AutoCodes – Toyota – P1151 2005 Toyota Prius

P1151 2005 Toyota Prius Code - Coolant Heat Storage Tank

Quick Answer

What it means: P1151 2005 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 7,714

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 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 P1151 2005 Toyota Prius - Coolant Heat Storage Tank - AutoCodes.com — P1151 2005 Toyota Prius Code - Coolant Heat Storage Tank

What does this mean?

What are the Possible Causes of the DTC P1151 2005 Toyota Prius?

Coolant heat storage tank

How to Fix the DTC P1151 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 P1151 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 P1151 2005 Toyota Prius code?

Need more information on how to fix the P1151 2005 Toyota Prius code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1151 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 P1151 2005 Toyota Prius Code

1. What does OBDII code P1151 mean on a 2005 Toyota Prius?

- The code P1151 in a 2005 Toyota Prius typically indicates a problem with the Coolant Heat Storage Tank (CHST).

2. What are common symptoms of OBDII code P1151 on a 2005 Toyota Prius?

- Common symptoms of P1151 in a 2005 Prius may include reduced fuel efficiency, rough idling, and potential overheating issues.

3. What could cause OBDII code P1151 to appear on a 2005 Toyota Prius?

- The most common cause of P1151 in a 2005 Prius is a malfunction or failure of the Coolant Heat Storage Tank, which stores hot coolant for use during engine warm-up.

4. How can I diagnose the issue related to OBDII code P1151 on a 2005 Toyota Prius?

- To diagnose the problem, it is recommended to perform a visual inspection of the Coolant Heat Storage Tank for leaks, check coolant levels, and use an OBDII scanner to retrieve specific error codes.

5. Can I drive my 2005 Toyota Prius with OBDII code P1151?

- It is not recommended to drive your Prius with code P1151 as it could lead to potential engine overheating and further damage. It's best to address the issue promptly.

6. What are some repair tips for fixing OBDII code P1151 on a 2005 Toyota Prius?

- Repair tips may include checking and repairing any coolant leaks, replacing the Coolant Heat Storage Tank if necessary, and ensuring proper coolant levels and circulation.

7. Does fixing OBDII code P1151 on a 2005 Toyota Prius require professional assistance?

- While some DIY enthusiasts may be able to address the issue, it is advisable to seek professional help, especially if you are not experienced with automotive repairs.

8. How much does it typically cost to repair OBDII code P1151 on a 2005 Toyota Prius?

- The cost of repairing P1151 can vary depending on the extent of the issue, parts needed, and labor costs. It's recommended to get a few quotes from different mechanics.

9. Can ignoring OBDII code P1151 on a 2005 Toyota Prius lead to further problems?

- Ignoring code P1151 can potentially lead to more severe engine issues, decreased fuel efficiency, and even engine overheating, which may result in costly repairs.

10. Is OBDII code P1151 a common problem in 2005 Toyota Prius vehicles?

- While not extremely common, P1151 related to the Coolant Heat Storage Tank can occur in 2005 Prius models, especially as the vehicle ages. Regular maintenance can help prevent such issues.