AutoCodes – Nissan – P0128 2011 Nissan Pathfinder

P0128 2011 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 2011 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 5,103

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 2011 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 2011 Nissan Pathfinder - Thermostat Function - AutoCodes.com — P0128 2011 Nissan Pathfinder Code - Thermostat Function

What does this mean?

What are the Possible Causes of the DTC P0128 2011 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 2011 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 2011 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 2011 Nissan Pathfinder Code

1. What does OBDII code P0128 on a 2011 Nissan Pathfinder indicate?

- OBDII code P0128 in a 2011 Nissan Pathfinder typically indicates an issue with the thermostat.

2. What are the common symptoms of a P0128 code on a 2011 Nissan Pathfinder?

- Common symptoms include the engine running colder than normal, decreased fuel efficiency, and the check engine light being illuminated on the dashboard.

3. What are the possible causes of a P0128 code on a 2011 Nissan Pathfinder?

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

4. How can I diagnose the cause of a P0128 code on my 2011 Nissan Pathfinder?

- To diagnose the issue, you can check the coolant level, inspect the thermostat for proper operation, test the coolant temperature sensor, and examine the cooling system for any leaks or blockages.

5. Can I continue driving my 2011 Nissan Pathfinder with a P0128 code?

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

6. How can I repair a P0128 code on my 2011 Nissan Pathfinder?

- Repairing a P0128 code typically involves replacing the thermostat, ensuring proper coolant levels, checking and replacing the coolant temperature sensor if needed, and inspecting the cooling system for any issues.

7. Will resetting the check engine light make the P0128 code go away?

- Resetting the check engine light may temporarily turn off the light, but it will not fix the underlying issue causing the P0128 code. It's important to diagnose and address the problem to prevent further issues.

8. How much does it cost to repair a P0128 code on a 2011 Nissan Pathfinder?

- The cost of repairing a P0128 code can vary depending on the exact cause of the issue, but it typically ranges from $150 to $400, including parts and labor.

9. What happens if I ignore a P0128 code on my 2011 Nissan Pathfinder?

- Ignoring a P0128 code can lead to decreased fuel efficiency, potential engine overheating, and possible damage to engine components. It's crucial to address the issue promptly to prevent further problems.

10. Can I fix a P0128 code on my 2011 Nissan Pathfinder myself?

- If you have experience with automotive repairs and the necessary tools, you may be able to fix a P0128 code yourself by following repair guides or tutorials. However, if you're unsure, it's best to consult a professional mechanic.