AutoCodes – Nissan – P0128 2012 Nissan Sentra

P0128 2012 Nissan Sentra 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 Sentra 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 5,321

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

What does this mean?

What are the Possible Causes of the DTC P0128 2012 Nissan Sentra?

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 Sentra?

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

Check for coolant leaks first, if there are no leaks check to see if thermostat is opening and closing properly if its not replace thermostat if problem is still there coolant temperature sensor may need to be replaced.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0128 2012 Nissan Sentra 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 2012 Nissan Sentra 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 2012 Nissan Sentra Code

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

The OBDII code P0128 on a 2012 Nissan Sentra indicates a problem with the thermostat's function, specifically that the engine is not reaching its proper operating temperature within the expected time frame.

2. What are the common symptoms of a P0128 code in a 2012 Nissan Sentra?

Common symptoms of a P0128 code in a 2012 Nissan Sentra may include the engine running colder than normal, poor fuel economy, a lack of heat from the heater, and potentially an illuminated check engine light.

3. What are the possible causes of an OBDII code P0128 on a 2012 Nissan Sentra?

Possible causes of a P0128 code on a 2012 Nissan Sentra include a faulty thermostat, a malfunctioning coolant temperature sensor, low coolant levels, or issues with the engine's cooling system.

4. How can I diagnose the cause of a P0128 code on my 2012 Nissan Sentra?

To diagnose the cause of a P0128 code on a 2012 Nissan Sentra, you can start by checking the coolant level, testing the thermostat, inspecting the coolant temperature sensor, and ensuring there are no leaks in the cooling system.

5. Can I continue driving my 2012 Nissan Sentra with a P0128 code?

It is not recommended to continue driving your 2012 Nissan Sentra with a P0128 code, as it can lead to poor engine performance, reduced fuel efficiency, and potential damage to engine components over time.

6. How can I repair a P0128 code on my 2012 Nissan Sentra?

To repair a P0128 code on a 2012 Nissan Sentra, you may need to replace the thermostat, coolant temperature sensor, or address any issues with the cooling system such as leaks or blockages.

7. Will resetting the check engine light make the P0128 code go away on a 2012 Nissan Sentra?

Resetting the check engine light may temporarily clear the P0128 code on a 2012 Nissan Sentra, but if the underlying issue causing the code is not addressed, the code is likely to reappear.

8. Is it safe to ignore a P0128 code on a 2012 Nissan Sentra?

Ignoring a P0128 code on a 2012 Nissan Sentra is not recommended, as it can lead to potential engine overheating, reduced fuel efficiency, and other serious issues that can impact the vehicle's performance and longevity.

9. How much does it typically cost to repair a P0128 code on a 2012 Nissan Sentra?

The cost to repair a P0128 code on a 2012 Nissan Sentra can vary depending on the specific cause of the issue, but it may range from around $100 to $300 or more, including parts and labor.

10. Can a DIY enthusiast fix a P0128 code on a 2012 Nissan Sentra?

A DIY enthusiast with the necessary tools and mechanical knowledge may be able to address a P0128 code on a 2012 Nissan Sentra by replacing the thermostat or coolant temperature sensor, but more complex issues may require professional assistance.