AutoCodes – Honda – P0128 2018 Honda CR-V

P0128 2018 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 2018 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 336

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 2018 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 2018 Honda CR-V - Cooling System Malfunction - AutoCodes.com — P0128 2018 Honda CR-V Code - Cooling System Malfunction

What does this mean?

What are the Possible Causes of the DTC P0128 2018 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 2018 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 2018 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 2018 Honda CR-V code?

Need more information on how to fix the P0128 2018 Honda CR-V code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0128 2018 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 2018 Honda CR-V Code

1. What are the common symptoms of OBDII code P0128 in a 2018 Honda CR-V?

The common symptoms of code P0128 in a 2018 Honda CR-V include the engine running hotter than normal, the temperature gauge reading lower than usual, and a decrease in fuel efficiency.

2. What are the possible causes of OBDII code P0128 in a 2018 Honda CR-V?

Possible causes of code P0128 in a 2018 Honda CR-V include a faulty thermostat, a malfunctioning coolant temperature sensor, low coolant levels, or a problem with the cooling system.

3. How serious is OBDII code P0128 in a 2018 Honda CR-V?

Code P0128 indicates a potential issue with the cooling system, which can lead to engine overheating and damage if not addressed promptly. It is important to diagnose and repair this code to prevent further issues.

4. Can I continue to drive my 2018 Honda CR-V with OBDII code P0128?

It is not recommended to drive your Honda CR-V with code P0128, as it can lead to engine overheating and potential damage. It is best to address the issue as soon as possible.

5. How can I diagnose OBDII code P0128 in my 2018 Honda CR-V?

Diagnosing code P0128 involves checking the coolant level, testing the thermostat, inspecting the coolant temperature sensor, and ensuring proper operation of the cooling system components.

6. What are some repair tips for fixing OBDII code P0128 in a 2018 Honda CR-V?

Repair tips for code P0128 may include replacing the thermostat, coolant temperature sensor, or performing a coolant flush to address any issues with the cooling system.

7. How much does it cost to fix OBDII code P0128 in a 2018 Honda CR-V?

The cost of fixing code P0128 in a 2018 Honda CR-V can vary depending on the underlying cause of the issue, parts needed for repair, and labor costs. It is recommended to consult with a mechanic for an accurate estimate.

8. Can a DIY enthusiast fix OBDII code P0128 in a 2018 Honda CR-V?

While some aspects of diagnosing and repairing code P0128 may be tackled by a DIY enthusiast, it is recommended to have a professional mechanic address this issue, especially if it involves complex components of the cooling system.

9. How long does it take to repair OBDII code P0128 in a 2018 Honda CR-V?

The time required to repair code P0128 in a 2018 Honda CR-V can vary depending on the specific cause of the issue and the extent of the repair needed. A mechanic can provide a more accurate timeframe based on the diagnosis.

10. Will resetting the OBDII code P0128 in my 2018 Honda CR-V make the issue go away?

Resetting the OBDII code P0128 in your 2018 Honda CR-V may temporarily clear the warning light, but it will not fix the underlying issue causing the code. It is important to diagnose and address the root cause to prevent further problems.