AutoCodes – Lexus – P1151 Lexus

P1151 Lexus Code - Coolant Heat Storage Tank

Quick Answer

What it means: P1151 Lexus 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 613

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 Lexus 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 Lexus - Coolant Heat Storage Tank - AutoCodes.com — P1151 Lexus Code - Coolant Heat Storage Tank

What does this mean?

What are the Possible Causes of the DTC P1151 Lexus?

Coolant heat storage tank

How to Fix the DTC P1151 Lexus?

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 Lexus 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 Lexus code?

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

Need Help with the Code?

Get the P1151 Lexus 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 Lexus Code

1. What are the common symptoms of OBDII code P1151 in a Lexus related to the Coolant Heat Storage Tank?

- Common symptoms include poor fuel economy, rough idling, and potential overheating issues.

2. What are some possible causes of the P1151 code in a Lexus, specifically related to the Coolant Heat Storage Tank?

- Causes can include a faulty thermostat, a malfunctioning coolant control valve, or a problem with the heat storage tank itself.

3. How can I diagnose the P1151 code in a Lexus Coolant Heat Storage Tank system?

- Diagnosis involves using an OBDII scanner to retrieve the specific code, checking coolant levels, inspecting the thermostat and control valve, and testing the heat storage tank.

4. Can a DIY enthusiast repair the P1151 code related to the Coolant Heat Storage Tank in a Lexus?

- While some basic checks can be done at home, diagnosing and repairing the exact cause of the code may require professional help due to the complexity of the system.

5. Is it safe to continue driving my Lexus with the P1151 code related to the Coolant Heat Storage Tank?

- It is not recommended to drive the vehicle for an extended period with this code as it can lead to further damage and potential engine overheating.

6. How much does it typically cost to repair the P1151 code in a Lexus Coolant Heat Storage Tank system?

- Costs can vary depending on the exact issue, but repairs related to this code can range from $200 to $600 or more, including parts and labor.

7. Can a problem with the Coolant Heat Storage Tank cause other OBDII codes to trigger in a Lexus?

- Yes, issues with the heat storage tank can sometimes cause related codes to trigger, such as P0128 (Coolant Thermostat Malfunction) or P0125 (Insufficient Coolant Temperature for Closed Loop Fuel Control).

8. Are there any preventative maintenance tips to avoid the P1151 code in a Lexus related to the Coolant Heat Storage Tank?

- Regularly checking and maintaining the cooling system, including coolant levels and the functionality of components like the thermostat and control valve, can help prevent issues that lead to this code.

9. How long does it typically take to repair the P1151 code related to the Coolant Heat Storage Tank in a Lexus?

- Repair times can vary based on the exact cause of the code, but most repairs related to this issue can be completed within a few hours to a day at a reputable auto repair shop.

10. Can resetting the OBDII system clear the P1151 code in a Lexus Coolant Heat Storage Tank system?

- Resetting the system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It is best to diagnose and repair the root cause of the problem.