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P0117 2009 Ford Fusion Code - Engine Coolant Temperature Sensor Circuit Low

Quick Answer

The P0117 code for a 2009 Ford Fusion indicates a problem with the Engine Coolant Temperature (ECT) Sensor Circuit being too low. Common causes include Faulty Engine Coolant Temperature (ECT) sensor, Damaged or corroded wiring/connectors in the ECT sensor circuit, ECM malfunction. 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
P0117 2009 Ford Fusion indicates Engine Coolant Temperature Sensor Circuit Low.
Common causes
Common causes include Faulty Engine Coolant Temperature (ECT) sensor, Damaged or corroded wiring/connectors in the ECT sensor circuit, ECM malfunction.
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 16, 2024
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Code P0117 2009 Ford Fusion Description

The P0117 code for a 2009 Ford Fusion indicates a problem with the Engine Coolant Temperature (ECT) Sensor Circuit being too low. The ECT sensor is a crucial component of the engine's cooling system, as it measures the temperature of the coolant and sends this information to the engine control module (ECM). The ECM uses this data to adjust fuel delivery and ignition timing, ensuring optimal engine performance and efficiency.

OBDII Code P0117 2009 Ford Fusion - Engine Coolant Temperature Sensor Circuit Low
P0117 2009 Ford Fusion Code - Engine Coolant Temperature Sensor Circuit Low

Common Causes of P0117 2009 Ford Fusion

  1. Faulty Engine Coolant Temperature (ECT) sensor
  2. Damaged or corroded wiring/connectors in the ECT sensor circuit
  3. ECM malfunction
  4. Low coolant level or air pockets in the cooling system
  5. Cooling system issues such as a stuck thermostat or a faulty water pump

Symptoms of P0117 2009 Ford Fusion

  1. Check Engine Light illuminated on the dashboard
  2. Poor fuel economy
  3. Rough idling or engine misfires
  4. Hesitation or lack of power during acceleration
  5. Engine stalling or difficulty starting

How to Fix P0117 2009 Ford Fusion

  1. Begin by diagnosing the root cause of the issue using a scan tool to read the fault codes and testing the ECT sensor and its circuit for proper operation.
  2. Inspect the ECT sensor, wiring, and connectors for any damage or corrosion. Replace any faulty components as needed.
  3. Check the coolant level and bleed the cooling system to remove any air pockets that could affect the ECT sensor readings.
  4. Test the ECM to ensure it is functioning correctly and reprogram it if necessary to recalibrate the ECT sensor readings.
  5. Clear the fault codes, reset the ECM, and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P0117 2009 Ford Fusion

The typical repair costs for addressing a P0117 code on a 2009 Ford Fusion can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. This estimate includes the price of a new ECT sensor, wiring repairs, and any additional components that may need replacement. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your location and vehicle specifics.

What does this mean?

Tech Notes for P0117 2009 Ford Fusion

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.

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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 P0117 2009 Ford Fusion Code

1. What are the common symptoms of OBDII code P0117 in a 2009 Ford Fusion?

- Common symptoms include issues with the engine temperature gauge, poor fuel economy, rough idling, and difficulty starting the engine.

2. What does the OBDII code P0117 on a 2009 Ford Fusion indicate?

- This code indicates a problem with the Engine Coolant Temperature (ECT) sensor circuit, specifically that the sensor is reading a low voltage.

3. What are the possible causes of the Engine Coolant Temperature Sensor Circuit Low in a 2009 Ford Fusion?

- Potential causes include a faulty ECT sensor, damaged wiring or connectors in the ECT circuit, a malfunctioning thermostat, or low coolant levels.

4. How can I diagnose the cause of OBDII code P0117 in my 2009 Ford Fusion?

- You can use a multimeter to test the ECT sensor for proper voltage readings, visually inspect the wiring and connectors for damage, and check the coolant levels and thermostat operation.

5. Can I continue driving my 2009 Ford Fusion with OBDII code P0117?

- It is not recommended to drive with this code unresolved, as it can lead to poor engine performance, potential overheating issues, and increased fuel consumption.

6. How can I repair OBDII code P0117 in my 2009 Ford Fusion?

- Repair steps may include replacing the Engine Coolant Temperature sensor, repairing or replacing damaged wiring or connectors, ensuring proper coolant levels, and checking the thermostat.

7. Will resetting the OBDII code P0117 in my 2009 Ford Fusion make it go away?

- Simply resetting the code will not fix the underlying issue causing P0117. It is important to diagnose and repair the root cause of the problem to prevent the code from reoccurring.

8. Can a DIY enthusiast fix OBDII code P0117 in a 2009 Ford Fusion?

- Depending on your skill level and access to tools, you may be able to address this issue yourself by following repair guides and being cautious when working with electrical components.

9. How much does it cost to repair OBDII code P0117 in a 2009 Ford Fusion at a mechanic?

- The cost of repairs can vary based on the specific cause of the issue, but it may range from $100 to $300 for parts and labor, excluding diagnostic fees.

10. Is it necessary to recheck the OBDII system after repairing code P0117 in a 2009 Ford Fusion?

- It is recommended to clear the code after repairs and monitor the system for a few drive cycles to ensure the issue has been successfully resolved.

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