AutoCodes – Lexus – C1256 Lexus

C1256 Lexus Code - Accumulator Low Pressure

Quick Answer

The Accumulator Pressure Sensor is built into the actuator and detects the accumulator pressure. Common causes include Faulty Accumulator Pressure Sensor, Accumulator Pressure Sensor harness is open or shorted, Accumulator Pressure Sensor circuit poor electrical connection. 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: C1256 Lexus indicates Accumulator Low Pressure.
Common causes: Common causes include Faulty Accumulator Pressure Sensor, Accumulator Pressure Sensor harness is open or shorted, Accumulator Pressure Sensor circuit poor electrical connection.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 20,458

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 Aug 31, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code C1256 Lexus Description

The Accumulator Pressure Sensor is built into the actuator and detects the accumulator pressure. The Accumulator Pressure Sensor is connected to the Skid Control ECU in the master cylinder solenoid. The Skid Control ECU Module monitors the Accumulator Pressure Sensor. The Skid Control ECU sets the OBDII code if it senses a decrease in the accumulator pressure.

OBDII Code C1256 Lexus - Accumulator Low Pressure - AutoCodes.com — C1256 Lexus Code - Accumulator Low Pressure

What does this mean?

What are the Possible Causes of the DTC C1256 Lexus?

Faulty Accumulator Pressure Sensor
Accumulator Pressure Sensor harness is open or shorted
Accumulator Pressure Sensor circuit poor electrical connection
Faulty Skid Control ECU

How to Fix the DTC C1256 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 C1256 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 C1256 Lexus code?

Need more information on how to fix the C1256 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1256 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 C1256 Lexus Code

1. What does the OBDII code C1256 mean on a Lexus?

C1256 indicates "Accumulator Low Pressure," meaning the brake system's hydraulic pressure is insufficient, often due to an issue with the brake actuator or accumulator.

2. What are the common symptoms of the C1256 code in a Lexus?

Symptoms include an illuminated ABS or brake warning light, reduced braking performance, unusual noises from the brake actuator, and a firm or spongy brake pedal.

3. What causes the C1256 code to appear on a Lexus?

Common causes include a failing brake accumulator, a malfunctioning brake actuator, low brake fluid levels, or internal leaks in the hydraulic system.

4. Can I drive my Lexus with the C1256 code?

Driving with this code is not recommended, as it can compromise braking performance and increase the risk of an accident.

5. How do I diagnose the C1256 code on a Lexus?

Diagnosis involves checking the brake fluid level, inspecting for leaks, testing the brake actuator and accumulator, and using a scan tool to monitor ABS sensor data.

6. What repairs are needed to fix the C1256 code?

Repairs may include replacing the brake actuator, repairing or replacing the accumulator, topping up or flushing brake fluid, or fixing hydraulic system leaks.

7. How much does it cost to fix the C1256 code on a Lexus?

Repair costs vary widely but can range from $500 to $3,000, depending on whether the brake actuator or accumulator needs replacement.

8. Can low brake fluid cause the C1256 code?

Yes, low brake fluid can trigger the C1256 code by reducing hydraulic pressure in the braking system.

9. What tools are needed to troubleshoot the C1256 code on a Lexus?

Youâ€™ll need an OBDII scan tool capable of reading ABS codes, a brake fluid tester, and potentially a pressure gauge for testing the hydraulic system.

10. Is the C1256 code specific to Lexus vehicles?

While the code can appear on other manufacturers, it is commonly associated with Lexus and Toyota vehicles due to their specific brake actuator designs.