AutoCodes – Toyota – P0128 2013 Toyota RAV4

P0128 2013 Toyota RAV4 Code - Coolant Thermostat

Quick Answer

The ECM estimates the engine coolant temperature based on the starting temperature, engine loads, and engine speeds. 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 2013 Toyota RAV4 indicates Coolant Thermostat.
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 1,028

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 23, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0128 2013 Toyota RAV4 Description

The ECM estimates the engine coolant temperature based on the starting temperature, engine loads, and engine speeds. The Engine Control Module (ECM) then compares the estimated temperature with the actual engine coolant temperature. When the estimated engine coolant temperature reaches 75°C (167°F), the ECM checks the actual engine coolant temperature. If the actual engine coolant temperature is less than 75°C (167°F), the ECM interprets this as a malfunction in the thermostat or the engine cooling system and stores the Diagnostic Trouble Code (DTC).

OBDII Code P0128 2013 Toyota RAV4 - Coolant Thermostat - AutoCodes.com — P0128 2013 Toyota RAV4 Code - Coolant Thermostat

What does this mean?

What are the Possible Causes of the DTC P0128 2013 Toyota RAV4?

Leaking or stuck open thermostat
Low engine coolant level
Insufficient warm up time
Faulty Engine Coolant Temperature (ECT) sensor
Engine Coolant Temperature sensor harness is open or shorted
Engine Coolant Temperature sensor electrical circuit poor connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0128 2013 Toyota RAV4?

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

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0128 2013 Toyota RAV4 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 2013 Toyota RAV4 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 2013 Toyota RAV4 Code

1. What does OBDII code P0128 on a 2013 Toyota RAV4 indicate?

The OBDII code P0128 in a 2013 Toyota RAV4 typically indicates an issue with the coolant thermostat operating below the regulated temperature.

2. What are common symptoms of a P0128 code in a 2013 Toyota RAV4?

Common symptoms of a P0128 code in a 2013 Toyota RAV4 may include the engine running colder than normal, a decrease in fuel efficiency, and the check engine light being illuminated.

3. What are the possible causes of a P0128 code in a 2013 Toyota RAV4?

Possible causes of a P0128 code in a 2013 Toyota RAV4 include a malfunctioning thermostat, low coolant levels, a faulty coolant temperature sensor, or issues with the cooling system.

4. How serious is a P0128 code on a 2013 Toyota RAV4?

While a P0128 code may not cause immediate harm to your vehicle, it can lead to reduced fuel efficiency and potential engine damage if left unresolved for an extended period.

5. How can I diagnose a P0128 code on my 2013 Toyota RAV4?

Diagnosing a P0128 code on a 2013 Toyota RAV4 typically involves checking the coolant level, inspecting the thermostat for proper operation, testing the coolant temperature sensor, and examining the overall condition of the cooling system.

6. Can I continue driving my 2013 Toyota RAV4 with a P0128 code?

It's generally not recommended to drive your 2013 Toyota RAV4 with a P0128 code for an extended period as it can lead to decreased engine performance and potential long-term damage. It's best to address the issue promptly.

7. How do I repair a P0128 code on my 2013 Toyota RAV4?

Repairing a P0128 code on a 2013 Toyota RAV4 typically involves replacing the thermostat, ensuring proper coolant levels, checking and replacing the coolant temperature sensor if necessary, and flushing the cooling system if needed.

8. Is it possible to reset a P0128 code on a 2013 Toyota RAV4 without fixing the issue?

Resetting a P0128 code without addressing the underlying problem will only temporarily turn off the check engine light. It's crucial to diagnose and repair the issue to prevent further complications.

9. How much does it cost to fix a P0128 code on a 2013 Toyota RAV4?

The cost to fix a P0128 code on a 2013 Toyota RAV4 can vary depending on the specific cause of the issue, but it may involve expenses for parts and labor ranging from $100 to $300 or more.

10. Can a DIY enthusiast repair a P0128 code on a 2013 Toyota RAV4?

While some experienced DIY enthusiasts may be able to address a P0128 code on a 2013 Toyota RAV4, it's recommended to consult a professional mechanic for accurate diagnosis and proper repair to ensure the issue is resolved correctly.