AutoCodes – Lexus – C1391 Lexus

C1391 Lexus Code - Abnormal Leak Of Accumulator Pressure

Quick Answer

The Diagnostic Trouble Code (DTC) is stored if a brake fluid, internal or other leak is detected due to improper sealing in the actuator. Common causes include Fluid Leakage, Faulty Brake Actuator Assembly, Brake Actuator Assembly harness is open or shorted. 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: C1391 Lexus indicates Abnormal Leak Of Accumulator Pressure.
Common causes: Common causes include Fluid Leakage, Faulty Brake Actuator Assembly, Brake Actuator Assembly harness is open or shorted.
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 25,879

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 Sep 27, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1391 Lexus Description

The Diagnostic Trouble Code (DTC) is stored if a brake fluid, internal or other leak is detected due to improper sealing in the actuator. Internal leakage is suspected if the pump motor operates frequently without breaking.

OBDII Code C1391 Lexus - Abnormal Leak Of Accumulator Pressure - AutoCodes.com — C1391 Lexus Code - Abnormal Leak Of Accumulator Pressure

What does this mean?

What are the Possible Causes of the DTC C1391 Lexus?

Fluid Leakage
Faulty Brake Actuator Assembly
Brake Actuator Assembly harness is open or shorted
Brake Actuator Assembly circuit poor electrical connection

How to Fix the DTC C1391 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 C1391 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 C1391 Lexus code?

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Get the C1391 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 C1391 Lexus Code

1. What are the common symptoms of OBDII code C1391 in a Lexus related to abnormal leak of accumulator pressure?

- Common symptoms include issues with the vehicle's braking system, such as a spongy brake pedal or reduced brake performance.

2. What are the possible causes of OBDII code C1391 in a Lexus indicating abnormal leak of accumulator pressure?

- Possible causes may include a faulty accumulator, leaking hydraulic components, or issues with the brake actuator assembly.

3. How can I diagnose the OBDII code C1391 in my Lexus for abnormal leak of accumulator pressure?

- Diagnosing this code typically involves using a scan tool to read the codes, inspecting the brake system components, and performing a pressure test on the accumulator.

4. What are some repair tips for addressing OBDII code C1391 in a Lexus related to abnormal leak of accumulator pressure?

- Repair tips may include replacing the faulty accumulator, repairing any leaking hydraulic components, or cleaning and inspecting the brake actuator assembly.

5. Is it safe to continue driving my Lexus with OBDII code C1391 indicating abnormal leak of accumulator pressure?

- It is not recommended to drive the vehicle with this code present, as it can affect the proper functioning of the braking system and compromise driving safety.

6. Can OBDII code C1391 in a Lexus be reset without fixing the underlying issue of abnormal leak of accumulator pressure?

- While you can clear the code temporarily, it is important to address the root cause of the issue to prevent further safety risks and potential damage to the vehicle.

7. How much does it typically cost to repair OBDII code C1391 in a Lexus due to abnormal leak of accumulator pressure?

- The cost of repairs can vary depending on the specific issue causing the code, but it may involve parts replacement, labor costs, and diagnostic fees.

8. Are there any preventive maintenance measures I can take to avoid OBDII code C1391 in my Lexus related to abnormal leak of accumulator pressure?

- Regularly inspecting and maintaining the brake system components, including the accumulator, can help prevent issues that may trigger this OBDII code.

9. Can a DIY enthusiast address OBDII code C1391 in a Lexus on their own, or is professional assistance necessary?

- While some simple inspections and maintenance tasks can be done by DIY enthusiasts, diagnosing and repairing complex issues related to this code may require professional expertise.

10. How long does it typically take to repair OBDII code C1391 in a Lexus caused by abnormal leak of accumulator pressure?

- The repair time can vary depending on the extent of the issue and the availability of parts, but it may take a few hours to a full day for a professional mechanic to address the problem thoroughly.