If you own a Harley-Davidson motorcycle, chances are you’ve encountered a check engine light at some point. One of the most common codes that riders experience is code P2135. This code is related to the throttle position sensor and can cause a variety of issues with your bike’s performance.
When your Harley-Davidson’s engine control module detects a problem with the throttle position sensor, it triggers code P2135. This code indicates that there is a voltage correlation issue between the throttle position sensor and the accelerator pedal position sensor. This can result in a range of problems, including reduced power, poor acceleration, and stalling. If you’re experiencing any of these symptoms, it’s important to get your bike checked out as soon as possible to prevent further damage.
There are a number of potential causes for code P2135, including issues with the throttle body or the wiring harness. It’s important to have a qualified technician diagnose and repair the problem to ensure that your bike is running smoothly and safely. In the next section, we’ll take a closer look at some of the common causes of code P2135 and what you can do to fix the problem.
Understanding Code P2135
Defining P2135
If you own a Harley Davidson motorcycle and have encountered the P2135 code, you might be wondering what it means. In simple terms, the P2135 code indicates that there is a problem with the throttle position sensor (TPS) and accelerator pedal position sensor (APP) correlation. This means that the voltage readings from these two sensors do not match up, which can lead to issues with your motorcycle’s performance.
Causes of P2135 Code
There are several reasons why you might encounter the P2135 code on your Harley Davidson motorcycle. Some of the most common causes include a faulty TPS, a faulty APP sensor, or a wiring issue between the two sensors. In some cases, the problem may be related to the throttle body or the electronic control module (ECM).
If you suspect that the issue is with the TPS or the APP sensor, you can test these components using a multimeter. Simply check the voltage readings from each sensor and compare them to the specifications listed in your motorcycle’s service manual. If the readings do not match up, you may need to replace one or both of these sensors.
If the problem is related to the throttle body or the ECM, you may need to replace these components to fully resolve the issue. Overall, fixing the P2135 code is a relatively simple process that can be completed with basic tools and a little bit of know-how.
In conclusion, the P2135 code on your Harley Davidson motorcycle can be caused by a number of different issues. By understanding the causes of this code and testing the relevant components, you can quickly and easily resolve the issue and get back to enjoying your ride.
Symptoms of Code P2135
If you’re experiencing trouble with your Harley and have received a P2135 code, it’s important to understand the symptoms that come with it. This code is related to the throttle position sensor and accelerator pedal position sensor, and can cause a variety of issues with your motorcycle’s performance.
Check Engine Light and Limp Mode
The most obvious symptom of a P2135 code is the check engine light turning on. This is your motorcycle’s way of telling you that something is wrong and needs to be addressed. In addition to the check engine light, you may also experience your motorcycle going into limp mode. Limp mode is a safety feature that limits your motorcycle’s power and speed to prevent further damage.
Acceleration Issues
Another common symptom of a P2135 code is difficulty accelerating. You may notice that your motorcycle is hesitant to accelerate or that it stalls when you try to give it more throttle. In some cases, you may also experience reduced engine power. This can make it difficult to ride your motorcycle and can be dangerous in certain situations.
If you’re experiencing any of these symptoms, it’s important to take your motorcycle to a Harley-Davidson dealer or a qualified mechanic as soon as possible. They will be able to diagnose the issue and make any necessary repairs to get your motorcycle running smoothly again.
Diagnosing the Problem
If your Harley is displaying the P2135 code, it means that there is a problem with the Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation. Here are some steps you can take to diagnose the problem:
Using a Scan Tool
The first step in diagnosing the P2135 code is to use a scan tool to read the freeze frame data and any other related codes. This will help you identify the specific problem that is causing the P2135 code.
Once you have identified the problem, you can use the scan tool to clear the code and see if it returns. If it does, you will need to continue with the diagnosis process.
Checking Electrical Connections
One common cause of the P2135 code is a problem with the electrical connections. To check the connections, you will need to use a multimeter to test the voltage at various points in the system.
Start by checking the voltage at the Throttle/Pedal Position Sensor/Switch A/B. If the voltage is not within the specified range, you may need to replace the sensor.
Next, check the wiring and connectors for any signs of damage or corrosion. If you find any issues, you will need to repair or replace the affected components.
By following these steps, you should be able to diagnose the problem that is causing the P2135 code on your Harley. Remember to always use caution when working with electrical components, and consult a professional mechanic if you are unsure about any aspect of the diagnosis process.
Common Repair Steps
If you’re experiencing code P2135 on your Harley, there are a few common repair steps you can take to address the issue. These steps include repairing or replacing components and addressing wiring and connector issues.
Repairing or Replacing Components
One of the most common causes of code P2135 is a faulty throttle position sensor or accelerator pedal position sensor. If either of these sensors is malfunctioning, it can cause the code to appear. To repair or replace these components, you’ll need to follow the instructions in your Harley’s service manual.
Another component that can cause code P2135 is the engine control module (ECM). If the ECM is faulty, it can trigger the code. In this case, you’ll need to replace the ECM to resolve the issue.
Addressing Wiring and Connector Issues
In some cases, code P2135 can be caused by damaged wiring or corrosion on the terminals. To address these issues, you’ll need to inspect the wiring and connectors for any signs of damage or corrosion. If you find any issues, you’ll need to repair or replace the affected wiring or connectors.
Fretting is another issue that can cause code P2135. Fretting occurs when the connector terminals become loose and start to move around, causing the connector to fail. To address fretting, you’ll need to inspect the connector for any signs of movement and replace the connector if necessary.
In conclusion, if you’re experiencing code P2135 on your Harley, there are a few common repair steps you can take to address the issue. By repairing or replacing components and addressing wiring and connector issues, you can resolve the issue and get back on the road.
Technical Service Bulletins and Recalls
Importance of TSBs
Technical Service Bulletins (TSBs) are documents released by Harley-Davidson that provide information about known issues with their motorcycles. TSBs are not recalls, but they do provide important information that can help you diagnose and fix problems with your bike. TSBs are usually released when a problem is found that is not serious enough to warrant a recall, but that still needs to be addressed.
If you are experiencing trouble with your Harley-Davidson motorcycle, it is always a good idea to check for any TSBs that may be related to your issue. TSBs can provide valuable information about the problem you are experiencing and may even provide a solution. Checking for TSBs should be one of the first steps you take when diagnosing a problem with your bike.
Checking for ECM Updates
One type of TSB that is particularly important to check for is an ECM flash update. An ECM flash is a software update for the engine control module (ECM) that can fix a variety of problems with your motorcycle. Harley-Davidson releases ECM flash updates periodically to address known issues with their bikes.
If you are experiencing trouble with your Harley-Davidson motorcycle, it is important to check for any available ECM flash updates. These updates can often fix problems that would otherwise be difficult or expensive to diagnose and repair. To check for available ECM flash updates, you can contact your local Harley-Davidson dealer or use Harley-Davidson’s online resources.
In summary, Technical Service Bulletins are important resources for Harley-Davidson motorcycle owners. They can provide valuable information about known issues and may even provide a solution to your problem. Checking for ECM flash updates is particularly important, as these updates can often fix problems that would otherwise be difficult or expensive to diagnose and repair.
Preventive Measures and Maintenance
As a Harley owner, you know how important it is to take care of your bike. Preventive measures and regular maintenance can help you avoid issues like the P2135 code. Here are some tips to help keep your bike in great shape.
Regular Inspections
Regular inspections are essential to prevent issues like the P2135 code. Make sure you inspect your throttle body regularly to ensure it’s clean and free of debris. If you notice any dirt or grime, use a throttle body cleaner to clean it. Be sure to follow the manufacturer’s instructions when using any cleaning products.
Another important area to inspect is the wiring harness. Make sure it’s clean and free of corrosion. Use dielectric grease to protect the connectors and ensure they stay clean and dry. Inspect the connectors for any signs of wear or damage and replace them if necessary.
Using Quality Parts
Using quality parts is essential when maintaining your Harley. Cheap or inferior parts can cause issues like the P2135 code. When replacing parts, be sure to use OEM or high-quality aftermarket parts. This will help ensure your bike runs smoothly and prevent issues down the line.
Regular maintenance is also essential to keep your Harley running smoothly. Make sure you follow the manufacturer’s recommended maintenance schedule and perform all necessary maintenance tasks. This will help prevent issues like the P2135 code and keep your bike running smoothly for years to come.
By following these preventive measures and performing regular maintenance, you can help prevent issues like the P2135 code from occurring. This will help ensure your Harley runs smoothly and stays in great shape for years to come.
Advanced Troubleshooting Techniques
If you have already checked the wiring and connectors and the problem persists, it may be time to move on to more advanced troubleshooting techniques. Here are some methods to help you troubleshoot the P2135 code:
Interpreting Sensor Data
One way to troubleshoot the P2135 code is to use a scan tool to interpret sensor data. This will allow you to see real-time data from the throttle control actuator and other sensors. You can use this data to determine if there is a problem with the throttle control actuator or another component.
Look for any sensor readings that are out of range or fluctuating rapidly. If you see any abnormalities, this could be a sign of a problem. Additionally, compare the readings from the throttle position sensor to those from the pedal position sensor. If the two readings do not match, this could indicate a problem with one of the sensors.
Voltage and Resistance Checks
Another way to troubleshoot the P2135 code is to perform voltage and resistance checks on the throttle control actuator and other components. Use a multimeter to check the voltage and resistance at the throttle control actuator and other sensors.
First, check the voltage at the throttle control actuator. The voltage should be between 4.5 and 5.5 volts. If the voltage is outside of this range, this could indicate a problem with the throttle control actuator or another component.
Next, check the resistance of the throttle position sensor and the pedal position sensor. The resistance should be within the manufacturer’s specifications. If the resistance is outside of the specifications, this could indicate a problem with one of the sensors.
In conclusion, advanced troubleshooting techniques can help you diagnose the P2135 code. Interpreting sensor data and performing voltage and resistance checks can help you identify the root cause of the problem. If you are unsure about any of these techniques, consult a professional mechanic or refer to your vehicle’s service manual for guidance.