P2185: OBD-2 error code interpretation and solutions

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Vehicle engine and/or automatic transmission

Code: P2185 - Engine Coolant Temperature Sensor 2 Circuit High

The diagnostic trouble code (DTC) P2185 means "High Voltage in Engine Coolant Temperature Sensor Circuit 2." This code is set when the engine control module (PCM) detects an electrical fault in the engine coolant temperature (ECT) sensor circuit.

The ECT sensor is a thermistor responsible for measuring the temperature of the coolant passing through the engine. It is typically located in the cooling channel within the cylinder head. The resistance of this sensor is high when the coolant temperature is low and decreases as the coolant temperature rises.

The PCM monitors voltage changes from the ECT sensor to determine coolant temperature. If the ECT sensor shows a lower-than-expected temperature after the engine has been running for several minutes, the PCM identifies a fault and sets code P2185. The PCM may also set this code if the ECT sensor resistance does not match expected values.

This OBD code is common among various car brands, including Ford, Toyota, Skoda, Hyundai, Kia, Volkswagen, Mercedes-Benz, Renault, Nissan, BMW, and others.

Causes of OBD P2185

Diagnostic trouble codes like P2185 can have multiple possible causes. Here are some potential issues that may trigger code P2185:

Faulty ECT sensor
PCM failure
Poor connection in the #2 ECT sensor circuit
Open circuit in the ground wire between the #2 ECT sensor and PCM
Short circuit in the voltage supply line between the ECT sensor and PCM
PCM failure (rare)
Other wiring issues

Symptoms of P2185 Error

Diagnostic codes can present various symptoms, or sometimes none at all. Here are some common symptoms you may notice if dealing with OBD-II code P2185:

Illuminated check engine light or malfunction indicator lamp
Air conditioning may not work
Reduced engine performance
Increased fuel consumption
Possible engine startup failure

How to Diagnose DTC P2185?

Different DTCs may share common causes and symptoms. Therefore, it is essential to thoroughly diagnose the issue before performing any repairs or replacing components.

Fortunately, there are many automotive repair resources and manuals available today. These can help you understand diagnostic codes, their definitions, and ways to fix them.

How to Fix Code P2185?

Fixing a DTC is a complex process. Different codes may have similar causes, and each potential cause has its own solution. Automakers also have their recommendations for repair procedures. A solution for code P2185 in a Honda may not work for the same code in a Volkswagen. There is no universal fix for DTCs.

Proper diagnosis and repair of DTCs require specialized tools and expertise. If you are unsure about your ability to repair a DTC, it is best to consult a certified mechanic to avoid costly repairs in the future.

Conclusion

Code P2185 is identical to P0118. The only difference between these two codes is that OBD-II code P2185 refers to line 2 of the ECT sensor. This means that vehicles with code P2185 have two ECT sensors. When dealing with P2185, make sure to diagnose and repair the correct sensor circuit.

By connecting your OBD-II scanner to your vehicle's OBD-II port, you can review currently stored DTCs. If you encounter code P2185 or related codes, it is strongly recommended to stop driving and visit an auto repair shop for diagnosis and repair as soon as possible.

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OBD P2185 code analysis and solutions

The page presents a detailed analysis of code P2185 for Opel, Renault, VW (Volkswagen), Ford, Peugeot, Mitsubishi, Skoda, BMW, Citroën, Toyota, Lada, Honda, Kia, and other models to investigate probable causes and solutions related to OBD 2 errors, with focus on the issue. We provide technical documentation and approaches for diagnostics to identify and overcome the difficulty effectively. We aim to make our resource a comprehensive source of information on issues related to OBD 2 errors, equipping you with the means for effective repair and maintenance of your auto. If during the repair of OBD-2 codes you need to purchase parts, don’t forget to visit Avtopro!