AutoCodes – Nissan – P0128 2003 Nissan Altima Sedan

P0128 2003 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 2003 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 10,430

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 Mar 30, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0128 2003 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 2003 Nissan Altima Sedan - Thermostat Function - AutoCodes.com — P0128 2003 Nissan Altima Sedan Code - Thermostat Function

What does this mean?

What are the Possible Causes of the DTC P0128 2003 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 2003 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 2003 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 2003 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 2003 Nissan Altima Sedan Code

1. What does the OBDII code P0128 on a 2003 Nissan Altima Sedan indicate?

The OBDII code P0128 on a 2003 Nissan Altima Sedan indicates a malfunction in the thermostat function, specifically pointing to a low coolant temperature.

2. What are the common symptoms associated with the P0128 code in a 2003 Nissan Altima Sedan?

Common symptoms of the P0128 code in a 2003 Nissan Altima Sedan include slow engine warm-up, decreased fuel efficiency, and the inability of the heater to produce hot air.

3. What are the potential causes of the P0128 code on a 2003 Nissan Altima Sedan?

The potential causes of the P0128 code on a 2003 Nissan Altima Sedan include a faulty thermostat, low coolant level, a malfunctioning coolant temperature sensor, or issues with the cooling system.

4. How can I diagnose the P0128 code on my 2003 Nissan Altima Sedan?

To diagnose the P0128 code on a 2003 Nissan Altima Sedan, you can start by checking the coolant level, inspecting the thermostat for proper operation, testing the coolant temperature sensor, and ensuring there are no leaks in the cooling system.

5. Can I continue driving my 2003 Nissan Altima Sedan with the P0128 code?

It is not recommended to continue driving your 2003 Nissan Altima Sedan with the P0128 code, as it can lead to potential engine damage due to improper temperature regulation.

6. How can I repair the P0128 code on my 2003 Nissan Altima Sedan?

To repair the P0128 code on a 2003 Nissan Altima Sedan, you may need to replace the thermostat, top up the coolant level, replace the coolant temperature sensor, or address any issues identified during the diagnostic process.

7. Is it possible to reset the P0128 code on a 2003 Nissan Altima Sedan without repairing the issue?

While you can clear the P0128 code using an OBDII scanner, it is essential to address the underlying problem causing the code to prevent further issues with your vehicle.

8. How much does it typically cost to fix the P0128 code on a 2003 Nissan Altima Sedan?

The cost of fixing the P0128 code on a 2003 Nissan Altima Sedan can vary depending on the root cause of the issue, but it typically ranges from $100 to $300 for parts and labor.

9. Can a DIY enthusiast repair the P0128 code on a 2003 Nissan Altima Sedan?

If you have the necessary tools and knowledge, you may be able to repair the P0128 code on a 2003 Nissan Altima Sedan yourself by following detailed guides or consulting with automotive experts.

10. How often does the thermostat need to be replaced in a 2003 Nissan Altima Sedan to prevent the P0128 code?

The thermostat in a 2003 Nissan Altima Sedan typically needs to be replaced every 50,000 to 100,000 miles or if any issues related to the cooling system arise to prevent triggering the P0128 code.