AutoCodes – Toyota – P0128 2009 Toyota Camry

P0128 2009 Toyota Camry Code - Coolant Thermostat

Quick Answer

Coolant temperature below thermostat regulating temperature. 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 2009 Toyota Camry 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 4,721

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 2009 Toyota Camry Description

Coolant temperature below thermostat regulating temperature. 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 2009 Toyota Camry - Coolant Thermostat - AutoCodes.com — P0128 2009 Toyota Camry Code - Coolant Thermostat

What does this mean?

What are the Possible Causes of the DTC P0128 2009 Toyota Camry?

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 2009 Toyota Camry?

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 2009 Toyota Camry 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 2009 Toyota Camry code?

Need more information on how to fix the P0128 2009 Toyota Camry 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 2009 Toyota Camry Code

1. What does OBDII code P0128 on a 2009 Toyota Camry indicate?

The code P0128 in a 2009 Toyota Camry typically indicates an issue with the coolant thermostat.

2. What are the common symptoms of a P0128 code in a 2009 Toyota Camry?

Common symptoms include the engine running cooler than normal, slow engine warm-up, poor fuel economy, and potential overheating.

3. What are the possible causes of a P0128 code in a 2009 Toyota Camry?

Possible causes include a faulty thermostat, low engine coolant level, a malfunctioning coolant temperature sensor, or a stuck-open thermostat.

4. How can I diagnose a P0128 code in a 2009 Toyota Camry?

Diagnosing the issue involves checking the coolant level, inspecting the thermostat for proper operation, testing the coolant temperature sensor, and ensuring the cooling system is functioning correctly.

5. Can I still drive my 2009 Toyota Camry with a P0128 code?

It is not recommended to drive the vehicle with a P0128 code as it can lead to engine damage due to improper temperature regulation.

6. How can I repair a P0128 code in a 2009 Toyota Camry?

Repairing the issue typically involves replacing the coolant thermostat, ensuring the cooling system is bled properly, and clearing the error code with an OBDII scanner.

7. Is it possible to reset the P0128 code in a 2009 Toyota Camry without fixing the issue?

Resetting the code without addressing the underlying problem may temporarily clear the warning light, but the issue will likely recur if not properly repaired.

8. How much does it cost to fix a P0128 code in a 2009 Toyota Camry?

The cost of fixing a P0128 code can vary depending on the root cause, but it typically ranges from $150 to $400, including parts and labor.

9. Can a DIY enthusiast replace the thermostat to fix a P0128 code in a 2009 Toyota Camry?

Replacing the thermostat can be a DIY project for those with mechanical skills and the necessary tools. However, if unsure, it's best to consult a professional mechanic.

10. How often should the coolant thermostat be replaced in a 2009 Toyota Camry?

The coolant thermostat is a wear item and should be inspected regularly. It is recommended to replace it every 50,000 to 100,000 miles or as per the manufacturer's maintenance schedule.