AutoCodes – Nissan – P0128 2007 Nissan Pathfinder

P0128 2007 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 2007 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 6,025

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 2007 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 2007 Nissan Pathfinder - Thermostat Function - AutoCodes.com — P0128 2007 Nissan Pathfinder Code - Thermostat Function

What does this mean?

What are the Possible Causes of the DTC P0128 2007 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 2007 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 2007 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.

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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 2007 Nissan Pathfinder Code

1. What does OBDII code P0128 on a 2007 Nissan Pathfinder indicate?

- The P0128 code indicates that the engine coolant temperature is below the thermostat regulating temperature.

2. What are the common symptoms of a P0128 code in a 2007 Nissan Pathfinder?

- Common symptoms include a slow-to-warm-up engine, low heat from the heater, and possibly an illuminated check engine light.

3. What are the possible causes of a P0128 code in a 2007 Nissan Pathfinder?

- The common causes include a faulty thermostat, low coolant level, a malfunctioning coolant temperature sensor, or a stuck open thermostat.

4. How can I diagnose the P0128 code in my 2007 Nissan Pathfinder?

- You can start by checking the coolant level, inspecting the thermostat for proper operation, and testing the coolant temperature sensor for accuracy.

5. Can I drive my 2007 Nissan Pathfinder with a P0128 code?

- It is not recommended to drive with a P0128 code as it can lead to reduced fuel efficiency, engine performance issues, and potential damage to the engine.

6. How do I repair a P0128 code on a 2007 Nissan Pathfinder?

- The most common repair involves replacing the thermostat with a new one, ensuring it is the correct temperature rating for your vehicle.

7. Is it possible to reset the P0128 code on a 2007 Nissan Pathfinder without making any repairs?

- While you can clear the code temporarily, it is essential to address the underlying issue to prevent further problems.

8. Can a P0128 code in a 2007 Nissan Pathfinder affect the vehicle's emissions?

- Yes, a P0128 code can impact emissions by causing the engine to run at an incorrect temperature, potentially leading to increased emissions.

9. How long does it typically take to repair a P0128 code on a 2007 Nissan Pathfinder?

- The repair time can vary depending on the exact cause of the code, but replacing a thermostat usually takes around 1-2 hours.

10. Are there any preventive maintenance tips to avoid a P0128 code in a 2007 Nissan Pathfinder?

- Regularly check and maintain the cooling system, change the coolant at recommended intervals, and address any temperature-related issues promptly to prevent a P0128 code.