If you own a Harley-Davidson motorcycle and have noticed the engine light on, it could be due to a diagnostic trouble code (DTC) known as P2185. This code refers to a problem with the Engine Coolant Temperature (ECT) sensor 2, which is a thermistor attached to the radiator that measures the engine coolant temperature. If the ECT sensor 2 output voltage is less than a set value when the engine coolant temperature is high, the PCM detects a fault and triggers the P2185 code.

The P2185 code can cause a variety of symptoms, including a malfunctioning air conditioning system, reduced fuel efficiency, and poor engine performance. If you notice any of these symptoms, it’s important to address the issue promptly to prevent further damage to your motorcycle. Fortunately, there are several DIY methods to fix the P2185 code, including replacing the ECT sensor, checking the wiring and connections, and resetting the engine control module (ECM).

If you’re not comfortable diagnosing and repairing the P2185 code yourself, it’s best to take your Harley-Davidson to a qualified mechanic or dealership. They can perform a thorough diagnosis and provide professional repairs to ensure your motorcycle is running smoothly and safely. Remember, addressing the P2185 code promptly can prevent further damage and save you money in the long run.

Understanding Harley Code P2185

If you see the Harley Code P2185, it means that there is an issue with the engine coolant temperature sensor circuit. This code is a DTC or trouble code that is stored in the engine control module (ECM) when the sensor detects a high temperature that is outside the normal range.

Definition and Significance

The P2185 code is significant because it can cause a variety of issues with your Harley-Davidson motorcycle. First and foremost, a malfunctioning engine coolant temperature sensor can cause your engine to overheat. This can lead to engine damage and potential safety hazards. Additionally, a bad sensor can cause your air conditioning system to malfunction, reduced fuel efficiency, and engine performance issues.

Common Causes and Diagnostics

There are several common causes of the P2185 code. These include a malfunctioning engine coolant temperature sensor, a failing PCM, and a bad connection in the #2 ECT sensor. To diagnose the issue, you can use a diagnostic scan tool to read the trouble code and determine the root cause of the problem.

If the issue is with the engine coolant temperature sensor, you can replace it with a new one. If the problem is with the PCM, you may need to replace it as well. Additionally, you should check all connections and wiring to ensure that they are secure and free of damage.

In conclusion, the P2185 code is a significant issue that should be addressed promptly to avoid potential engine damage and safety hazards. By understanding the common causes and diagnostics of this code, you can take the necessary steps to fix the issue and get back on the road.

Symptoms of Code P2185

If your Harley is experiencing code P2185, there are a few symptoms that you may notice. These symptoms can indicate that there is a problem with your engine that needs to be addressed. Here are some of the most common symptoms of code P2185:

Engine Light Indicators

The most obvious symptom of code P2185 is that the check engine light will come on. This is an indication that there is a problem with your vehicle’s engine that needs to be addressed. The check engine light can be a solid light or it may flash depending on the severity of the problem. If the check engine light is on, you should have your Harley checked by a qualified mechanic as soon as possible.

Performance Issues

Another symptom of code P2185 is poor performance. You may notice that your Harley is not performing as well as it used to. Your engine may be running hot or you may experience poor fuel economy. You may also notice that your Harley is idling roughly or stalling. These performance issues can be caused by a malfunctioning engine coolant temperature sensor.

If you notice any of these symptoms, it is important to have your Harley checked by a qualified mechanic. Ignoring these symptoms can lead to more serious problems down the road. With prompt diagnosis and repair, you can get your Harley back on the road and running smoothly again.

Engine Coolant Temperature Sensor

The Engine Coolant Temperature (ECT) sensor is an essential component of your Harley’s engine. It measures the temperature of the engine coolant and sends the information to the Powertrain Control Module (PCM). The PCM uses this information to adjust the fuel injection and ignition timing, ensuring optimal engine performance.

Sensor Function

The ECT sensor is a thermistor that changes its resistance based on the temperature of the engine coolant. When the engine is cold, the resistance is high, and as the engine warms up, the resistance decreases. The PCM monitors the voltage output from the ECT sensor and uses this information to determine the engine coolant temperature.

Troubleshooting the ECT Sensor

If your Harley is displaying the P2185 code, it means that there is an issue with the #2 ECT sensor circuit. Here are some steps you can take to troubleshoot the ECT sensor:

1. Check the wiring: Inspect the wiring harness for any signs of damage, such as frayed wires or corroded connectors. Make sure that the wiring is properly connected and that there are no loose connections.

2. Check the sensor: Use a multimeter to test the resistance of the ECT sensor. Compare the reading to the specifications in your Harley’s service manual. If the reading is outside of the specified range, the sensor may be faulty and need to be replaced.

3. Check the PCM: If the wiring and sensor are both functioning correctly, the issue may be with the PCM. A faulty PCM can cause the P2185 code to appear. However, this is a less common cause of the issue.

In conclusion, the ECT sensor plays a critical role in ensuring optimal engine performance. If you are experiencing issues with your Harley, such as the P2185 code, it is essential to troubleshoot the ECT sensor and address any issues promptly.

Electrical Components and Wiring

When it comes to Harley code P2185, there are a few things you can do to troubleshoot the issue. One of the first things you should check is the electrical components and wiring. Here are some steps you can take to inspect the wiring harness and check sensor connections:

Inspecting the Wiring Harness

The wiring harness is a crucial component that connects the various sensors and electrical components in your Harley. If there is an issue with the wiring harness, it can cause a variety of problems, including circuit high, open or short, and bad connection. To inspect the wiring harness, you should follow these steps:

1. Disconnect the battery to prevent any electrical shocks or damage.
2. Inspect the wiring harness for any visible signs of damage, such as frayed wires, cuts, or corrosion.
3. Check the ground circuit and ensure that it is properly connected.
4. Check the voltage feed and ensure that it is providing the correct voltage.
5. Use a multimeter to check for continuity in the wiring harness.

Checking Sensor Connections

Another thing you should check is the sensor connections. If the connections are loose or damaged, it can cause the sensor to malfunction and trigger the P2185 code. Here are some steps you can take to check the sensor connections:

1. Locate the engine coolant temperature sensor and inspect the connection.
2. Check for any visible signs of damage, such as corrosion or loose connections.
3. Use a multimeter to check for continuity in the sensor connection.
4. If there is an issue with the connection, you may need to replace the sensor.

By following these steps, you can troubleshoot the electrical components and wiring in your Harley and potentially fix the P2185 code. However, if you are unsure about any of these steps, it is always best to consult a professional mechanic.

Cooling System Overview

The cooling system is an essential component of your Harley Davidson motorcycle. It helps regulate the temperature of the engine and prevents it from overheating. The cooling system comprises several parts that work together to keep the engine at an optimal temperature, including the thermostat, radiator, and coolant level.

Role of the Thermostat

The thermostat is a crucial component of the cooling system. It regulates the temperature of the engine by controlling the flow of coolant to the radiator. When the engine is cold, the thermostat remains closed, preventing the coolant from flowing to the radiator. This allows the engine to warm up quickly. Once the engine reaches its operating temperature, the thermostat opens, allowing the coolant to flow to the radiator and cool the engine.

Radiator and Coolant Levels

The radiator is responsible for dissipating the heat generated by the engine. It does this by passing coolant through a series of fins, which dissipate the heat into the air. The radiator fan helps to increase airflow through the fins, further increasing the cooling efficiency.

It is essential to maintain the proper coolant level in your motorcycle. Low coolant levels can cause the engine to overheat, which can lead to serious damage. You should check the coolant level regularly and top it up as necessary. If you notice that the coolant level is consistently low, you should have your motorcycle checked by a professional.

In summary, the cooling system is a critical component of your Harley Davidson motorcycle. It helps regulate the temperature of the engine and prevents it from overheating. The thermostat, radiator, and coolant level are all essential parts of the cooling system. It is essential to maintain these components to ensure that your motorcycle runs smoothly and efficiently.

Diagnostic Procedures

If your Harley-Davidson motorcycle is displaying the P2185 code, it indicates that there is a high circuit voltage in the engine coolant temperature sensor 2. This could be due to a malfunction in the sensor, or due to issues with the wiring or connections.

To diagnose the root cause of the P2185 code, you can use either an OBD-II scanner or manual testing and resistance check.

Using an OBD-II Scanner

Using an OBD-II scanner is a quick and easy way to diagnose the P2185 code. Simply connect the scanner to your motorcycle’s OBD-II port and read the code. The scanner will provide you with a description of the code and any other relevant information, such as freeze frame data.

If the scanner indicates that the engine coolant temperature sensor 2 circuit is reading high, you can proceed with further testing to determine the root cause of the issue.

Manual Testing and Resistance Check

If you prefer to diagnose the issue manually, you can use a multimeter to measure the resistance of the engine coolant temperature sensor 2. This will help you determine if the sensor is functioning properly or if it needs to be replaced.

To perform a resistance check, first, locate the engine coolant temperature sensor 2. It is usually located near the thermostat housing or on the cylinder head. Once you have located the sensor, disconnect the electrical connector and use a multimeter to measure the resistance between the two pins of the sensor.

The resistance should be within the manufacturer’s specified range. If the resistance is too high or too low, the sensor may be faulty and need to be replaced. If the resistance is within the specified range, you can proceed with further testing of the wiring and connections.

By following these diagnostic procedures, you can determine the root cause of the P2185 code and take the necessary steps to fix the issue.

Troubleshooting and Repair

When to Visit a Mechanic

If your Harley is displaying the P2185 code, you may want to consider visiting a mechanic. This code indicates that the engine coolant temperature sensor 2 circuit is reading high. A mechanic can diagnose the specific cause of this code and make the necessary repairs.

If you notice any of the following symptoms, it’s time to take your Harley to a mechanic:

• Check engine light is on
• Engine is running hot
• Poor fuel economy
• Engine is idling roughly

A mechanic can run diagnostic tests to determine the root cause of these symptoms and make the necessary repairs to your Harley.

DIY Repair Tips

If you’re comfortable working on your Harley yourself, there are a few things you can try before taking it to a repair shop. Here are a few DIY repair tips:

• Check the coolant level: Low coolant levels can cause the engine to run hot and trigger the P2185 code. Check the coolant level and top it off if necessary.
• Check the wiring and connector: A bad connection in the ECT sensor 2 circuit can cause the P2185 code. Check the wiring and connector for damage or corrosion. Repair or replace the damaged wiring or connector if necessary.
• Replace the ECT sensor: If the above steps do not resolve the P2185 code, it may be necessary to replace the ECT sensor. This is a relatively simple DIY repair that can be done with basic tools.

Remember, if you’re not comfortable working on your Harley yourself, it’s always best to take it to a professional mechanic. They have the knowledge and experience to diagnose and repair the issue quickly and efficiently.

Preventive Measures and Maintenance

To prevent the P2185 code from occurring, it is important to perform regular maintenance on your Harley-Davidson motorcycle. Here are some preventive measures you can take:

• Check engine coolant level regularly: Make sure the engine coolant level is at the recommended level. Low coolant levels can cause the engine to overheat, which can trigger the P2185 code.

• Replace the engine coolant: Over time, engine coolant can become contaminated, which can affect its ability to regulate engine temperature. Follow the manufacturer’s recommended schedule for replacing the engine coolant.

• Inspect the engine coolant temperature sensor: Inspect the engine coolant temperature sensor for damage or corrosion. If the sensor is damaged, it may not provide accurate readings, which can trigger the P2185 code.

• Monitor engine performance: Keep an eye on your Harley’s engine performance. If you notice any unusual behavior, such as poor acceleration or decreased fuel economy, it could be a sign of a problem that could trigger the P2185 code.

By following these preventive measures, you can reduce the likelihood of the P2185 code occurring on your Harley-Davidson motorcycle. Regular maintenance can also help improve fuel economy and engine performance, which can make your riding experience more enjoyable.