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P0128 2009 Ford Fusion Code - Coolant Thermostat

Quick Answer

The P0128 diagnostic trouble code (DTC) for a 2009 Ford Fusion specifically relates to the coolant thermostat. Common causes include Faulty thermostat, Low coolant level, Air pockets in the cooling system. 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 2009 Ford Fusion indicates Coolant Thermostat.
Common causes
Common causes include Faulty thermostat, Low coolant level, Air pockets in the cooling system.
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 11, 2024
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Code P0128 2009 Ford Fusion Description

The P0128 diagnostic trouble code (DTC) for a 2009 Ford Fusion specifically relates to the coolant thermostat. This code indicates that the engine coolant temperature is below the thermostat regulating temperature. The thermostat is a crucial component of the vehicle's cooling system as it helps regulate the engine temperature by controlling the flow of coolant through the radiator. When the thermostat is stuck open or not functioning properly, the engine may not reach its optimal operating temperature, which can lead to reduced fuel efficiency, increased emissions, and poor performance.

OBDII Code P0128 2009 Ford Fusion - Coolant Thermostat
P0128 2009 Ford Fusion Code - Coolant Thermostat

Common Causes of P0128 2009 Ford Fusion

  1. Faulty thermostat
  2. Low coolant level
  3. Air pockets in the cooling system
  4. Cooling system leaks
  5. Electrical issues with the coolant temperature sensor

Symptoms of P0128 2009 Ford Fusion

  1. Engine running colder than normal
  2. Decreased fuel efficiency
  3. Heater not working or blowing cold air
  4. Engine overheating
  5. Check Engine Light illuminated

How to Fix P0128 2009 Ford Fusion

  1. Diagnostic: Use an OBD-II scanner to verify the P0128 code and confirm the thermostat is the issue.
  2. Coolant System Inspection: Check coolant levels, inspect for leaks, and ensure the system is properly pressurized.
  3. Thermostat Replacement: Replace the faulty thermostat with a new one that is compatible with the vehicle's make and model.
  4. Coolant Flush: Perform a coolant flush to remove any contaminants or air pockets in the system.
  5. System Test: After thermostat replacement, test the cooling system to ensure proper operation and temperature regulation.

Cost to Fix P0128 2009 Ford Fusion

The cost of repairing a P0128 code on a 2009 Ford Fusion can vary depending on the specific cause of the issue, the cost of parts, and labor rates in your area. On average, the cost of replacing a faulty thermostat and performing a coolant flush can range from $200 to $400. It is recommended to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on your vehicle's specific needs. Keep in mind that labor rates and diagnostic fees can also impact the overall cost of the repair.

What does this mean?

Tech Notes for P0128 2009 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.

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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 2009 Ford Fusion Code

1. What does OBDII code P0128 mean for a 2009 Ford Fusion?

- OBDII code P0128 on a 2009 Ford Fusion indicates a problem with the coolant thermostat, specifically that the engine is not reaching normal operating temperature within a specified time frame.

2. What are common symptoms of a P0128 code in a 2009 Ford Fusion?

- Common symptoms of a P0128 code on a 2009 Ford Fusion include the engine running colder than usual, a decrease in fuel efficiency, and the Check Engine light illuminating on the dashboard.

3. What are the possible causes of a P0128 code in a 2009 Ford Fusion?

- The most common causes of a P0128 code on a 2009 Ford Fusion are a faulty thermostat, a malfunctioning engine coolant temperature sensor, low coolant level, or a problem with the cooling system.

4. How can I diagnose a P0128 code on my 2009 Ford Fusion?

- To diagnose a P0128 code on a 2009 Ford Fusion, you can start by checking the coolant level, inspecting the thermostat for proper operation, testing the engine coolant temperature sensor, and examining the cooling system for any leaks or blockages.

5. Can I continue driving my 2009 Ford Fusion with a P0128 code?

- It is not recommended to continue driving your 2009 Ford Fusion with a P0128 code, as it can lead to decreased fuel efficiency, engine performance issues, and potential damage to the engine due to operating at lower temperatures.

6. How do I repair a P0128 code on my 2009 Ford Fusion?

- The most common repair for a P0128 code on a 2009 Ford Fusion is to replace the thermostat. Additionally, you may need to address any other underlying issues such as a faulty engine coolant temperature sensor or cooling system problems.

7. Can a DIY enthusiast fix a P0128 code on a 2009 Ford Fusion?

- While replacing the thermostat for a P0128 code on a 2009 Ford Fusion is a relatively straightforward task, diagnosing and fixing other potential issues may require more advanced automotive knowledge and tools. It is recommended to consult a professional mechanic for complex repairs.

8. How much does it cost to repair a P0128 code on a 2009 Ford Fusion?

- The cost to repair a P0128 code on a 2009 Ford Fusion can vary depending on the underlying issue and whether you choose to do the repair yourself or take it to a mechanic. Generally, the cost of replacing a thermostat ranges from $150 to $300.

9. Will resetting the OBDII code clear the P0128 code on a 2009 Ford Fusion?

- Resetting the OBDII code may temporarily clear the P0128 code on a 2009 Ford Fusion, but if the underlying issue causing the code is not addressed, the Check Engine light will likely reappear once the problem is detected again.

10. How often does a P0128 code occur in a 2009 Ford Fusion?

- A P0128 code in a 2009 Ford Fusion can occur due to various factors such as age, mileage, and maintenance history. It is not uncommon for this code to appear as the vehicle gets older and the cooling system components wear out.

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