important to check the electrical components of your motorcycle. In this section, we’ll cover the battery and charging system, as well as the ignition switch and system.

Battery and Charging System

The battery is an essential component of your Harley-Davidson motorcycle. It provides power to start the engine and also powers the electrical components of your bike. If your battery is weak or not holding a charge, it can cause the U1401 code to appear.

To troubleshoot your battery and charging system, you should perform the following steps:

• Check the battery voltage: A low battery voltage can cause BCM problems. Check the battery voltage and make sure it’s at least 12.5 volts.
• Check the charging system: Start the engine and record the battery voltage on your multimeter. The voltage should be near 14 volts. Raise the engine RPM’s to 2,000 and turn on all your motorcycle’s electrical accessories, such as lights, radio, etc. The voltage may drop, but should remain near 14 volts during the test.
• Check the connections: Check the connections to the battery and make sure they’re clean and tight.

Ignition Switch and System

The ignition switch and system are responsible for starting your Harley-Davidson motorcycle. If there is a problem with the ignition switch or system, it can cause the U1401 code to appear.

To troubleshoot your ignition switch and system, you should perform the following steps:

• Check the run/stop switch: Make sure the run/stop switch is in the “run” position.
• Check the ignition switch: Turn the ignition switch to the “on” position and make sure the lights on your motorcycle turn on. If they don’t, the ignition switch may be faulty.
• Check the RAD, LHCM, and RHCM: These components are responsible for communicating with the BCM. If there is a problem with any of these components, it can cause the U1401 code to appear.

By following these troubleshooting steps, you can diagnose and fix the U1401 code on your Harley-Davidson motorcycle.

Harley-Davidson Specific Diagnostics

When it comes to diagnosing issues with your Harley-Davidson motorcycle, it’s important to understand the specific diagnostic codes that can appear on your bike’s onboard computer. One of the most common codes that riders encounter is the U0141H code, which indicates a communication issue with the LHCM (Left Hand Control Module). However, another code that you may encounter is the U1401 code, which can indicate a variety of different issues.

ECM and CAN Bus System

The U1401 code is related to the ECM (Engine Control Module) and the CAN (Controller Area Network) bus system. The ECM is responsible for controlling various functions of your bike, including the fuel injection system, ignition system, and more. The CAN bus system is a network of communication lines that allows different modules on your bike to communicate with each other.

If you encounter the U1401 code, it could indicate a variety of different issues with the ECM or the CAN bus system. For example, it could indicate a faulty ECM, a wiring issue, or a problem with the bike’s onboard computer. To diagnose the issue, you may need to use a diagnostic tool to read the specific code and determine the root cause of the problem.

TGS and Control Switch Issues

Another potential cause of the U1401 code is a problem with the TGS (Throttle Grip Sensor) or the control switches on your bike. The TGS is responsible for sending signals to the ECM to control the throttle, while the control switches allow you to adjust various settings on your bike.

If you encounter the U1401 code, it’s possible that there is a problem with the TGS or one of the control switches. This could be due to a wiring issue or a faulty component. To diagnose the issue, you may need to inspect the wiring and components to determine the root cause of the problem.

Overall, if you encounter the U1401 code on your Harley-Davidson motorcycle, it’s important to diagnose the issue as soon as possible to prevent further damage to your bike. By understanding the specific diagnostic codes and the potential causes of the U1401 code, you can take the necessary steps to resolve the issue and get back on the road with confidence.

Repair and Replacement Procedures

If you have received the U1401 trouble code on your Harley-Davidson motorcycle, it is important to take the necessary steps to repair or replace the affected component. Here are some procedures that you can follow to fix the issue:

Step 1: Check the ECM

The first step in fixing the U1401 trouble code is to check the Engine Control Module (ECM) for any faults or issues. You can do this by using a diagnostic scanner tool that can read the trouble codes stored in the system. If the ECM is found to be faulty, you will need to replace it with a new one.

Step 2: Check the CAN Bus

The Controller Area Network (CAN) Bus is responsible for transmitting data between the various modules in your motorcycle. If there is an issue with the CAN Bus, it can cause the U1401 trouble code to appear. Check the wiring and connections of the CAN Bus to ensure that they are secure and free from any damage.

Step 3: Check the Ignition Switch

The ignition switch is another component that can cause the U1401 trouble code to appear. Check the switch for any signs of damage or wear and tear. If necessary, replace the ignition switch with a new one.

Step 4: Check the RAD and BCM

The Radio (RAD) and Body Control Module (BCM) are two other components that can cause the U1401 trouble code to appear. Check these modules for any faults or damage. If necessary, replace them with new ones.

By following these procedures, you can effectively repair or replace the components that are causing the U1401 trouble code to appear on your Harley-Davidson motorcycle. It is important to take the necessary steps to fix the issue as soon as possible to ensure that your motorcycle is running smoothly and safely.

Preventive Maintenance and Best Practices

To ensure your Harley-Davidson motorcycle is running smoothly, it is important to follow some preventive maintenance and best practices. Here are some tips to help you keep your bike in top condition:

• Regular Maintenance: Regular maintenance is crucial to keep your Harley running at its best. Follow the maintenance schedule recommended by the manufacturer, which includes oil changes, tire pressure checks, and other routine maintenance tasks. Regular maintenance can help prevent issues with the battery, ignition, and other components.

• Battery Care: The battery is an essential component of your Harley-Davidson motorcycle. To keep it in good condition, make sure to check the battery terminals for corrosion and clean them if necessary. You should also check the battery voltage regularly and charge it when necessary. If you plan to store your bike for an extended period, it is recommended to remove the battery and store it in a cool, dry place.

• Ignition System: The ignition system is responsible for starting your motorcycle. To ensure it is working correctly, check the spark plugs regularly and replace them if necessary. You should also check the ignition timing and adjust it if needed.

• Run/Stop Switch: The run/stop switch is an essential safety feature of your Harley-Davidson motorcycle. Make sure to check it regularly and replace it if it is not working correctly. You should also check the wiring and connections to ensure they are secure.

• Best Practices: In addition to regular maintenance, there are some best practices that you can follow to keep your Harley-Davidson motorcycle in top condition. These include storing your bike in a dry, cool place, using high-quality fuel and oil, and avoiding harsh riding conditions.

By following these preventive maintenance and best practices, you can help prevent issues with your Harley-Davidson motorcycle. Regular maintenance and care can help ensure that your bike runs smoothly and reliably for years to come.

Understanding Harley-Davidson Error Codes

Harley-Davidson motorcycles are equipped with an onboard diagnostic system that monitors the engine and various other systems for faults. When a fault is detected, the system stores a trouble code in its memory, which can be retrieved using a diagnostic scanner or by following a specific procedure. These trouble codes are also known as DTCs or Diagnostic Trouble Codes.

Harley-Davidson error codes are categorized into different groups, depending on the system that is affected. Some of the most common trouble codes include P0031, P0032, P0051, P0052, P0072, P0073, P0107, P0108, P0112, P0113, P0117, P0118, P0120, P0122, P0123, P0131, P0132, P0134, P0151, P0152, P0154, P0220, P0222, P0223, P0261, P0262, P0264, P0265, P0371, P0374, P0444, P0445, P0502, P0503, P0505, P0572, P0577, P0603, P0605, P0641, P0651, P1009, P1017, P1019, P1270, P1501, P1502, P1511, P1512, and B1103.

To retrieve the trouble codes, you need to follow a specific procedure, which may vary depending on the model and year of your Harley-Davidson motorcycle. Once you have retrieved the codes, you can use a reference guide to determine the cause of the fault and take appropriate action.

It is important to note that not all trouble codes require immediate attention, and some may be false alarms. However, it is always a good idea to address any trouble codes as soon as possible to prevent further damage to your motorcycle.

In summary, understanding Harley-Davidson error codes is essential for maintaining the health of your motorcycle. By following the correct procedure to retrieve the codes and using a reference guide to determine the cause of the fault, you can take appropriate action to keep your motorcycle running smoothly.