AutoCodes – Nissan – P0128 2009 Nissan Sentra

P0128 2009 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 2009 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 3,547

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 2009 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 2009 Nissan Sentra - Thermostat Function - AutoCodes.com — P0128 2009 Nissan Sentra Code - Thermostat Function

What does this mean?

What are the Possible Causes of the DTC P0128 2009 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 2009 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 2009 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 2009 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 2009 Nissan Sentra Code

1. What does OBDII code P0128 on a 2009 Nissan Sentra indicate?

- OBDII code P0128 in a 2009 Nissan Sentra typically points to an issue with the thermostat.

2. What are the common symptoms of a P0128 code in a 2009 Nissan Sentra?

- Common symptoms include the engine running cooler than normal, a decrease in fuel efficiency, and a possible check engine light.

3. What causes the P0128 code to appear in a 2009 Nissan Sentra?

- The most common cause of a P0128 code is a malfunctioning thermostat that is stuck open or not working properly.

4. How can I diagnose a P0128 code in my 2009 Nissan Sentra?

- Diagnosing a P0128 code usually involves checking the coolant level, inspecting the thermostat, and testing the temperature sensor.

5. Can a faulty thermostat cause other issues in a 2009 Nissan Sentra besides triggering the P0128 code?

- Yes, a faulty thermostat can lead to poor engine performance, overheating, and potential damage to the engine if not addressed promptly.

6. What are some repair tips for fixing a P0128 code in a 2009 Nissan Sentra?

- Repair tips include replacing the thermostat, ensuring proper coolant levels, and checking for any leaks in the cooling system.

7. Is it safe to continue driving my 2009 Nissan Sentra with a P0128 code?

- It is not recommended to drive with a P0128 code as it can lead to overheating issues and potentially cause damage to the engine.

8. How much does it typically cost to repair a P0128 code in a 2009 Nissan Sentra?

- The cost of repairing a P0128 code can vary depending on the extent of the issue, but it generally ranges from $150 to $300 for parts and labor.

9. Can I reset the P0128 code in my 2009 Nissan Sentra on my own?

- You can reset the code using an OBDII scanner, but it is important to address the underlying issue causing the code to prevent it from reoccurring.

10. How often should the thermostat be replaced in a 2009 Nissan Sentra to prevent a P0128 code?

- Thermostats typically last for several years, but it is recommended to replace them every 50,000 to 100,000 miles as part of regular maintenance to prevent issues like the P0128 code.