AutoCodes – Scion – P0128 2006 Scion xB

P0128 2006 Scion xB Code - Coolant Thermostat

Quick Answer

The thermostat is a component that blocks the flow of coolant to the radiator until the engine has warmed up. 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 2006 Scion xB 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 6,747

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 Apr 21, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0128 2006 Scion xB Description

The thermostat is a component that blocks the flow of coolant to the radiator until the engine has warmed up. When the engine is cold, no coolant flows through the engine. Once the engine reaches its operating temperature, the thermostat opens. The OBDII sets when the engine coolant temperature has not risen enough to open the thermostat even though the engine has run long enough. This is due to a leak in the seal or the thermostat open stuck.

OBDII Code P0128 2006 Scion xB - Coolant Thermostat - AutoCodes.com — P0128 2006 Scion xB Code - Coolant Thermostat

What does this mean?

What are the Possible Causes of the DTC P0128 2006 Scion xB?

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 2006 Scion xB?

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 2006 Scion xB 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 2006 Scion xB 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 2006 Scion xB Code

1. What does OBDII code P0128 on a 2006 Scion xB indicate?

- This code refers to an issue with the Coolant Thermostat, specifically indicating that the engine is not reaching operating temperature within the expected time frame.

2. What are the common symptoms of a P0128 code in a 2006 Scion xB?

- Symptoms may include the engine running cooler than normal, poor fuel economy, a noticeable decrease in heater output, and the Check Engine light being illuminated.

3. What are the possible causes of a P0128 code in a 2006 Scion xB?

- The most common causes include a faulty thermostat, a malfunctioning coolant temperature sensor, low coolant levels, a stuck open thermostat, or a problem with the cooling system.

4. How serious is a P0128 code on a 2006 Scion xB?

- While the issue may not cause immediate harm to the vehicle, it can lead to decreased fuel efficiency, increased emissions, and potential long-term damage if left unresolved.

5. What is the typical repair for a P0128 code in a 2006 Scion xB?

- The usual repair involves replacing the thermostat, ensuring proper coolant levels, and checking for any other underlying issues in the cooling system.

6. Can I continue driving my 2006 Scion xB with a P0128 code?

- It is not recommended to continue driving the vehicle with a P0128 code, as it can lead to reduced engine performance and potential overheating issues.

7. How much does it cost to fix a P0128 code in a 2006 Scion xB?

- The cost of repair can vary depending on the underlying issue, but it typically ranges from $150 to $300 for parts and labor.

8. How can I prevent a P0128 code from appearing in my 2006 Scion xB?

- To prevent this code, it's important to maintain regular coolant system maintenance, replace the thermostat as recommended by the manufacturer, and address any cooling system issues promptly.

9. Will resetting the Check Engine light make the P0128 code disappear in a 2006 Scion xB?

- Resetting the Check Engine light may temporarily turn it off, but if the underlying issue causing the P0128 code is not addressed, the light is likely to come back on.

10. Can a DIY enthusiast fix a P0128 code in a 2006 Scion xB?

- Depending on your skill level, replacing the thermostat on a 2006 Scion xB may be doable for a DIY enthusiast, but it's recommended to have the proper tools and knowledge to avoid causing further damage.