AutoCodes – Nissan – P0128 2007 Nissan Sentra

P0128 2007 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 2007 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 6,783

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 2007 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 2007 Nissan Sentra - Thermostat Function - AutoCodes.com — P0128 2007 Nissan Sentra Code - Thermostat Function

What does this mean?

What are the Possible Causes of the DTC P0128 2007 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 2007 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 2007 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 2007 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 2007 Nissan Sentra Code

1. What does OBDII code P0128 on a 2007 Nissan Sentra indicate?

Code P0128 indicates that the engine coolant temperature is below the thermostat regulating temperature.

2. What are common symptoms of a P0128 code in a 2007 Nissan Sentra?

Common symptoms include the engine running colder than usual, poor fuel economy, and the Check Engine light illuminating.

3. What are possible causes of a P0128 code in a 2007 Nissan Sentra?

Potential causes include a faulty thermostat, low coolant level, a malfunctioning coolant temperature sensor, or a stuck open thermostat.

4. How can I diagnose the cause of a P0128 code in my 2007 Nissan Sentra?

A diagnostic scan tool can help monitor the coolant temperature sensor's readings and determine if the thermostat is functioning properly.

5. Can I still drive my 2007 Nissan Sentra with a P0128 code?

It is not recommended to drive with a P0128 code as it can lead to inefficient engine performance and potential long-term damage.

6. How can I repair a P0128 code on my 2007 Nissan Sentra?

Repair options include replacing the thermostat, checking and topping up coolant levels, and inspecting the coolant temperature sensor for any issues.

7. Is it possible to reset the P0128 code in a 2007 Nissan Sentra without fixing the underlying issue?

Resetting the code without addressing the root cause will likely result in the Check Engine light returning once the issue is detected again.

8. Can a P0128 code in a 2007 Nissan Sentra be triggered by a faulty coolant temperature sensor?

Yes, a malfunctioning coolant temperature sensor can send incorrect readings to the engine control unit, leading to a P0128 code.

9. How long does it typically take to repair a P0128 code on a 2007 Nissan Sentra?

Depending on the exact cause, repairing a P0128 code can take anywhere from 30 minutes to a couple of hours, including diagnosis and part replacement.

10. What are the long-term effects of ignoring a P0128 code on a 2007 Nissan Sentra?

Ignoring a P0128 code can result in reduced fuel efficiency, engine overheating, and potential damage to engine components due to operating outside of the optimal temperature range.