AutoCodes – Toyota – P1151 2007 Toyota Prius

P1151 2007 Toyota Prius Code - Coolant Heat Storage Tank

Quick Answer

What it means: P1151 2007 Toyota Prius indicates Coolant Heat Storage Tank.
Common causes: Common causes include Coolant heat storage tank.
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 8,742

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 Dec 10, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1151 2007 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 P1151 2007 Toyota Prius - Coolant Heat Storage Tank - AutoCodes.com — P1151 2007 Toyota Prius Code - Coolant Heat Storage Tank

What does this mean?

What are the Possible Causes of the DTC P1151 2007 Toyota Prius?

Coolant heat storage tank

How to Fix the DTC P1151 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 P1151 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 P1151 2007 Toyota Prius code?

Need more information on how to fix the P1151 2007 Toyota Prius code? Get Access to Factory Service Manuals

Need Help with the 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 P1151 2007 Toyota Prius Code

What does the OBDII code P1151 mean for a 2007 Toyota Prius?

P1151 indicates a malfunction related to the Coolant Heat Storage Tank system, specifically indicating that the engine control module has detected a problem with the temperature or flow of coolant.

What are common symptoms of the P1151 code in a 2007 Toyota Prius?

Symptoms may include illuminated check engine light, reduced engine performance, poor fuel economy, or issues with the vehicle's heating system.

What could cause the P1151 code to trigger in a 2007 Toyota Prius?

Potential causes include a faulty coolant temperature sensor, issues with the coolant heat storage tank itself, low coolant levels, or wiring/connectivity issues in the system.

How can I diagnose the P1151 code?

Start by checking the vehicleâ€™s coolant level and inspecting for leaks. Then, use a diagnostic scanner to read live data from the coolant temperature sensor and check for any wiring or connector issues.

What repairs might be necessary to fix the P1151 code?

Repairs may involve replacing a faulty coolant temperature sensor, fixing or replacing the coolant heat storage tank, or addressing any wiring or connector issues found during diagnosis.

Can I drive my 2007 Toyota Prius with the P1151 code?

While you can drive the vehicle, it is not recommended as it may lead to overheating or other engine performance issues if the problem is not addressed promptly.

Is it safe to reset the check engine light when P1151 is present?

Resetting the check engine light may temporarily turn it off, but it is important to diagnose and repair the underlying issue to prevent further damage to the vehicle.

How can I prevent the P1151 code from recurring?

Regular maintenance, including checking coolant levels, inspecting the cooling system for leaks, and replacing worn components, can help prevent the recurrence of the P1151 code.

What is the average cost to repair the issues associated with the P1151 code?

Repair costs can vary widely, but you can expect to pay anywhere from $100 to $500 depending on the specific repairs needed, such as sensor replacement or coolant system repairs.