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P0128 Acura Code - Cooling System Malfunction

Quick Answer

The P0128 diagnostic trouble code (DTC) for Acura vehicles indicates a cooling system malfunction. Common causes include Stuck thermostat, Faulty coolant temperature sensor, Low coolant level. 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 Acura indicates Cooling System Malfunction.
Common causes
Common causes include Stuck thermostat, Faulty coolant temperature sensor, Low coolant level.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0128 Acura Description

The P0128 diagnostic trouble code (DTC) for Acura vehicles indicates a cooling system malfunction. This code is typically triggered when the engine's coolant temperature does not reach the proper operating temperature within a specified time after starting the engine. The cooling system plays a crucial role in maintaining the engine's temperature within optimal levels to prevent overheating and ensure efficient operation. When the cooling system malfunctions, it can lead to various issues that affect the vehicle's performance and potentially cause long-term damage if not addressed promptly.

OBDII Code P0128 Acura - Cooling System Malfunction
P0128 Acura Code - Cooling System Malfunction

Common Causes of P0128 Acura

  1. Stuck thermostat
  2. Faulty coolant temperature sensor
  3. Low coolant level
  4. Air pockets in the cooling system
  5. Malfunctioning water pump

Symptoms of P0128 Acura

  1. Engine running colder than normal
  2. Poor fuel economy
  3. Check Engine Light illuminated
  4. Reduced heater performance
  5. Engine overheating in extreme cases

How to Fix P0128 Acura

  1. Begin by checking the coolant level and ensuring it is at the proper level.
  2. Test the thermostat to determine if it is functioning correctly. Replace if necessary.
  3. Inspect the coolant temperature sensor for any signs of damage or malfunction. Replace if needed.
  4. Bleed the cooling system to remove any air pockets that may be affecting its operation.
  5. Check the water pump for proper function and replace if it is not circulating coolant effectively.

Cost to Fix P0128 Acura

The cost of repairing a P0128 cooling system malfunction can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of parts for this repair can range from $50 to $200, with labor costs adding an additional $100 to $300. Keep in mind that diagnostic time and labor rates can vary, so it's recommended to obtain quotes from local auto repair shops for a more accurate estimate.

What does this mean?

Tech Notes for P0128 Acura

If the cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem.



When troubleshooting a 2000-2001 Accord or 2001-2002 Civic, if the PGM Tester tells you there is a DTC P0128 (Cooling System Malfunction) or P1486 (Cooling System Malfunction) set, it's really reporting the same thing. DTC P0128 is an SAE or generic Diagnostic Trouble Code (DTC) while P1486 is a manufacturer-specific DTC. Since these DTCs are similar, the PGM Tester sometimes reports a P0128 when it detects a P1486 or vice versa.











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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 Acura Code

1. What are the common symptoms of an OBDII code P0128 in an Acura?

The common symptoms include the engine running hotter or colder than normal, a decrease in fuel economy, and the temperature gauge showing unusual readings.

2. What are the possible causes of a P0128 code in an Acura?

Possible causes include a faulty thermostat, a malfunctioning coolant temperature sensor, low coolant levels, a leaking or stuck open thermostat, or issues with the cooling fan.

3. How can I diagnose a P0128 code in my Acura?

You can diagnose a P0128 code by checking the coolant level, inspecting the thermostat for proper operation, testing the coolant temperature sensor, and ensuring that the cooling fan is functioning correctly.

4. Can I still drive my Acura with a P0128 code?

It is not recommended to drive your Acura with a P0128 code, as it can lead to engine overheating and potential damage. It is best to address the issue promptly.

5. How do I repair a P0128 code in my Acura?

To repair a P0128 code, you may need to replace the thermostat, coolant temperature sensor, or address any cooling system issues. It is recommended to have a professional mechanic diagnose and repair the problem.

6. Will resetting the check engine light resolve a P0128 code in my Acura?

Resetting the check engine light may temporarily remove the warning, but if the underlying issue causing the P0128 code is not addressed, the light will likely come back on. It is essential to diagnose and repair the problem.

7. Can a P0128 code be triggered by a faulty coolant temperature sensor?

Yes, a faulty coolant temperature sensor is a common cause of a P0128 code. If the sensor is not reading the coolant temperature correctly, it can lead to improper engine cooling operation.

8. What are the potential risks of ignoring a P0128 code in my Acura?

Ignoring a P0128 code can lead to engine overheating, which can cause severe damage to the engine components and result in costly repairs. It is crucial to address cooling system issues promptly.

9. How long does it typically take to repair a P0128 code in an Acura?

The repair time for a P0128 code can vary depending on the exact cause of the issue. Simple fixes like replacing a thermostat may take a couple of hours, while more complex problems could take longer.

10. Is it possible to prevent a P0128 code from occurring in my Acura?

Regular maintenance of the cooling system, including checking coolant levels, inspecting the thermostat, and addressing any leaks promptly, can help prevent a P0128 code from occurring in your Acura.

Discuss the causes and fixes for P0128 Acura OBDII Code

Submit a New Comment

  • My 2002 acura tl s type almost redlines between switching gears and jerks the car hard i dont know what it is can someone help me.

    Reply to Comment

  • The symptoms you have described sounds like you may have a problem with the transmission and it's not related to the P0128 code. You should start by checking the transmission fluid level and condition. Do you have any more codes besides the P0128 code?

    Reply to Comment