AutoCodes – Nissan – P0128 2012 Nissan Pathfinder

P0128 2012 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 2012 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 5,369

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 2012 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 2012 Nissan Pathfinder - Thermostat Function - AutoCodes.com — P0128 2012 Nissan Pathfinder Code - Thermostat Function

What does this mean?

What are the Possible Causes of the DTC P0128 2012 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 2012 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 2012 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 2012 Nissan Pathfinder Code

1. What does OBDII code P0128 on a 2012 Nissan Pathfinder indicate?

- OBDII code P0128 in a 2012 Nissan Pathfinder typically indicates a problem with the thermostat function.

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

- Common symptoms of a P0128 error code in a Nissan Pathfinder may include the engine running colder than normal, poor fuel economy, and the check engine light coming on.

3. What are the possible causes of a P0128 error code in a 2012 Nissan Pathfinder?

- Possible causes of a P0128 error code in a 2012 Nissan Pathfinder include a malfunctioning thermostat, low coolant levels, a faulty coolant temperature sensor, or a problem with the cooling system.

4. How serious is a P0128 error code in a Nissan Pathfinder?

- While a P0128 error code may not cause immediate harm to your vehicle, it can lead to reduced fuel efficiency, increased emissions, and potential engine damage if left unresolved.

5. How can I diagnose and repair a P0128 error code in my 2012 Nissan Pathfinder?

- To diagnose and repair a P0128 error code in your 2012 Nissan Pathfinder, you may need to check the coolant level, inspect the thermostat, test the coolant temperature sensor, and ensure the cooling system is functioning properly.

6. Can I drive my Nissan Pathfinder with a P0128 error code?

- It is generally not recommended to drive your Nissan Pathfinder with a P0128 error code, as it can lead to poor engine performance and potential overheating issues.

7. How much does it cost to fix a P0128 error code in a Nissan Pathfinder?

- The cost to fix a P0128 error code in a Nissan Pathfinder can vary depending on the underlying issue, but it may involve replacing the thermostat, coolant temperature sensor, or other components in the cooling system.

8. How often should the thermostat be replaced in a 2012 Nissan Pathfinder?

- The thermostat in a 2012 Nissan Pathfinder should be replaced as part of regular maintenance or if it is found to be faulty during diagnostics for a P0128 error code.

9. Can a DIY enthusiast fix a P0128 error code in a Nissan Pathfinder?

- Depending on your automotive repair skills, you may be able to address a P0128 error code in your Nissan Pathfinder by following repair guides, but it is recommended to consult a professional if you are unsure.

10. Are there any preventive measures to avoid a P0128 error code in a Nissan Pathfinder?

- To prevent a P0128 error code in a Nissan Pathfinder, regularly check coolant levels, maintain the cooling system, and address any issues with the thermostat promptly to ensure proper engine temperature regulation.