AutoCodes – Honda – P0128 2010 Honda Accord

P0128 2010 Honda Accord Code - Coolant System Malfunction

Quick Answer

Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine. 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 2010 Honda Accord indicates Coolant System Malfunction.
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 9,724

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 Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0128 2010 Honda Accord Description

Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.

OBDII Code P0128 2010 Honda Accord - Coolant System Malfunction - AutoCodes.com — P0128 2010 Honda Accord Code - Coolant System Malfunction

What does this mean?

What are the Possible Causes of the DTC P0128 2010 Honda Accord?

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 2010 Honda Accord?

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 2010 Honda Accord 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 2010 Honda Accord code?

Need more information on how to fix the P0128 2010 Honda Accord code? Get Access to Factory Service Manuals

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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 2010 Honda Accord Code

1. What are the common symptoms of OBDII code P0128 in a 2010 Honda Accord?

The common symptoms include the engine temperature gauge reading lower than normal, decreased fuel efficiency, and the check engine light illuminating on the dashboard.

2. What does the OBDII code P0128 indicate in a 2010 Honda Accord?

The code P0128 indicates a Coolant System Malfunction, specifically pointing to a thermostat that is not operating as expected.

3. What are the possible causes of OBDII code P0128 in a 2010 Honda Accord?

Possible causes may include a faulty thermostat, low coolant level, a malfunctioning coolant temperature sensor, or issues with the cooling system.

4. How can I diagnose the cause of OBDII code P0128 in my 2010 Honda Accord?

You can start by checking the coolant level, inspecting the thermostat for proper operation, testing the coolant temperature sensor, and examining the overall condition of the cooling system.

5. Can a faulty thermostat cause OBDII code P0128 in a 2010 Honda Accord?

Yes, a faulty thermostat that is stuck open or opening too soon can trigger the code P0128 by preventing the engine from reaching its optimal operating temperature.

6. Is it safe to continue driving with OBDII code P0128 in a 2010 Honda Accord?

It is not recommended to continue driving with this code unresolved, as it can lead to decreased engine performance, reduced fuel efficiency, and potential damage to engine components.

7. How can I repair OBDII code P0128 in my 2010 Honda Accord?

Repair options may include replacing the thermostat, addressing any coolant leaks, testing and replacing the coolant temperature sensor, and ensuring proper functioning of the cooling system.

8. Can a DIY enthusiast fix OBDII code P0128 in a 2010 Honda Accord?

Yes, some repairs related to code P0128 can be done by DIY enthusiasts, such as replacing the thermostat or checking and topping up the coolant level. However, complex issues may require professional assistance.

9. Will resetting the check engine light resolve OBDII code P0128 in a 2010 Honda Accord?

Resetting the check engine light may temporarily turn it off, but it will not resolve the underlying issue causing the code. It is essential to diagnose and fix the root cause of the problem.

10. How can I prevent OBDII code P0128 from recurring in my 2010 Honda Accord?

Regular maintenance of the cooling system, timely replacement of the thermostat, monitoring coolant levels, and addressing any issues promptly can help prevent the recurrence of code P0128.