AutoCodes – Nissan – P0128 2010 Nissan Pathfinder

P0128 2010 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 2010 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 4,914

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 2010 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 2010 Nissan Pathfinder - Thermostat Function - AutoCodes.com — P0128 2010 Nissan Pathfinder Code - Thermostat Function

What does this mean?

What are the Possible Causes of the DTC P0128 2010 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 2010 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 2010 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 2010 Nissan Pathfinder Code

1. What does OBDII code P0128 in a 2010 Nissan Pathfinder indicate?

- OBDII code P0128 in a 2010 Nissan Pathfinder indicates a potential issue with the thermostat function.

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

- Common symptoms of a P0128 code in a Nissan Pathfinder include the engine running colder than normal, a decrease in fuel efficiency, and the check engine light illuminating.

3. What causes the P0128 code to trigger in a 2010 Nissan Pathfinder?

- The P0128 code in a 2010 Nissan Pathfinder is typically triggered by a thermostat that is stuck open or is not functioning properly.

4. How does a malfunctioning thermostat affect the engine in a Nissan Pathfinder?

- A malfunctioning thermostat in a Nissan Pathfinder can cause the engine to run too cool, leading to reduced fuel efficiency, poor performance, and potential damage due to incomplete combustion.

5. Can a P0128 code be triggered by a faulty coolant temperature sensor in a Nissan Pathfinder?

- Yes, a faulty coolant temperature sensor can sometimes trigger a P0128 code in a Nissan Pathfinder if it sends incorrect signals to the engine control module.

6. What are some DIY repair tips for addressing a P0128 code in a 2010 Nissan Pathfinder?

- DIY repair tips for addressing a P0128 code in a Nissan Pathfinder include checking and potentially replacing the thermostat, ensuring the coolant level is adequate, and verifying proper operation of the coolant temperature sensor.

7. How critical is it to address a P0128 code in a Nissan Pathfinder promptly?

- It is important to address a P0128 code in a Nissan Pathfinder promptly to prevent potential engine overheating, reduced fuel efficiency, and further damage to engine components.

8. Can a P0128 code in a Nissan Pathfinder be reset without addressing the underlying issue?

- While it is possible to reset a P0128 code in a Nissan Pathfinder, it is crucial to address the underlying issue causing the code to prevent recurring problems.

9. What is the typical cost of repairing a P0128 code in a 2010 Nissan Pathfinder at a mechanic or dealership?

- The cost of repairing a P0128 code in a 2010 Nissan Pathfinder at a mechanic or dealership can vary but generally ranges from $150 to $400, depending on the specific repairs needed.

10. How can regular maintenance help prevent the recurrence of a P0128 code in a Nissan Pathfinder?

- Regular maintenance, including timely replacement of the thermostat, coolant flushes, and monitoring coolant levels, can help prevent the recurrence of a P0128 code in a Nissan Pathfinder.