Harley Davidson Throttle By Wire Problems

Have you ever experienced any issues with your Harley Davidson throttle by wire system? Maybe you’ve noticed some strange behavior or an inconsistent response when you twist the throttle. If so, you’re not alone. Many Harley riders have reported problems with their throttle by wire system, and it’s important to understand the potential issues and how to address them.

One common problem with the throttle by wire system is a lag or delay in throttle response. You twist the throttle, but there’s a noticeable delay before the bike responds. This can be frustrating and potentially dangerous, especially when you’re trying to quickly accelerate or maneuver in traffic. In some cases, the lag may be accompanied by a “dead spot” in the throttle, where there’s no response at all.

Another issue that some riders have experienced is a sudden and unexpected loss of power while riding. One moment everything is fine, and the next moment the bike seems to lose power, making it difficult to maintain speed or accelerate. This can be a serious safety concern, especially if it happens while you’re in the middle of traffic or on a busy highway.

In the upcoming article, we’ll delve deeper into these throttle by wire problems and explore the potential causes and solutions. We’ll also discuss the importance of regular maintenance and proper troubleshooting techniques. Knowledge is power, and understanding these common issues can help you stay safe on the road and keep enjoying your Harley Davidson riding experience. Stay tuned for more information on Harley Davidson throttle by wire problems.

Harley Davidson Throttle By Wire Problems


Harley Davidson motorcycles are known for their iconic design and powerful performance. As technology advances, many motorcycles, including Harley Davidsons, have adopted throttle-by-wire systems. This innovative technology replaces traditional throttle cables with electronic sensors and actuators, providing a smoother and more precise throttle response. However, like any advanced system, throttle-by-wire can encounter problems. In this article, we will explore the common issues faced by Harley Davidson motorcycles with throttle-by-wire systems, their possible causes, symptoms, troubleshooting, preventive measures, support and assistance options, recalls and safety campaigns, legal considerations, and the importance of addressing these problems promptly for the safety and optimal performance of your Harley Davidson motorcycle.

Common Throttle-By-Wire Issues

Intermittent loss of throttle response

One of the common problems faced by Harley Davidson motorcycles with throttle-by-wire systems is intermittent loss of throttle response. This issue often occurs when the connection between the throttle sensor and the electronic control module (ECM) is disrupted. It can lead to sudden power loss, making it difficult to maintain control over the motorcycle.

Unresponsive throttle at low speeds

Another issue riders may experience is an unresponsive throttle at low speeds. This can be frustrating and dangerous, especially in stop-and-go traffic or when maneuvering through tight turns. The unresponsive throttle can make it difficult to accelerate smoothly, resulting in jerky movements and potential accidents.

Sudden acceleration or deceleration

Sudden and unexpected acceleration or deceleration is another problem associated with throttle-by-wire systems. This issue can be hazardous, as it can catch riders off guard, potentially causing loss of control and accidents. This sudden change in throttle response is often caused by faulty sensors or ECM malfunction.

Possible Causes

Faulty sensors

One of the primary causes of throttle-by-wire problems is faulty sensors. These sensors measure the position of the throttle and send signals to the ECM, which then adjusts the engine’s fuel injection and ignition timing. If the throttle position sensor (TPS) or other related sensors are malfunctioning, they can send incorrect signals to the ECM, resulting in erratic throttle response.

Wiring issues

Throttle-by-wire systems heavily rely on proper wiring connections to ensure accurate communication between the sensors and the ECM. Wiring issues such as loose or damaged connections, corrosion, or frayed wires can disrupt this communication, leading to various throttle-related problems.

Electronic control module (ECM) malfunction

The ECM acts as the brain of the throttle-by-wire system, interpreting the signals from the sensors and controlling the engine’s performance accordingly. If the ECM malfunctions or develops software glitches, it can cause erratic throttle response, loss of throttle control, or other performance issues.

Symptoms of Throttle-By-Wire Problems

Engine misfires

Throttle-by-wire problems can manifest as engine misfires. This refers to the engine running unevenly or hesitating during acceleration. Misfires can occur due to incorrect adjustments made by the ECM based on faulty throttle sensor signals.

Difficulty starting the motorcycle

Throttle-by-wire issues can also make it challenging to start the motorcycle. Starting problems may occur due to incorrect fuel or air mixture caused by faulty throttle sensor signals or ECM malfunction.

Reduced fuel efficiency

Another symptom of throttle-by-wire problems is reduced fuel efficiency. When the throttle-by-wire system is not functioning correctly, it can negatively impact the engine’s fuel injection and ignition timing, resulting in increased fuel consumption and decreased mileage.

Harley Davidson Throttle By Wire Problems

Troubleshooting Throttle-By-Wire Problems

Check for fault codes

When faced with throttle-by-wire problems, it is crucial to check for any fault codes using a diagnostic tool specifically designed for Harley Davidson motorcycles. These codes can provide valuable information about the specific issue or sensor malfunction, helping you pinpoint the source of the problem.

Inspect throttle cables and connectors

Inspecting the throttle cables and connectors is essential as loose connections or worn-out cables can cause throttle-by-wire problems. Check for any signs of damage, corrosion, or fraying. If necessary, tighten or replace the cables and connectors accordingly.

Test sensors and wiring

Testing the throttle sensors and wiring is an essential step in troubleshooting throttle-by-wire problems. Use a multimeter or other appropriate testing tools to check the resistance and voltage of the sensors. Additionally, inspect the wiring for any signs of damage or loose connections. If any issues are detected, replace the faulty sensors or repair the wiring as needed.

Preventive Measures

Regular maintenance and inspections

To minimize the likelihood of experiencing throttle-by-wire problems, it is essential to conduct regular maintenance and inspections of your Harley Davidson motorcycle. Follow the manufacturer’s recommended maintenance schedule, which may include checking and cleaning throttle components, inspecting wiring, and ensuring proper sensor operation.

Cleaning and lubrication of throttle components

Regularly cleaning and lubricating the throttle components can help prevent dirt, debris, or rust from interfering with the throttle-by-wire system’s operation. Use recommended cleaning agents and lubricants to ensure optimal performance and longevity of your motorcycle’s throttle system.

Avoiding aftermarket modifications

While it may be tempting to modify your Harley Davidson motorcycle with aftermarket parts or accessories, it is crucial to exercise caution. Poorly designed or incompatible modifications can disrupt the throttle-by-wire system, leading to various problems. Stick to genuine Harley Davidson parts or consult with authorized dealerships for appropriate modifications.

Support and Assistance

Contact authorized Harley-Davidson dealerships

If you encounter persistent throttle-by-wire problems, it is recommended to seek assistance from authorized Harley-Davidson dealerships. These experts have the necessary knowledge and equipment to diagnose and repair throttle-related issues effectively.

Consult motorcycle repair professionals

In addition to authorized dealerships, consulting independent motorcycle repair professionals who specialize in Harley Davidson motorcycles can also provide valuable insight and assistance. These professionals often have extensive experience dealing with throttle-by-wire systems and can offer alternative perspectives and solutions.

Online forums and communities

Online forums and communities dedicated to Harley Davidson motorcycles can serve as a valuable resource for support and assistance when facing throttle-by-wire problems. Engage with fellow riders and enthusiasts who have experienced similar issues, and learn from their experiences and suggestions for troubleshooting and resolving the problems you may encounter.

Recalls and Safety Campaigns

Importance of staying updated with recall information

Given the critical role of the throttle-by-wire system in motorcycle performance and safety, it is essential to stay informed about any recalls or safety campaigns related to your specific Harley Davidson model. Regularly check the manufacturer’s official website or subscribe to notifications to receive updates about potential issues and necessary measures to address them.

Reporting throttle-related issues

If you believe that your Harley Davidson motorcycle has encountered throttle-by-wire problems that may pose a safety risk, it is crucial to report the issue to the manufacturer or relevant authorities. By reporting such issues, you can contribute to a more comprehensive understanding of the problem and facilitate potential recalls or safety campaigns.

Participating in safety campaigns

If a safety campaign or recall related to throttle-by-wire problems is initiated by the manufacturer, it is essential to actively participate and follow the recommended actions. Safety campaigns are designed to address known issues and ensure the optimal performance and safety of your motorcycle.

Legal Considerations

Product liability laws

Product liability laws protect consumers from defective products and hold manufacturers accountable for any harm caused by their products. If throttle-by-wire problems result from manufacturing defects or design flaws, you may have legal rights to pursue compensation for any damages or injuries incurred.

Consumer rights and warranties

As a consumer, you have certain rights and protections under consumer protection laws. Familiarize yourself with these rights, as they may entitle you to remedies such as repairs, replacements, or refunds for throttle-by-wire problems covered under warranties or implied warranties of merchantability.

Legal actions against manufacturers

In extreme cases where throttle-by-wire problems lead to severe injuries or damages, legal actions against the manufacturers may be necessary. Consult with a qualified attorney specializing in product liability or personal injury to evaluate your options, gather evidence, and navigate the legal process.


Addressing throttle-by-wire problems promptly is crucial for ensuring the safety and optimal performance of your Harley Davidson motorcycle. Regular maintenance, inspections, and awareness of potential issues are essential in preventing and identifying throttle-related problems. In case of persistent issues, seek professional help from authorized dealerships or independent motorcycle repair professionals. Stay updated with recall information, report any throttle-related issues, and participate in safety campaigns to contribute to a safer riding experience. Understanding your legal rights and options is crucial, as legal actions may be necessary in certain circumstances. By taking proactive measures and seeking appropriate assistance, you can enjoy the thrill of riding your Harley Davidson motorcycle without compromising safety and performance.

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