AutoCodes – Nissan – P0128 2009 Nissan Altima Sedan

P0128 2009 Nissan Altima Sedan Code - Thermostat Function

Quick Answer

The thermostat is a component that blocks the flow of coolant to the radiator until the engine has warmed up. Common causes include Leaking or stuck open thermostat, Low engine coolant level, Insufficient warm up time. 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 Leaking or stuck open thermostat, Low engine coolant level, Insufficient warm up time.
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 14,744

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 Apr 21, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0128 2009 Nissan Altima Sedan Description

The thermostat is a component that blocks the flow of coolant to the radiator until the engine has warmed up. When the engine is cold, no coolant flows through the engine. Once the engine reaches its operating temperature, the thermostat opens. The OBDII sets when the engine coolant temperature has not risen enough to open the thermostat even though the engine has run long enough. This is due to a leak in the seal or the thermostat open stuck.

OBDII Code P0128 2009 Nissan Altima Sedan - Thermostat Function - AutoCodes.com — P0128 2009 Nissan Altima Sedan Code - Thermostat Function

What does this mean?

What are the Possible Causes of the DTC P0128 2009 Nissan Altima Sedan?

Leaking or stuck open thermostat
Low engine coolant level
Insufficient warm up time
Faulty engine coolant temperature sensor
Engine coolant temperature sensor harness is open or shorted
Engine coolant temperature sensor circuit poor electrical connection

How to Fix the DTC P0128 2009 Nissan Altima Sedan?

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

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0128 2009 Nissan Altima Sedan 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.

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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.