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Engine-Codes – Nissan – P0128 2009 Nissan Altima Sedan

P0128 2009 Nissan Altima Sedan Code - Thermostat Function

Quick Answer

The P0128 diagnostic trouble code (DTC) in a 2009 Nissan Altima Sedan indicates an issue with the thermostat function in the vehicle. Common causes include Stuck open thermostat, Faulty coolant temperature sensor, Low coolant level. 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 Nissan Altima Sedan indicates Thermostat Function.
Common causes
Common causes include Stuck open thermostat, Faulty coolant temperature sensor, Low coolant level.
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 12, 2024
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Code P0128 2009 Nissan Altima Sedan Description

The P0128 diagnostic trouble code (DTC) in a 2009 Nissan Altima Sedan indicates an issue with the thermostat function in the vehicle. The thermostat is a crucial component of the engine cooling system, regulating the flow of coolant to help maintain optimal operating temperature. When the engine is running, the thermostat stays closed to allow it to warm up quickly. Once the engine reaches a certain temperature, the thermostat opens to allow coolant to flow through the radiator and cool the engine down.

OBDII Code P0128 2009 Nissan Altima Sedan - Thermostat Function
P0128 2009 Nissan Altima Sedan Code - Thermostat Function

Common Causes of P0128 2009 Nissan Altima Sedan

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

Symptoms of P0128 2009 Nissan Altima Sedan

  1. Engine running colder than normal
  2. Decreased fuel efficiency
  3. Engine overheating
  4. Check Engine Light illuminated

How to Fix P0128 2009 Nissan Altima Sedan

  1. Diagnostic Testing: Use a scan tool to retrieve the specific code and perform diagnostic tests to confirm the issue with the thermostat.
  2. Thermostat Replacement: Replace the faulty thermostat with a new one to restore proper function.
  3. Coolant Flush: Flush the cooling system to remove any contaminants and ensure proper coolant flow.
  4. Coolant Temperature Sensor Replacement: If the sensor is faulty, replace it with a new one to provide accurate temperature readings.
  5. System Check: After repairs, perform a system check to ensure the thermostat is functioning correctly and the engine is operating at the correct temperature.

Cost to Fix P0128 2009 Nissan Altima Sedan

The cost of repairing a thermostat issue in a 2009 Nissan Altima Sedan can vary depending on the specific cause of the problem and the labor rates in your area. On average, the cost of parts for a thermostat replacement can range from $50 to $200, while labor costs can range from $100 to $300. Overall, you can expect to pay between $150 and $500 for the repair, including parts and labor. It's important to note that these are general estimates, and actual costs may vary based on your location and the specific circumstances of the repair. It is advisable to consult with a trusted mechanic or auto repair shop for a more accurate cost estimate.

What does this mean?

Tech Notes for P0128 2009 Nissan Altima Sedan

If cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem.

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 Nissan Altima Sedan Code

1. What does OBDII code P0128 mean for a 2009 Nissan Altima Sedan?

- The P0128 code indicates that the engine coolant temperature is not reaching the expected level within a specified time after starting the engine.

2. What are the common symptoms of a P0128 code in a 2009 Nissan Altima Sedan?

- Common symptoms include the engine running colder than normal, poor fuel economy, lack of heat from the heater, and potential Check Engine Light illumination.

3. What are the possible causes of a P0128 code in a 2009 Nissan Altima Sedan?

- The code can be triggered by a faulty thermostat, low coolant level, a malfunctioning coolant temperature sensor, or issues with the cooling system.

4. How does the thermostat function in a 2009 Nissan Altima Sedan?

- The thermostat regulates the flow of coolant through the engine by opening and closing based on the engine's operating temperature, helping to maintain optimal engine temperature.

5. What should I do if my 2009 Nissan Altima Sedan shows a P0128 code?

- It is recommended to have the thermostat, coolant temperature sensor, and cooling system inspected by a qualified mechanic to determine the exact cause of the code.

6. Can I continue driving my 2009 Nissan Altima Sedan with a P0128 code?

- It is not advisable to ignore the P0128 code, as driving with a malfunctioning thermostat can lead to overheating, engine damage, and potential costly repairs.

7. How can I prevent the recurrence of a P0128 code in my 2009 Nissan Altima Sedan?

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

8. Is it possible to reset the P0128 code in a 2009 Nissan Altima Sedan without fixing the issue?

- While clearing the code may temporarily turn off the Check Engine Light, it is crucial to address the underlying problem to prevent further damage to the engine.

9. How much does it typically cost to repair a P0128 code in a 2009 Nissan Altima Sedan?

- The cost of repairing a P0128 code can vary depending on the exact cause, but it generally involves replacing the thermostat, which can range from $150 to $300 including parts and labor.

10. Can a DIY enthusiast replace the thermostat to fix the P0128 code in a 2009 Nissan Altima Sedan?

- While replacing the thermostat is a relatively straightforward job, it is recommended to have it done by a professional mechanic to ensure proper installation and avoid potential complications.

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