What is OBD-II Code P2185 - Engine Coolant Temperature Sensor 2 Circuit High • OBD II Code

What is OBD-II Code P2185 – Engine Coolant Temperature Sensor 2 Circuit High

As a mechanic, I often come across OBD-II codes that confuse my clients, and one of them is P2185. P2185 is an OBD-II code that is related to the engine’s coolant temperature sensor. In this article, I will provide a comprehensive explanation of what P2185 means, how to diagnose the issue, and how to repair the issue.

Understanding OBD-II Codes

First, let’s define OBD-II codes. OBD-II codes are diagnostic trouble codes that are generated by the onboard diagnostic system when there is a problem with the vehicle’s engine, transmission, or emissions control system. These codes help mechanics to quickly identify the issue and fix the problem.

What is OBD-II Code P2185?

P2185 is an OBD-II code that is related to the engine coolant temperature sensor. The engine coolant temperature sensor is responsible for measuring the temperature of the engine coolant. This information is sent to the engine control module (ECM), which uses it to adjust the fuel injection and ignition timing to maximize engine performance and minimize emissions.

When the engine coolant temperature sensor 2 circuit sends a signal to the ECM that is higher than expected, or the sensor is not sending any signal, P2185 is generated, indicating a problem with the engine coolant temperature sensor 2 circuit.

How to diagnose OBD-II Code P2185

To diagnose P2185, the following steps should be taken:

Step 1: Check the coolant level

The first step is to check the coolant level and make sure that the coolant is at the right level. If the coolant level is low, this can cause the engine coolant temperature sensor to send a high signal to the ECM, triggering P2185.

Step 2: Check the engine coolant temperature sensor

The second step is to check the engine coolant temperature sensor. Start by locating the engine coolant temperature sensor, which is usually located near the thermostat housing or the radiator. Once you find the sensor, disconnect the electrical connector and use a multimeter to check the resistance between the terminals.

The resistance should change as the engine coolant temperature changes. If the resistance does not change, or if the resistance is out of range, the engine coolant temperature sensor is faulty, and it needs to be replaced.

Step 3: Check the wiring and connectors

The third step is to check the wiring and connectors between the engine coolant temperature sensor and the ECM. Start by inspecting the wiring and connectors for any signs of damage or corrosion. If you find any damage, repair or replace the damaged wiring or connector.

If the wiring and connectors are in good condition, use a multimeter to check the continuity between the engine coolant temperature sensor and the ECM. If there is no continuity, there is a break in the wiring, and it needs to be repaired or replaced.

How to Repair OBD-II Code P2185

Once you have diagnosed the issue, the next step is to repair the issue. If the issue is with the engine coolant temperature sensor, the sensor needs to be replaced. If the issue is with the wiring or connector, the damaged wiring or connector needs to be repaired or replaced.

After replacing the engine coolant temperature sensor, clear the OBD-II code using an OBD-II scanner. If the issue has been successfully repaired, the code should not reappear.

Frequently Asked Questions

1. What causes OBD-II Code P2185?

OBD-II Code P2185 is caused by a problem with the engine coolant temperature sensor 2 circuit. This could be caused by a faulty engine coolant temperature sensor, a wiring issue or a problem with the electrical connector.

2. Can I still drive my car if it has OBD-II Code P2185?

Yes, you can still drive your car if it has OBD-II Code P2185. However, it is important to get the issue diagnosed and repaired as soon as possible to avoid any further damage to the engine.

3. Will a faulty engine coolant temperature sensor affect my fuel economy?

Yes, a faulty engine coolant temperature sensor can affect your fuel economy. The engine coolant temperature sensor is responsible for telling the engine control module how much fuel to inject into the engine, and if it is not working correctly, it can affect your fuel economy.

4. How much does it cost to repair OBD-II Code P2185?

The cost to repair OBD-II Code P2185 will depend on the root cause of the issue. If it is a problem with the engine coolant temperature sensor, the cost to replace the sensor can range from $50 to $150. If it is a wiring issue, the cost to repair the wiring can range from $50 to $200.

5. Can I fix OBD-II Code P2185 myself?

Diagnosing OBD-II Code P2185 can be done yourself with the right tools and knowledge. However, if you are not comfortable working on your car, it is recommended that you take your car to a qualified mechanic to get the issue diagnosed and repaired.

Case Study

A client brought in their 2012 Honda Civic complaining of low power and poor fuel economy. We connected an OBD-II scanner, and it displayed P2185. After checking the coolant level, we suspected a faulty engine coolant temperature sensor. We proceeded to check the sensor and found that it was out of range.

We replaced the engine coolant temperature sensor and cleared the code. After test-driving the car, the client reported that the car was running smoother, and the fuel economy had improved.

Interview with Industry Expert

We reached out to an industry expert to gain deeper insights into the engine coolant temperature sensor and OBD-II codes. According to the expert, the engine coolant temperature sensor can affect the entire engine’s performance, and a faulty engine coolant temperature sensor can result in several OBD-II codes.

They also mentioned that diagnosing the issue requires a systematic approach and the right tools. While replacing the engine coolant temperature sensor is relatively straightforward, diagnosing the issue may require more knowledge and expertise.