Engine-Codes.com
Engine-Codes – Generic – P2186

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

Quick Answer

The P2186 diagnostic trouble code (DTC) indicates that there is an issue with the Engine Coolant Temperature Sensor 2 Circuit being intermittent or erratic. Common causes include Faulty Engine Coolant Temperature Sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or poor connections in the sensor circuit. 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 Faulty Engine Coolant Temperature Sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or poor connections in the sensor circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P2186 Description

The P2186 diagnostic trouble code (DTC) indicates that there is an issue with the Engine Coolant Temperature Sensor 2 Circuit being intermittent or erratic. This sensor is responsible for monitoring the temperature of the engine coolant and sending this information to the engine control module (ECM). The ECM uses this data to adjust fuel delivery and ignition timing to optimize engine performance and fuel efficiency.

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

Common Causes of P2186

  1. Faulty Engine Coolant Temperature Sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Corrosion or poor connections in the sensor circuit
  4. Malfunctioning ECM
  5. Coolant leaks affecting sensor readings

Symptoms of P2186

  1. Engine running hot or overheating
  2. Rough idling or stalling
  3. Decreased fuel efficiency
  4. Check Engine Light illuminated
  5. Difficulty starting the vehicle

How to Fix P2186

  1. Begin by diagnosing the issue using a scan tool to retrieve the DTC and checking the Engine Coolant Temperature Sensor 2 Circuit for any visible damage or corrosion.
  2. Test the Engine Coolant Temperature Sensor using a multimeter to ensure it is functioning correctly.
  3. Inspect the wiring and connectors in the sensor circuit for any damage or loose connections, repairing or replacing as needed.
  4. Clear the DTC and reset the ECM to see if the issue persists after repairs.
  5. Test drive the vehicle to ensure that the Engine Coolant Temperature Sensor 2 Circuit is now functioning properly and that all symptoms have been resolved.

Cost to Fix P2186

The typical repair costs for addressing the P2186 code can vary depending on the specific cause of the issue. In general, replacing a faulty Engine Coolant Temperature Sensor can cost between $50 and $150, while addressing wiring or connector issues may range from $100 to $300. Labor costs can add an additional $80 to $150 per hour, with the total repair bill potentially ranging from $150 to $500 or more. It is advisable to consult with a professional mechanic to get an accurate estimate based on the specific circumstances of your vehicle.

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

Code P2186 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.

Discuss the causes and fixes for P2186 OBDII Code

Submit a New Comment

Code P2186 comments

No comments found for this page.