AutoCodes – Toyota – P1150 2005 Toyota Prius

P1150 2005 Toyota Prius Code - Coolant Path Clog of Coolant Heat Storage System

Quick Answer

This system uses an electric pump to supply hot coolant stored in the coolant heat storage (CHS) 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 outlet temperature sensor, Water valve (coolant flow control valve), Cooling system (clogging). 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: P1150 2005 Toyota Prius indicates Coolant Path Clog of Coolant Heat Storage System.
Common causes: Common causes include Coolant heat storage tank outlet temperature sensor, Water valve (coolant flow control valve), Cooling system (clogging).
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 10,232

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 May 02, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1150 2005 Toyota Prius Description

This system uses an electric pump to supply hot coolant stored in the coolant heat storage (CHS) 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 Engine Control Module (ECM) operates the electric water pump to direct the hot coolant in the CHS 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 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 the 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 P1150 2005 Toyota Prius - Coolant Path Clog of Coolant Heat Storage System - AutoCodes.com — P1150 2005 Toyota Prius Code - Coolant Path Clog of Coolant Heat Storage System

What does this mean?

What are the Possible Causes of the DTC P1150 2005 Toyota Prius?

Coolant heat storage tank outlet temperature sensor
Water valve (coolant flow control valve)
Cooling system (clogging)
Engine Control Module (ECM)

How to Fix the DTC P1150 2005 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 P1150 2005 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 P1150 2005 Toyota Prius code?

Need more information on how to fix the P1150 2005 Toyota Prius code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1150 2005 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 P1150 2005 Toyota Prius Code

1. What does the P1150 OBDII code mean on a 2005 Toyota Prius?

The P1150 code on a 2005 Toyota Prius indicates a coolant path clog in the coolant heat storage system.

2. What are the common symptoms of a coolant path clog in the coolant heat storage system?

Common symptoms include engine overheating, poor heater performance, and potential coolant leaks.

3. What are the possible causes of the P1150 code in a 2005 Toyota Prius?

The P1150 code is typically caused by a blockage in the coolant path within the coolant heat storage system, often due to debris or scale buildup.

4. How can I diagnose a coolant path clog in the coolant heat storage system on a 2005 Toyota Prius?

Diagnosing a coolant path clog may involve inspecting the coolant system for blockages, checking coolant levels and condition, and performing a flow test to identify restrictions.

5. What are the repair options for addressing a coolant path clog in the coolant heat storage system?

Repair options may include flushing the coolant system, replacing the coolant heat storage tank, cleaning or replacing the coolant control valve, and addressing any underlying issues causing the blockage.

6. Can I drive my 2005 Toyota Prius with the P1150 code?

It is not recommended to drive your Prius with the P1150 code, as a coolant path clog can lead to engine overheating and potential damage if left unaddressed.

7. How much does it cost to repair a coolant path clog in the coolant heat storage system of a 2005 Toyota Prius?

The cost of repair can vary depending on the extent of the blockage and the necessary repairs, but it may range from a few hundred to over a thousand dollars.

8. How can I prevent a coolant path clog in the coolant heat storage system of my 2005 Toyota Prius?

Regular maintenance, such as flushing the coolant system at recommended intervals and using high-quality coolant, can help prevent blockages in the coolant path.

9. Is the P1150 code a common issue in 2005 Toyota Prius vehicles?

The P1150 code related to a coolant path clog in the coolant heat storage system is not uncommon in 2005 Toyota Prius models, especially as the vehicle ages.

10. Can a DIY enthusiast repair a coolant path clog in the coolant heat storage system of a 2005 Toyota Prius?

While some DIY enthusiasts may be able to address simpler blockages, diagnosing and repairing a coolant path clog in the coolant heat storage system often requires professional expertise and specialized tools.

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