AutoCodes – Generic – P2186

P2186 Code - Engine Coolant Temperature Sensor 2 Circuit Intermittent/Erratic

Quick Answer

Two engine coolant temperature sensors and one intake air temperature sensor are used by the Powertrain Control Module (PCM). Common causes include Low coolant level, Faulty Engine Coolant Temperature Sensor, Stuck or leaking thermostat. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P2186 indicates Engine Coolant Temperature Sensor 2 Circuit Intermittent/Erratic.
Common causes: Common causes include Low coolant level, Faulty Engine Coolant Temperature Sensor, Stuck or leaking thermostat.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 8,622

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2186 Description

Two engine coolant temperature sensors and one intake air temperature sensor are used by the Powertrain Control Module (PCM). When the engine is stopped and enough time has passed, the temperature of the engine will equalize to the ambient temperature. When an inappropriate temperature is detected after comparing the temperature readings of each sensor, a malfunction in the corresponding sensor is detected and a Diagnostic Trouble Code (DTC) is stored.

OBDII Code P2186 - Engine Coolant Temperature Sensor 2 Circuit Intermittent/Erratic - AutoCodes.com — P2186 Code - Engine Coolant Temperature Sensor 2 Circuit Intermittent/Erratic

What does this mean?

What are the Possible Causes of the DTC P2186?

Low coolant level
Faulty Engine Coolant Temperature Sensor
Stuck or leaking thermostat
Engine Coolant Temperature Sensor harness is open or shorted
Engine Coolant Temperature Sensor circuit poor electrical connection

How to Fix the DTC P2186?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2186 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2186 code?

Need more information on how to fix the P2186 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2186 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P2186 Dodge — Engine Coolant Temperature Sensor 2 Circuit Intermittent/Erratic

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2186 Code

1. What are the common symptoms of OBDII code P2186?

- Common symptoms include issues with engine performance, such as rough idling, poor fuel efficiency, and potential stalling.

2. What causes the OBDII code P2186 to trigger?

- The code is typically triggered by a faulty engine coolant temperature sensor 2, wiring issues, or problems with the sensor circuit.

3. How can I diagnose the cause of OBDII code P2186?

- To diagnose P2186, you can use a scan tool to read the code, check the wiring and connections to the temperature sensor, and test the sensor's functionality.

4. Can a faulty engine coolant temperature sensor cause OBDII code P2186?

- Yes, a faulty engine coolant temperature sensor 2 can cause the P2186 code by providing incorrect temperature readings to the engine control module.

5. What are the potential repair options for OBDII code P2186?

- Repair options include replacing the engine coolant temperature sensor 2, repairing any damaged wiring or connections, and clearing the code with a scan tool.

6. Is it safe to continue driving with OBDII code P2186?

- It is not recommended to drive with the P2186 code present, as it can lead to potential engine performance issues and may cause further damage if left unresolved.

7. How important is it to fix OBDII code P2186 promptly?

- It is important to address P2186 promptly to ensure proper engine function, prevent potential damage to components, and maintain overall vehicle performance.

8. Can a DIY enthusiast repair OBDII code P2186?

- Depending on the cause of the code, a DIY enthusiast with automotive repair experience may be able to replace the engine coolant temperature sensor 2 or address wiring issues.

9. Will resetting the OBDII code P2186 make it go away permanently?

- Resetting the code may temporarily clear it, but if the underlying issue, such as a faulty sensor or wiring problem, is not addressed, the code is likely to reappear.

10. How much does it typically cost to repair OBDII code P2186 at a mechanic or dealership?

- The cost of repairing P2186 can vary depending on the cause of the issue, but it may involve diagnostic fees, parts costs for a new sensor, and labor charges, which could range from $100 to $300 or more.