AutoCodes – Ford – P0118 2009 Ford Fusion

P0118 2009 Ford Fusion Code - Engine Coolant Temperature Sensor Circuit High

Quick Answer

The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. Common causes include Low engine coolant level, Faulty engine coolant thermostat, Faulty Engine Coolant Temperature (ECT) Sensor or Cylinder Head Temperature (CHT) Sensor. 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: P0118 2009 Ford Fusion indicates Engine Coolant Temperature Sensor Circuit High.
Common causes: Common causes include Low engine coolant level, Faulty engine coolant thermostat, Faulty Engine Coolant Temperature (ECT) Sensor or Cylinder Head Temperature (CHT) Sensor.
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 3,429

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 Aug 02, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0118 2009 Ford Fusion Description

The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Powertrain Control Module (PCM). The modified signal returns to the PCM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases. The Diagnostic Trouble Code (DTC) indicates the sensor signal is greater than the self-test maximum. The ECT sensor maximum is 4.6 volts or -50°C (-58°F).

OBDII Code P0118 2009 Ford Fusion - Engine Coolant Temperature Sensor Circuit High - AutoCodes.com — P0118 2009 Ford Fusion Code - Engine Coolant Temperature Sensor Circuit High

What does this mean?

What are the Possible Causes of the DTC P0118 2009 Ford Fusion?

Low engine coolant level
Faulty engine coolant thermostat
Faulty Engine Coolant Temperature (ECT) Sensor or Cylinder Head Temperature (CHT) Sensor
Engine Coolant Temperature Sensor or Cylinder Head Temperature Sensor harness is open or shorted
Engine Coolant Temperature Sensor or Cylinder Head Temperature Sensor circuit poor electrical connection

How to Fix the DTC P0118 2009 Ford Fusion?

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 does this mean?

Code Tech Notes

Start by checking for coolant leaks, and if there are no leaks, the thermostat might be stuck closed and needs replacement. If the problem persists, change the Engine Coolant Temperature (ECT) sensor.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0118 2009 Ford Fusion 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.

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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 P0118 2009 Ford Fusion Code

1. What are common symptoms of OBDII code P0118 in a 2009 Ford Fusion?

The common symptoms include engine overheating, decrease in fuel efficiency, rough idling, and potential stalling of the vehicle.

2. What does the OBDII code P0118 in a 2009 Ford Fusion indicate?

The code P0118 signifies a high voltage signal from the Engine Coolant Temperature (ECT) sensor circuit, indicating a potential issue with the engine's cooling system.

3. What are the possible causes of OBDII code P0118 in a 2009 Ford Fusion?

Potential causes include a faulty ECT sensor, damaged wiring or connectors in the ECT circuit, low coolant levels, a malfunctioning thermostat, or a problem with the engine's computer system.

4. How can I diagnose the OBDII code P0118 in my 2009 Ford Fusion?

Diagnosing the code involves checking the ECT sensor for proper voltage output, inspecting the wiring and connectors for any damage, verifying coolant levels, and testing the thermostat's functionality.

5. Can I drive my 2009 Ford Fusion with OBDII code P0118?

It is not recommended to drive your vehicle with the code P0118 as it can lead to engine overheating and potential damage. It is advisable to address the issue promptly.

6. How can I repair OBDII code P0118 in my 2009 Ford Fusion?

Repairing the code may involve replacing the ECT sensor, repairing or replacing damaged wiring or connectors, ensuring proper coolant levels, checking the thermostat, and resetting the engine code.

7. Will resetting the OBDII code P0118 in my 2009 Ford Fusion solve the issue?

While resetting the code may temporarily remove the warning light, it will not fix the underlying problem causing the high voltage signal from the ECT sensor circuit.

8. How much does it cost to fix OBDII code P0118 in a 2009 Ford Fusion?

The cost of fixing the code can vary depending on the specific issue causing it. Replacing the ECT sensor can range from $50 to $150, while repairing wiring or cooling system components can incur additional costs.

9. Can a DIY enthusiast repair OBDII code P0118 in a 2009 Ford Fusion?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address the code by replacing the ECT sensor or repairing simple wiring issues. However, complex diagnostics may require professional assistance.

10. How often does OBDII code P0118 occur in a 2009 Ford Fusion?

The occurrence of code P0118 can vary depending on the vehicle's maintenance history, driving conditions, and overall health of the cooling system. Regular maintenance and prompt attention to cooling system issues can help prevent this code from appearing.