Harley Code U0002: Understanding the Diagnostic Trouble Code

If you own a Harley-Davidson motorcycle, you may have encountered an error code U0002. This code indicates a problem with the High Speed CAN Communication Bus Performance. The Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. When a supervised periodic message is not received, the U0002 fault code is set.

The U0002 code can be caused by a variety of issues, including a faulty module or wiring, a malfunctioning battery, or a loose connection. If you see this code on your Harley’s display, it’s important to address the issue as soon as possible. Continuing to ride with this code present can result in further damage to your motorcycle.

Fortunately, there are steps you can take to fix the U0002 code. One option is to check the wiring and connections to ensure they are secure. You can also try resetting the code by disconnecting the battery for a few minutes. If neither of these solutions work, it’s best to take your motorcycle to a qualified technician who can diagnose and repair the issue.

Understanding Harley Code U0002

Basics of DTC

DTC stands for Diagnostic Trouble Code, which is a code that the Engine Control Module (ECM) generates when it detects a problem in the system. The U0002 code is related to the High-Speed Controller Area Network (CAN) Communication Bus Performance. It indicates that a supervised periodic message is not received.

Implications for ABS System

The U0002 code has implications for the Anti-Lock Braking System (ABS). When this code appears, it means that the ABS system is not functioning correctly. The BCM (Body Control Module) sends a message to the ECM via the CAN bus, and if the ECM does not receive this message, it generates the U0002 code.

The ABS system is an essential safety feature on your Harley-Davidson motorcycle. It prevents the wheels from locking up during hard braking, which can cause the bike to skid and lose control. If the ABS system is not functioning correctly, it can compromise your safety while riding.

If you see the U0002 code on your Harley-Davidson, you should take it to a qualified technician for diagnosis and repair. They will use a diagnostic tool to read the code and determine the cause of the problem. It could be a wiring issue, a faulty ABS sensor, or a problem with the ABS module itself.

In conclusion, the U0002 code is a DTC that indicates a problem with the High-Speed CAN Communication Bus Performance. It has implications for the ABS system, which is an essential safety feature on your Harley-Davidson motorcycle. If you see this code, you should take your bike to a qualified technician for diagnosis and repair.

Electrical Components and U0002

If you are experiencing the U0002 code on your Harley, it is likely that you are dealing with an electrical issue. In this section, we will discuss the various electrical components that may be causing the U0002 code and how to troubleshoot them.

Battery and Charging System

One of the most common causes of the U0002 code is a weak or failing battery. If your battery is not providing enough voltage to the system, it can cause communication errors between the various modules in your Harley. To check your battery, you can use a multimeter to measure the voltage. A healthy battery should read around 12.6 volts when fully charged.

If your battery is not the issue, you may want to check your charging system. A faulty voltage regulator or stator can cause your battery to not charge properly, leading to low voltage issues. You can test your charging system by measuring the voltage across the battery terminals with the engine running. A healthy charging system should read around 14 volts.

ECM and BCM Connections

Another common cause of the U0002 code is poor connections between the ECM and BCM modules. The ECM and BCM are responsible for communicating with each other and other modules in your Harley. If the connections between these modules are loose or corroded, it can cause communication errors.

To check the connections, you will need to locate the ECM and BCM modules. They are typically located under the seat or in the battery compartment. Once you have located the modules, you can check the connections for any signs of corrosion or looseness. If you find any issues, you can clean the connections with a wire brush or replace any damaged connectors.

In addition to the battery and charging system, the ABS voltage low and ABS voltage high can also cause the U0002 code. It is important to check all of these components when troubleshooting the U0002 code to ensure that you identify the root cause of the problem.

ABS Specific Issues

If you are experiencing the U0002 code on your Harley, you may be experiencing ABS specific issues. These issues can be caused by a variety of factors, including wheel speed sensor faults, ABS pump and motor errors, and other related issues.

Wheel Speed Sensor Faults

One of the most common ABS specific issues that can trigger the U0002 code is a wheel speed sensor fault. This can occur when the sensor fails to detect the correct wheel speed, which can lead to issues with the ABS system. If you are experiencing this issue, you may notice that your ABS light is illuminated, or that your brakes are not functioning properly.

ABS Pump and Motor Errors

Another common ABS specific issue that can trigger the U0002 code is an ABS pump or motor error. This can occur when there is an issue with the pump or motor that powers the ABS system. If you are experiencing this issue, you may notice that your ABS light is illuminated, or that your brakes are not functioning properly.

It is important to note that there are other ABS specific issues that can trigger the U0002 code, including ABS ECU relay error, ABS wheel speed difference too high, ABS ECU internal error, and other related issues. If you are experiencing any of these issues, it is important to have your Harley inspected by a qualified technician to determine the root cause of the problem.

In conclusion, if you are experiencing the U0002 code on your Harley, you may be experiencing ABS specific issues. These issues can be caused by a variety of factors, including wheel speed sensor faults, ABS pump and motor errors, and other related issues. If you are experiencing any of these issues, it is important to have your Harley inspected by a qualified technician to determine the root cause of the problem.

Solenoid and Sensor Malfunctions

If you are experiencing the U0002 code on your Harley-Davidson, it could be due to solenoid and sensor malfunctions. Here are some of the issues that could be causing the problem.

Front and Rear Solenoid Circuits

If the ABS front apply solenoid circuit is open or has high resistance, it can cause the ABS fault and trigger the U0002 code. The same goes for the ABS rear apply solenoid circuit. In such cases, you should see a dealer for repair.

MAP and CKP Sensor Issues

A failed MAP sensor with a high or open port can cause the check engine light to come on and trigger the U0002 code. Similarly, if the CKP sensor has the wrong number of pulses, it can also cause the U0002 code to appear.

To diagnose these issues, you should check the vehicle’s symptoms and look for other codes that may be present. It is essential to get these issues fixed as soon as possible to avoid further damage to your motorcycle.

In conclusion, if you are experiencing the U0002 code on your Harley-Davidson, it could be due to solenoid and sensor malfunctions. By understanding the potential issues, you can take the necessary steps to fix the problem and get back on the road.

Output Circuit Problems

If you’re experiencing the U0002 code on your Harley, it could be related to output circuit problems. This section will discuss some of the issues you may encounter with these circuits and how to address them.

Accessory and H2 Outputs

One potential issue with the output circuits on your Harley is an ACC output shorted high or an H2 output shorted low. These faults can be caused by a variety of factors, including problems with the wiring or the accessory itself.

To address these issues, you should start by checking the wiring to ensure that it is properly connected and not damaged. If the wiring appears to be in good condition, you may need to replace the accessory or have it repaired by a professional.

Brake Lamp and Security Antenna Outputs

Another potential issue with the output circuits on your Harley is a brake lamp output open or a security antenna output shorted low. These faults can be caused by problems with the wiring or the component itself.

It’s important to note that these are just a few of the potential issues you may encounter with the output circuits on your Harley. If you’re experiencing the U0002 code, it’s always best to consult the owner’s manual or seek the assistance of a professional mechanic.

Control Modules and Error Codes

If you own a Harley-Davidson motorcycle, you may come across error codes that indicate an issue with the control modules. LHCM and RHCM are two of the most common control modules that can cause problems with your bike.

LHCM and RHCM Issues

LHCM stands for Left Hand Control Module, while RHCM stands for Right Hand Control Module. These control modules are responsible for managing different functions of your motorcycle, including the lights, horn, turn signals, and cruise control.

If you encounter issues with LHCM or RHCM, your motorcycle may not function properly. For instance, you may find that your turn signals are not working, or your horn is not sounding. In some cases, your motorcycle may not start at all.

Troubleshooting Trouble Codes

If you see an error code on your Harley-Davidson motorcycle, it may be related to the control modules. One of the most common error codes is U0002, which indicates a problem with the CAN communication bus performance.

To troubleshoot this error code, you should start by checking your LHCM and RHCM. Look for any signs of damage or wear and tear. You should also check the wiring and connectors to ensure that they are properly connected.

If you are unable to resolve the issue on your own, it’s best to take your motorcycle to a professional mechanic. They can run diagnostic tests to identify the problem and make the necessary repairs.

In conclusion, control modules and error codes are an essential part of your Harley-Davidson motorcycle. By understanding how these components work and how to troubleshoot issues, you can keep your bike running smoothly for years to come.

Vehicle Systems and Switches

Harley-Davidson motorcycles come equipped with various systems and switches that are crucial for their proper functioning. In this section, we will discuss the ignition and run/stop switches, as well as the clutch and neutral switches.

Ignition and Run/Stop Switches

The ignition switch is used to turn the motorcycle on and off. It is located on the right-hand side of the handlebar and is usually labeled with the word “ignition.” When you turn the key to the “on” position, the motorcycle’s electrical system is activated, allowing it to start.

The run/stop switch, also located on the right-hand side of the handlebar, is used to turn the motorcycle’s engine on and off. When the switch is in the “run” position, the motorcycle’s engine can be started. When it is in the “stop” position, the engine is turned off.

Clutch and Neutral Switches

The clutch switch is located on the left-hand side of the handlebar and is used to engage and disengage the motorcycle’s clutch. When you pull the clutch lever, the switch is activated, allowing you to shift gears. When you release the clutch lever, the switch is deactivated, and the motorcycle is in gear.

The neutral switch is also located on the left-hand side of the handlebar and is used to indicate when the motorcycle is in neutral. When the motorcycle is in neutral, the neutral light on the dashboard will be illuminated. This switch is important because it prevents the motorcycle from starting while in gear.

It is important to ensure that all of these switches are functioning properly, as a malfunctioning switch can cause various problems, including the U0002 code. If you suspect that a switch is malfunctioning, it is recommended that you take your motorcycle to a certified Harley-Davidson dealer for diagnosis and repair.

Overall, the proper functioning of these switches is crucial for the safe and efficient operation of your Harley-Davidson motorcycle.

Service and Maintenance

If you’re experiencing the U0002 code on your Harley-Davidson motorcycle, it’s important to take it to an authorized dealer for service as soon as possible. Continuing to ride your motorcycle with this code could result in further damage to your electrical system and other components.

Regular maintenance is also crucial in preventing issues like U0002 from occurring. Make sure to follow the maintenance schedule outlined in your owner’s manual and have your motorcycle serviced by a qualified technician.

Additionally, keeping track of your odometer readings can help you stay on top of necessary maintenance tasks. Many Harley-Davidson models have maintenance reminders that will display on your instrument cluster when it’s time for service.

If you’re experiencing intermittent issues with your ABS front or rear wheel speed, it’s important to have those components checked as well. These issues could be related to the U0002 code and could potentially affect the safety of your ride.

Overall, taking care of your Harley-Davidson motorcycle with regular service and maintenance can help prevent issues like U0002 from occurring and keep you safe on the road.