AutoCodes – Ford – P0118 2008 Ford Fusion

P0118 2008 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 2008 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 4,564

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 2008 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 2008 Ford Fusion - Engine Coolant Temperature Sensor Circuit High - AutoCodes.com — P0118 2008 Ford Fusion Code - Engine Coolant Temperature Sensor Circuit High

What does this mean?

What are the Possible Causes of the DTC P0118 2008 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 2008 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 2008 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 2008 Ford Fusion Code

1. What are the common symptoms of OBDII code P0118 on a 2008 Ford Fusion?

The common symptoms of OBDII code P0118 on a 2008 Ford Fusion include the engine running hot or cold, poor fuel economy, and the check engine light coming on.

2. What does the OBDII code P0118 in a 2008 Ford Fusion indicate?

The OBDII code P0118 in a 2008 Ford Fusion indicates a problem with the Engine Coolant Temperature (ECT) sensor circuit reading higher than normal.

3. What are the possible causes of OBDII code P0118 in a 2008 Ford Fusion?

Possible causes of OBDII code P0118 in a 2008 Ford Fusion include a faulty ECT sensor, damaged wiring or connectors, low coolant level, or a malfunctioning thermostat.

4. How can I diagnose the OBDII code P0118 in my 2008 Ford Fusion?

To diagnose the OBDII code P0118 in a 2008 Ford Fusion, you can use a scan tool to read the trouble code, check the ECT sensor's wiring and connectors, test the sensor's resistance, and inspect the coolant level and thermostat.

5. Can I still drive my 2008 Ford Fusion with OBDII code P0118?

It is not recommended to drive your 2008 Ford Fusion with OBDII code P0118 as it can lead to overheating or other engine issues. It's best to address the problem promptly.

6. How do I repair OBDII code P0118 in my 2008 Ford Fusion?

To repair OBDII code P0118 in your 2008 Ford Fusion, you may need to replace the Engine Coolant Temperature (ECT) sensor, repair any damaged wiring or connectors, top up the coolant level, or replace a faulty thermostat.

7. Will resetting the check engine light fix OBDII code P0118 in my 2008 Ford Fusion?

Resetting the check engine light may temporarily turn it off, but it won't fix the underlying issue causing OBDII code P0118 in your 2008 Ford Fusion. It's important to diagnose and address the root cause.

8. How much does it cost to fix OBDII code P0118 in a 2008 Ford Fusion?

The cost to fix OBDII code P0118 in a 2008 Ford Fusion can vary depending on the specific cause of the issue. It could range from a simple sensor replacement to more extensive repairs involving wiring or cooling system components.

9. Can a DIY enthusiast fix OBDII code P0118 in a 2008 Ford Fusion?

A DIY enthusiast with the necessary tools and skills may be able to fix OBDII code P0118 in a 2008 Ford Fusion by following repair guides or online tutorials. However, it's important to proceed with caution and ensure proper diagnosis.

10. How often does OBDII code P0118 occur in a 2008 Ford Fusion?

OBDII code P0118 can occur in a 2008 Ford Fusion due to various reasons related to the Engine Coolant Temperature (ECT) sensor circuit. The frequency of occurrence may vary depending on driving conditions and maintenance history.