AutoCodes – Ford – P0128 2012 Ford Fusion

P0128 2012 Ford Fusion Code - Coolant Thermostat

Quick Answer

Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine. Common causes include Low engine coolant level, Faulty Engine Coolant Temperature (ECT) sensor or cylinder head temp (CHT) sensor, Faulty engine coolant thermostat. 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 2012 Ford Fusion indicates Coolant Thermostat.
Common causes: Common causes include Low engine coolant level, Faulty Engine Coolant Temperature (ECT) sensor or cylinder head temp (CHT) sensor, Faulty engine coolant thermostat.
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 5,815

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 Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0128 2012 Ford Fusion Description

Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.

OBDII Code P0128 2012 Ford Fusion - Coolant Thermostat - AutoCodes.com — P0128 2012 Ford Fusion Code - Coolant Thermostat

What does this mean?

What are the Possible Causes of the DTC P0128 2012 Ford Fusion?

Low engine coolant level
Faulty Engine Coolant Temperature (ECT) sensor or cylinder head temp (CHT) sensor
Faulty engine coolant thermostat
Engine Coolant Temperature (ECT) sensor or cylinder head temp (CHT) sensor harness is open or shorted
Engine Coolant Temperature (ECT) sensor or cylinder head temp (CHT) sensor circuit poor electrical connection

How to Fix the DTC P0128 2012 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, 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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0128 2012 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.

Need more information about the P0128 2012 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 2012 Ford Fusion Code

1. What does OBDII code P0128 mean on a 2012 Ford Fusion?

- OBDII code P0128 on a 2012 Ford Fusion indicates a problem with the coolant thermostat.

2. What are common symptoms of a P0128 code on a 2012 Ford Fusion?

- Common symptoms include the engine running cooler than normal, poor fuel economy, and the check engine light coming on.

3. What causes the P0128 code to trigger on a 2012 Ford Fusion?

- The P0128 code is often triggered by a thermostat that is stuck open or is not functioning properly, leading to insufficient coolant temperature.

4. How serious is the P0128 code on a 2012 Ford Fusion?

- While the P0128 code may not cause immediate damage, it can lead to decreased fuel efficiency and engine performance if left unresolved.

5. Can I continue driving my 2012 Ford Fusion with a P0128 code?

- It is generally not recommended to continue driving with a P0128 code, as it can affect the overall performance of the vehicle and potentially lead to more serious issues.

6. How can I diagnose a P0128 code on my 2012 Ford Fusion?

- Diagnosis typically involves checking the coolant level, inspecting the thermostat, and testing the coolant temperature sensor using a scan tool.

7. What is the repair process for a P0128 code on a 2012 Ford Fusion?

- The repair process usually involves replacing the thermostat, ensuring the coolant system is functioning properly, and clearing the code with a scan tool.

8. Are there any DIY tips for fixing a P0128 code on a 2012 Ford Fusion?

- While some may attempt to replace the thermostat themselves, it is recommended to consult a professional mechanic for accurate diagnosis and repair.

9. How much does it cost to fix a P0128 code on a 2012 Ford Fusion?

- The cost of fixing a P0128 code can vary depending on the extent of the issue, but it typically ranges from $150 to $400 for parts and labor.

10. How can I prevent the P0128 code from reoccurring on my 2012 Ford Fusion?

- Regular maintenance of the cooling system, including timely thermostat replacement and coolant flushes, can help prevent the recurrence of the P0128 code.