AutoCodes – Nissan – P0128 2008 Nissan Sentra

P0128 2008 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 2008 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 4,666

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 2008 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 2008 Nissan Sentra - Thermostat Function - AutoCodes.com — P0128 2008 Nissan Sentra Code - Thermostat Function

What does this mean?

What are the Possible Causes of the DTC P0128 2008 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 2008 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 2008 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 2008 Nissan Sentra code?

Need more information on how to fix the P0128 2008 Nissan Sentra code? Get Access to Factory Service Manuals

Need Help with the 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 2008 Nissan Sentra Code

1. What does the OBDII code P0128 for a 2008 Nissan Sentra indicate?

This code typically indicates a problem with the thermostat in the engine cooling system.

2. What are common symptoms associated with the P0128 code in a 2008 Nissan Sentra?

Common symptoms include the engine running colder than normal, a noticeable drop in fuel efficiency, and the Check Engine light being illuminated on the dashboard.

3. What are the possible causes of the P0128 code in a 2008 Nissan Sentra?

The main causes can include a faulty thermostat, a malfunctioning coolant temperature sensor, low coolant levels, or a problem with the engine's computer system.

4. How does a faulty thermostat affect the performance of a 2008 Nissan Sentra?

A faulty thermostat can lead to inefficient engine operation, poor fuel economy, increased emissions, and potential overheating issues if not addressed promptly.

5. Can I continue driving my 2008 Nissan Sentra with the P0128 code present?

It is not recommended to continue driving with the P0128 code active, as it can lead to further engine damage and decreased performance.

6. How can I diagnose and repair the P0128 code in my 2008 Nissan Sentra?

Diagnosis typically involves checking the thermostat, coolant levels, temperature sensor, and related components. Repair may involve replacing the thermostat, addressing coolant leaks, or fixing sensor issues.

7. Will resetting the Check Engine light make the P0128 code disappear?

Resetting the Check Engine light may temporarily turn it off, but the underlying issue causing the P0128 code will likely persist until properly diagnosed and repaired.

8. How important is it to address the P0128 code promptly in a 2008 Nissan Sentra?

It is essential to address the P0128 code promptly to prevent potential engine damage, ensure optimal fuel efficiency, and maintain the overall performance of the vehicle.

9. Are there any preventive maintenance tips to avoid encountering the P0128 code in a 2008 Nissan Sentra?

Regularly checking and maintaining the cooling system, monitoring coolant levels, and ensuring timely thermostat replacement can help prevent the occurrence of the P0128 code.

10. Can a DIY enthusiast with basic automotive knowledge repair the P0128 code in a 2008 Nissan Sentra?

While some aspects of diagnosing and repairing the P0128 code can be tackled by a DIY enthusiast, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair to ensure the issue is resolved effectively.