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P0128 2011 Ford Fusion Code - Coolant Thermostat

Quick Answer

The P0128 code in a 2011 Ford Fusion indicates a potential issue with the coolant thermostat. Common causes include Stuck open thermostat, Faulty coolant temperature sensor, Low coolant levels. 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
P0128 2011 Ford Fusion indicates Coolant Thermostat.
Common causes
Common causes include Stuck open thermostat, Faulty coolant temperature sensor, Low coolant levels.
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 10, 2024
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Code P0128 2011 Ford Fusion Description

The P0128 code in a 2011 Ford Fusion indicates a potential issue with the coolant thermostat. The coolant thermostat is a crucial component of the vehicle's cooling system, responsible for regulating the temperature of the engine. When the engine is running, the thermostat opens and closes to allow coolant to flow through the engine and radiator to maintain optimal operating temperatures.

OBDII Code P0128 2011 Ford Fusion - Coolant Thermostat
P0128 2011 Ford Fusion Code - Coolant Thermostat

Common Causes of P0128 2011 Ford Fusion

  1. Stuck open thermostat
  2. Faulty coolant temperature sensor
  3. Low coolant levels
  4. Air pockets in the cooling system
  5. Electrical issues with the thermostat or sensor

Symptoms of P0128 2011 Ford Fusion

  1. Engine running colder than normal
  2. Poor fuel economy
  3. Check Engine Light illuminated
  4. Heating system not working properly
  5. Slow warm-up time for the engine

How to Fix P0128 2011 Ford Fusion

  1. Perform a visual inspection of the cooling system, checking for leaks, low coolant levels, or any visible damage.
  2. Test the thermostat and coolant temperature sensor to determine if they are functioning correctly.
  3. If the thermostat is stuck open, replace it with a new one and ensure proper installation.
  4. If the coolant temperature sensor is faulty, replace it and reset the error code.
  5. Bleed the cooling system to remove any air pockets and ensure proper circulation of coolant.

Cost to Fix P0128 2011 Ford Fusion

The cost of repairing a coolant thermostat issue can vary depending on the specific cause of the problem and the cost of parts and labor in your area. Typically, replacing a thermostat can cost between $150 and $300, including parts and labor. However, if additional repairs or diagnostics are needed, the cost could be higher. It's recommended to consult with a professional mechanic to get an accurate estimate for your specific situation.

What does this mean?

Tech Notes for P0128 2011 Ford Fusion

Start by checking for coolant leaks, if there are not leaks the thermostat might be stuck open or closed and may need to be replaced, you still have an issue the engine coolant temp sensor or cylinder head temp sensor.

When is the Code Detected?

The engine coolant temperature does not reach to specified temperature even though the engine has run long enough.

Need more information about the P0128 2011 Ford Fusion code?

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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 P0128 2011 Ford Fusion Code

1. What does OBDII code P0128 mean on a 2011 Ford Fusion?

The P0128 code on a 2011 Ford Fusion indicates a problem with the coolant thermostat, specifically that the engine is not reaching operating temperature within the expected time frame.

2. What are common symptoms of a P0128 code on a 2011 Ford Fusion?

Common symptoms of a P0128 code in a 2011 Ford Fusion include a lower than normal engine temperature gauge reading, poor fuel economy, and potentially reduced heater performance.

3. What are the possible causes of a P0128 code on a 2011 Ford Fusion?

Common causes of a P0128 code on a 2011 Ford Fusion include a faulty thermostat, low coolant levels, a malfunctioning coolant temperature sensor, or issues with the cooling system.

4. Can I continue driving my 2011 Ford Fusion with a P0128 code?

It's not recommended to continue driving your 2011 Ford Fusion with a P0128 code as it can lead to decreased fuel efficiency, potential engine damage, and other issues. It's best to address the problem promptly.

5. How can I fix a P0128 code on my 2011 Ford Fusion?

To fix a P0128 code on a 2011 Ford Fusion, you may need to replace the thermostat, check and top up coolant levels, inspect the coolant temperature sensor, and ensure the cooling system is functioning properly.

6. Is it possible to reset a P0128 code on a 2011 Ford Fusion without fixing the issue?

While you can clear the error code using an OBDII scanner, it's not recommended to do so without addressing the underlying problem causing the P0128 code. Resetting the code without fixing the issue may lead to further complications.

7. How much does it cost to repair a P0128 code on a 2011 Ford Fusion?

The cost to repair a P0128 code on a 2011 Ford Fusion can vary depending on the exact cause of the issue, but it may involve expenses for parts and labor, ranging from $100 to $300 or more.

8. Can a DIY enthusiast fix a P0128 code on a 2011 Ford Fusion?

Depending on your skills and experience, a DIY enthusiast may be able to address a P0128 code on a 2011 Ford Fusion by replacing the thermostat or checking coolant levels. However, more complex issues may require professional help.

9. How long does it take to repair a P0128 code on a 2011 Ford Fusion?

The time required to repair a P0128 code on a 2011 Ford Fusion can vary based on the underlying cause and the extent of the repairs needed. It may take anywhere from 1 to 3 hours or more to fix the issue.

10. Will a P0128 code on a 2011 Ford Fusion affect the car's performance?

A P0128 code on a 2011 Ford Fusion can impact the car's performance by reducing fuel efficiency and potentially causing engine issues if left unresolved. It's best to address the problem promptly to maintain optimal performance.

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