AutoCodes – Toyota – P1118 2006 Toyota Prius

P1118 2006 Toyota Prius Code - Coolant Temperature Sensor Circuit High for Coolant Heat Storage System

Quick Answer

This system uses an electric pump to supply hot coolant stored in the coolant heat storage tank into the cylinder head of the engine, in order to optimize engine starting combustion and reduce the amount of unburned gas that is discharged while the engine is started. Common causes include Coolant Heat Storage Tank, Faulty Engine Coolant Temperature (ECT) sensor for CHS (Coolant Heat Storage), Low engine coolant level. 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: P1118 2006 Toyota Prius indicates Coolant Temperature Sensor Circuit High for Coolant Heat Storage System.
Common causes: Common causes include Coolant Heat Storage Tank, Faulty Engine Coolant Temperature (ECT) sensor for CHS (Coolant Heat Storage), Low engine coolant level.
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 5,585

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 24, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1118 2006 Toyota Prius Description

This system uses an electric pump to supply hot coolant stored in the coolant heat storage tank into the cylinder head of the engine, in order to optimize engine starting combustion and reduce the amount of unburned gas that is discharged while the engine is started. Before the engine starts, the ECM operates the electric water pump to direct the hot coolant in the heat storage tank into the engine, in order to heat the cylinder head (this process is called "preheat mode"). The duration of the operation of the electric water pump is variable, depending on the temperature of the cylinder head. During the normal operation of the engine, the water valve opens the passage between the cylinder head and the heater and closes the passage between the cylinder head and the tank. During preheat mode in which the cylinder head is heated, the water valve opens the passage between the tank and the cylinder head, in order to allow the coolant to flow from the tank to the cylinder head. At this time, in order to warm up the intake port quickly before the engine is started, the coolant flows in the reverse direction

OBDII Code P1118 2006 Toyota Prius - Coolant Temperature Sensor Circuit High for Coolant Heat Storage System - AutoCodes.com — P1118 2006 Toyota Prius Code - Coolant Temperature Sensor Circuit High for Coolant Heat Storage System

What does this mean?

What are the Possible Causes of the DTC P1118 2006 Toyota Prius?

Coolant Heat Storage Tank
Faulty Engine Coolant Temperature (ECT) sensor for CHS (Coolant Heat Storage)
Low engine coolant level
Engine Coolant Temperature (ECT) sensor for HST harness is open or shorted
Engine Coolant Temperature (ECT) sensor for HST electrical circuit poor connection
Faulty engine coolant thermostat

How to Fix the DTC P1118 2006 Toyota Prius?

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 P1118 2006 Toyota Prius 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 P1118 2006 Toyota Prius code?

Need more information on how to fix the P1118 2006 Toyota Prius code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1118 2006 Toyota Prius 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 P1118 2006 Toyota Prius Code

1. What are common symptoms of OBDII code P1118 on a 2006 Toyota Prius?

- Common symptoms include the Check Engine light coming on, temperature gauge reading inaccurately, and potential issues with the hybrid system.

2. What does the OBDII code P1118 indicate in a 2006 Toyota Prius?

- OBDII code P1118 specifically refers to a Coolant Temperature Sensor Circuit High for the Coolant Heat Storage System in the Prius.

3. What are possible causes of the P1118 code in a 2006 Toyota Prius?

- Possible causes include a faulty coolant temperature sensor, issues with the coolant level or quality, wiring problems, or a malfunctioning hybrid system component.

4. How can I diagnose the P1118 code on my 2006 Toyota Prius?

- Diagnostic steps may involve checking the coolant level and quality, inspecting the coolant temperature sensor and its wiring, as well as scanning the hybrid system for any related issues.

5. Can I drive my 2006 Toyota Prius with the P1118 code?

- It is not recommended to drive with the P1118 code illuminated, as it can lead to further damage to the hybrid system and potentially affect the vehicle's performance.

6. How do I repair the Coolant Temperature Sensor Circuit High issue in my 2006 Toyota Prius?

- Repair typically involves replacing the faulty coolant temperature sensor, ensuring proper wiring connections, and addressing any underlying coolant system issues.

7. Is it possible to reset the P1118 code on a 2006 Toyota Prius?

- While clearing the code may temporarily turn off the Check Engine light, it is essential to address the root cause of the issue to prevent the code from reoccurring.

8. Can a DIY enthusiast fix the P1118 code on a 2006 Toyota Prius?

- Depending on your skill level and access to tools, some DIY enthusiasts may be able to diagnose and replace the coolant temperature sensor themselves. However, complex issues may require professional assistance.

9. How much does it cost to repair the P1118 code on a 2006 Toyota Prius?

- The cost of repairing the P1118 code can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

10. Are there any preventive measures to avoid the P1118 code in a 2006 Toyota Prius?

- Regular maintenance, such as checking coolant levels and quality, can help prevent issues with the coolant temperature sensor and reduce the likelihood of triggering the P1118 code.

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