AutoCodes – Toyota – P1115 2007 Toyota Prius

P1115 2007 Toyota Prius Code - Coolant Temperature Sensor Circuit For 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: P1115 2007 Toyota Prius indicates Coolant Temperature Sensor Circuit For 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 4,549

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 21, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1115 2007 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 P1115 2007 Toyota Prius - Coolant Temperature Sensor Circuit For Heat Storage System - AutoCodes.com — P1115 2007 Toyota Prius Code - Coolant Temperature Sensor Circuit For Heat Storage System

What does this mean?

What are the Possible Causes of the DTC P1115 2007 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 P1115 2007 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 P1115 2007 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 P1115 2007 Toyota Prius code?

Need more information on how to fix the P1115 2007 Toyota Prius code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1115 2007 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 P1115 2007 Toyota Prius Code

1. What are the common symptoms of OBDII code P1115 in a 2007 Toyota Prius?

The common symptoms of code P1115 in a 2007 Toyota Prius include engine overheating, poor fuel economy, and potential issues with the vehicle's hybrid system.

2. What does the OBDII code P1115 indicate in a 2007 Toyota Prius?

Code P1115 in a 2007 Toyota Prius specifically refers to a fault in the Coolant Temperature Sensor Circuit for the Heat Storage System.

3. What are the possible causes of OBDII code P1115 in a 2007 Toyota Prius?

The possible causes of code P1115 in a 2007 Toyota Prius can include a faulty coolant temperature sensor, wiring or connection issues, or a malfunction in the heat storage system.

4. How can I diagnose the OBDII code P1115 in my 2007 Toyota Prius?

Diagnosing code P1115 involves checking the coolant temperature sensor, inspecting related wiring and connections, and using a scan tool to monitor temperature sensor readings.

5. Can I continue driving my 2007 Toyota Prius with OBDII code P1115?

It is not recommended to continue driving your 2007 Toyota Prius with code P1115 as it can lead to engine overheating and potentially cause more severe damage.

6. How can I repair OBDII code P1115 in my 2007 Toyota Prius?

Repairing code P1115 in a 2007 Toyota Prius may involve replacing the faulty coolant temperature sensor, repairing any damaged wiring, or addressing issues with the heat storage system.

7. Will resetting the OBDII code P1115 in my 2007 Toyota Prius make it go away permanently?

Resetting the code may temporarily clear the error, but if the underlying issue causing code P1115 is not fixed, the code is likely to reappear.

8. Can a DIY enthusiast fix OBDII code P1115 in a 2007 Toyota Prius?

Depending on your experience and tools available, you may be able to address code P1115 yourself by replacing the coolant temperature sensor or fixing wiring issues. However, professional help is recommended for accurate diagnosis and repair.

9. How much does it typically cost to repair OBDII code P1115 in a 2007 Toyota Prius?

The cost of repairing code P1115 in a 2007 Toyota Prius can vary based on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.

10. Is it important to address OBDII code P1115 promptly in a 2007 Toyota Prius?

Yes, it is crucial to address code P1115 promptly in a 2007 Toyota Prius to prevent potential engine damage, ensure optimal vehicle performance, and maintain fuel efficiency.

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