AutoCodes – Nissan – P0128 2008 Nissan Altima Sedan

P0128 2008 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 2008 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 13,360

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 2008 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 2008 Nissan Altima Sedan - Thermostat Function - AutoCodes.com — P0128 2008 Nissan Altima Sedan Code - Thermostat Function

What does this mean?

What are the Possible Causes of the DTC P0128 2008 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 2008 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 2008 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.

Need more information about the P0128 2008 Nissan Altima Sedan 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 2008 Nissan Altima Sedan Code

1. What does OBDII code P0128 for a 2008 Nissan Altima Sedan indicate?

This code indicates that the engine coolant temperature is below the thermostat regulating temperature for too long.

2. What are the common symptoms of a P0128 code in a 2008 Nissan Altima?

Common symptoms include a slow-to-warm-up engine, low coolant levels, poor fuel economy, and possibly a check engine light.

3. What are the possible causes of a P0128 code in a 2008 Nissan Altima?

Possible causes include a faulty thermostat, low coolant levels, a malfunctioning coolant temperature sensor, or a problem with the cooling system.

4. How can I diagnose the cause of a P0128 code in my 2008 Nissan Altima?

Diagnosis typically involves checking the coolant level, inspecting the thermostat, testing the coolant temperature sensor, and ensuring the cooling system is functioning properly.

5. Can I continue driving my 2008 Nissan Altima with a P0128 code?

It is not recommended to ignore a P0128 code, as it can lead to potential engine damage or overheating issues. It is best to address the issue promptly.

6. How can I repair a P0128 code in my 2008 Nissan Altima?

Repairing a P0128 code usually involves replacing the thermostat, topping up coolant levels, checking the cooling system for leaks, and verifying proper sensor operation.

7. Is it possible to reset the P0128 code in a 2008 Nissan Altima without fixing the issue?

While you can clear the code using an OBDII scanner, it will likely reappear if the underlying issue is not addressed.

8. Can a DIY enthusiast fix a P0128 code in a 2008 Nissan Altima?

Depending on your skill level, you may be able to replace the thermostat or top up coolant levels yourself. However, more complex issues may require professional assistance.

9. How much does it cost to repair a P0128 code in a 2008 Nissan Altima?

The cost of repair can vary based on the specific issue causing the code, but replacing a thermostat or addressing coolant leaks may range from $150 to $400 at a repair shop.

10. How often does the thermostat in a 2008 Nissan Altima need to be replaced?

Thermostats typically last for several years, but if you encounter a P0128 code or notice cooling system issues, it may be time to replace the thermostat in your 2008 Nissan Altima.