AutoCodes – Toyota – P1150 2009 Toyota Prius

P1150 2009 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 2009 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 7,192

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 2009 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 2009 Toyota Prius - Coolant Path Clog of Coolant Heat Storage System - AutoCodes.com — P1150 2009 Toyota Prius Code - Coolant Path Clog of Coolant Heat Storage System

What does this mean?

What are the Possible Causes of the DTC P1150 2009 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 2009 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 2009 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 2009 Toyota Prius code?

Need more information on how to fix the P1150 2009 Toyota Prius code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1150 2009 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 2009 Toyota Prius Code

1. What does OBDII code P1150 mean for a 2009 Toyota Prius?

The P1150 code indicates a coolant path clog in the coolant heat storage system of the vehicle.

2. What are the common symptoms of a coolant path clog in a 2009 Toyota Prius?

Common symptoms include reduced engine performance, overheating, erratic temperature gauge readings, and potential coolant leaks.

3. What are the possible causes of OBDII code P1150 on a 2009 Toyota Prius?

The code can be triggered by a blockage in the coolant path, a malfunctioning water pump, a faulty thermostat, or issues with the coolant flow control valve.

4. How can I diagnose a coolant path clog in my 2009 Toyota Prius?

Diagnosing the issue typically involves checking the coolant level, inspecting for leaks, testing the thermostat, and ensuring proper flow through the coolant system.

5. Can I continue driving my 2009 Toyota Prius with OBDII code P1150?

It is not recommended to drive the vehicle with a coolant path clog, as it can lead to serious engine damage due to overheating.

6. How can I repair a coolant path clog in my 2009 Toyota Prius?

Repairing the issue may involve flushing the coolant system, replacing the water pump, thermostat, or coolant flow control valve, and ensuring proper coolant flow.

7. Are there any preventive maintenance tips to avoid OBDII code P1150 in a 2009 Toyota Prius?

Regularly flushing and replacing the coolant, checking for leaks, and ensuring the proper functioning of cooling system components can help prevent coolant path clogs.

8. Can a DIY enthusiast fix OBDII code P1150 on a 2009 Toyota Prius?

While some basic diagnostics can be done at home, fixing a coolant path clog may require specialized tools and expertise, so it is advisable to consult a professional mechanic.

9. How much does it cost to repair OBDII code P1150 on a 2009 Toyota Prius?

The cost of repair can vary depending on the exact cause of the coolant path clog and the parts and labor involved. It is recommended to get a diagnostic and estimate from a qualified mechanic.

10. Is OBDII code P1150 a common issue in 2009 Toyota Prius vehicles?

Coolant path clogs leading to the P1150 code can occur in older Prius models due to wear and tear on cooling system components, but it is not considered a widespread issue.

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