AutoCodes – Honda – P0128 2019 Honda CR-V

P0128 2019 Honda CR-V Code - Cooling System Malfunction

Quick Answer

The thermostat is closed when the engine coolant temperature is low, and it stops the circulation of engine coolant to speed up engine warm-up. Common causes include Low engine coolant level, Leaking or stuck open thermostat, Faulty Engine Coolant Temperature (ECT) Sensor 1. 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 2019 Honda CR-V indicates Cooling System Malfunction.
Common causes: Common causes include Low engine coolant level, Leaking or stuck open thermostat, Faulty Engine Coolant Temperature (ECT) Sensor 1.
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 279

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 Aug 03, 2023

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0128 2019 Honda CR-V Description

The thermostat is closed when the engine coolant temperature is low, and it stops the circulation of engine coolant to speed up engine warm-up. When the engine coolant temperature increases, the thermostat opens and circulates the engine coolant to control its temperature. When the engine coolant temperature decreases, the opening area of the thermostat is reduced to regulate the engine coolant temperature. If the thermostat sticks open, engine warm-up is delayed, and exhaust emissions are adversely affected. The Powertrain Control Module (PCM) measures the rise in the coolant temperature after the engine starts at the engine block and at the radiator, and it estimates the characteristics of the engine coolant temperature by calculations based on those two temperatures and the driving conditions. When the Engine Coolant Temperature (ECT) Sensor 2 immediately increases from the starting value, it is defined as the thermostat stuck open. When ECT Sensor 1 does not reach a specified value at a certain condition, it is defined as a thermostat malfunction.

OBDII Code P0128 2019 Honda CR-V - Cooling System Malfunction - AutoCodes.com — P0128 2019 Honda CR-V Code - Cooling System Malfunction

What does this mean?

What are the Possible Causes of the DTC P0128 2019 Honda CR-V?

Low engine coolant level
Leaking or stuck open thermostat
Faulty Engine Coolant Temperature (ECT) Sensor 1
Faulty Engine Coolant Temperature Sensor 2
Faulty Intake Air Temperature (IAT) Sensor
Faulty Manifold Absolute Pressure (MAP) Sensor
Faulty Crankshaft Position (CKP) Sensor
Faulty Barometric Pressure (BARO) Sensor
Faulty Radiator Fan

How to Fix the DTC P0128 2019 Honda CR-V?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0128 2019 Honda CR-V 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 2019 Honda CR-V code?

Need more information on how to fix the P0128 2019 Honda CR-V code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0128 2019 Honda CR-V code diagnosed by a professional: Find a repair shop in your area

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 2019 Honda CR-V Code

1. What does OBDII code P0128 on a 2019 Honda CR-V indicate?

This code indicates a cooling system malfunction, specifically that the engine is not reaching its normal operating temperature within the expected time frame.

2. What are the common symptoms of OBDII code P0128 on a 2019 Honda CR-V?

Common symptoms include the engine running colder than normal, reduced fuel efficiency, and the check engine light illuminating on the dashboard.

3. What are the possible causes of OBDII code P0128 on a 2019 Honda CR-V?

Possible causes include a faulty thermostat, low coolant levels, a malfunctioning coolant temperature sensor, or issues with the engine's cooling system.

4. How can I diagnose the cause of OBDII code P0128 on my 2019 Honda CR-V?

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 2019 Honda CR-V with OBDII code P0128?

It is not recommended to drive your vehicle with this code active, as it can lead to poor engine performance, decreased fuel efficiency, and potential long-term damage to the engine.

6. How can I reset OBDII code P0128 on my 2019 Honda CR-V?

After resolving the underlying issue causing the code, you can reset it using an OBDII scanner or by disconnecting the car's battery for a few minutes.

7. Will OBDII code P0128 on my 2019 Honda CR-V cause any damage if left untreated?

Leaving this code untreated can potentially lead to overheating issues, engine damage, and increased emissions, so it's best to address it promptly.

8. Is it possible to prevent OBDII code P0128 from appearing on my 2019 Honda CR-V?

Regular maintenance, such as changing the coolant and thermostat at recommended intervals, can help prevent this code from appearing due to cooling system issues.

9. How much does it typically cost to repair OBDII code P0128 on a 2019 Honda CR-V?

The cost of repair can vary depending on the exact cause of the code, but it may involve replacing the thermostat, coolant temperature sensor, or addressing other cooling system issues.

10. Can a DIY enthusiast fix OBDII code P0128 on a 2019 Honda CR-V?

Some aspects of diagnosing and repairing this code can be tackled by DIY enthusiasts, such as checking coolant levels and replacing the thermostat, but more complex issues may require professional assistance.