AutoCodes – Nissan – P0128 2008 Nissan Pathfinder

P0128 2008 Nissan Pathfinder 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 Pathfinder 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 5,589

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 Pathfinder 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 Pathfinder - Thermostat Function - AutoCodes.com — P0128 2008 Nissan Pathfinder Code - Thermostat Function

What does this mean?

What are the Possible Causes of the DTC P0128 2008 Nissan Pathfinder?

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 Pathfinder?

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 Pathfinder 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 Pathfinder 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 Pathfinder Code

1. What does OBDII code P0128 on a 2008 Nissan Pathfinder indicate?

The P0128 code typically indicates a problem with the thermostat in the vehicle's cooling system.

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

Common symptoms include the temperature gauge reading lower than normal, the engine taking longer to reach operating temperature, and a decrease in fuel efficiency.

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

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

4. How can I diagnose the issue causing a P0128 code on my 2008 Nissan Pathfinder?

Diagnosing the issue may involve checking the coolant level, inspecting the thermostat, testing the engine coolant temperature sensor, and ensuring proper operation of the cooling system components.

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

It is not recommended to drive the vehicle with a P0128 code for an extended period as it can lead to overheating and potential engine damage. It is best to address the issue promptly.

6. How can I repair a P0128 code on a 2008 Nissan Pathfinder?

Repairing a P0128 code may involve replacing the thermostat, topping up coolant levels, replacing the engine coolant temperature sensor, or addressing any other underlying cooling system issues.

7. Are there any DIY tips for fixing a P0128 code on a 2008 Nissan Pathfinder?

While some basic maintenance tasks like checking coolant levels can be done by DIY enthusiasts, it is recommended to consult a professional mechanic for accurate diagnosis and repair of the issue.

8. Is it necessary to reset the OBDII code after repairing a P0128 issue on a 2008 Nissan Pathfinder?

Yes, it is important to reset the OBDII code after completing the necessary repairs to clear the fault code and ensure proper monitoring of the vehicle's performance.

9. How long does it typically take to repair a P0128 code on a 2008 Nissan Pathfinder?

The repair time can vary depending on the specific cause of the issue. Simple fixes like topping up coolant may take a short time, while replacing a faulty thermostat or sensor may require more extensive work.

10. Can a P0128 code on a 2008 Nissan Pathfinder be prevented in the future?

Regular maintenance of the cooling system, timely replacement of coolant and thermostat, and addressing any issues promptly can help prevent the recurrence of a P0128 code in the future.