AutoCodes – Nissan – P0128 2012 Nissan Altima Sedan

P0128 2012 Nissan Altima Sedan 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 Altima Sedan 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 7,825

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 Altima Sedan 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 Altima Sedan - Thermostat Function - AutoCodes.com — P0128 2012 Nissan Altima Sedan Code - Thermostat Function

What does this mean?

What are the Possible Causes of the DTC P0128 2012 Nissan Altima Sedan?

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 Altima Sedan?

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 Altima Sedan 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 Altima Sedan 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 Altima Sedan Code

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

- OBDII code P0128 in a 2012 Nissan Altima Sedan points to an issue with the thermostat function.

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

- Common symptoms of a P0128 code in a 2012 Nissan Altima Sedan include the engine running colder than normal, a decrease in fuel efficiency, and the Check Engine light illuminating.

3. What are the possible causes of a P0128 code in a 2012 Nissan Altima Sedan?

- Possible causes of a P0128 code in a 2012 Nissan Altima Sedan include a faulty thermostat, a malfunctioning coolant temperature sensor, or low coolant levels.

4. How can I diagnose the cause of a P0128 code in my 2012 Nissan Altima Sedan?

- To diagnose a P0128 code in a 2012 Nissan Altima Sedan, you can start by checking the coolant level, inspecting the thermostat for proper operation, and testing the coolant temperature sensor.

5. What are the potential dangers of ignoring a P0128 code in a 2012 Nissan Altima Sedan?

- Ignoring a P0128 code in a 2012 Nissan Altima Sedan can lead to overheating of the engine, which may cause severe damage and result in costly repairs.

6. Can I continue driving my 2012 Nissan Altima Sedan with a P0128 code?

- It is not recommended to continue driving your 2012 Nissan Altima Sedan with a P0128 code as it can lead to engine overheating and potential damage.

7. How much does it typically cost to repair a P0128 code in a 2012 Nissan Altima Sedan?

- The cost to repair a P0128 code in a 2012 Nissan Altima Sedan can vary depending on the exact cause, but it may range from $150 to $400 for parts and labor.

8. Is it possible to reset a P0128 code in a 2012 Nissan Altima Sedan without fixing the underlying issue?

- While you can clear the code temporarily, the Check Engine light is likely to reappear until the root cause of the P0128 code is addressed.

9. Are there any preventative maintenance tips to avoid a P0128 code in a 2012 Nissan Altima Sedan?

- Regularly checking and maintaining the coolant level, replacing the thermostat at recommended intervals, and ensuring the cooling system is in good condition can help prevent a P0128 code in your 2012 Nissan Altima Sedan.

10. Can a DIY enthusiast repair a P0128 code in a 2012 Nissan Altima Sedan?

- Depending on your mechanical skills and tools available, DIY enthusiasts may be able to replace a faulty thermostat or coolant temperature sensor to address a P0128 code in a 2012 Nissan Altima Sedan. However, it's recommended to consult a professional if unsure.