AutoCodes – Lexus – C1252 Lexus

C1252 Lexus Code - Brake Booster Pump Motor ON Time Abnormally Long

Quick Answer

The Skid Control ECU detects decreases in the accumulator pressure according to the data from the accumulator pressure sensor, and then starts and stops the pump motor by operating the motor relay. Common causes include Faulty Brake Actuator Assembly, Brake Actuator Assembly harness is open or shorted, Brake Actuator Assembly 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: C1252 Lexus indicates Brake Booster Pump Motor ON Time Abnormally Long.
Common causes: Common causes include Faulty Brake Actuator Assembly, Brake Actuator Assembly harness is open or shorted, Brake Actuator Assembly 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.

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Code Popularity 15,311

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 30, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1252 Lexus Description

The Skid Control ECU detects decreases in the accumulator pressure according to the data from the accumulator pressure sensor, and then starts and stops the pump motor by operating the motor relay. The Skid Control ECU usually drives the motor relay 1 for ECB control, and the motor relay 2 for ABS control. If either is malfunctioning, the other substitutes.

OBDII Code C1252 Lexus - Brake Booster Pump Motor ON Time Abnormally Long - AutoCodes.com — C1252 Lexus Code - Brake Booster Pump Motor ON Time Abnormally Long

What does this mean?

What are the Possible Causes of the DTC C1252 Lexus?

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

How to Fix the DTC C1252 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 C1252 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 C1252 Lexus code?

Need more information on how to fix the C1252 Lexus code? Get Access to Factory Service Manuals

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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 C1252 Lexus Code

1. What does OBDII code C1252 mean on a Lexus?

C1252 indicates that the brake booster pump motor is taking too long to run, suggesting a potential issue with the brake booster system.

2. What are the common symptoms of code C1252 in a Lexus?

Symptoms may include a warning light on the dashboard, reduced braking performance, unusual noises from the brake booster, or a spongy brake pedal feel.

3. What causes the C1252 code to appear?

Common causes include a failing brake booster pump motor, leaks in the brake booster system, a clogged brake fluid line, or a faulty pressure sensor.

4. Can I still drive my Lexus with a C1252 code?

Itâ€™s not recommended, as the code indicates a potential braking issue that could compromise safety. Have the vehicle inspected and repaired promptly.

5. How is the C1252 code diagnosed on a Lexus?

A technician will use a scan tool to confirm the code, inspect the brake booster pump motor, check for leaks, and test the brake system pressure.

6. How do you fix the C1252 code on a Lexus?

Repairs may involve replacing the brake booster pump motor, fixing leaks, flushing the brake fluid, or replacing a faulty pressure sensor.

7. What is the cost of repairing a C1252 code on a Lexus?

Costs vary depending on the exact issue but typically range from $300 to $1,000, including parts and labor.

8. Can a brake fluid issue trigger the C1252 code?

Yes, low or contaminated brake fluid can cause the brake booster pump motor to run longer than normal, triggering the code.

9. Does the C1252 code mean the brake booster pump motor is failing?

Not always. While itâ€™s a common cause, the issue could also be due to leaks, sensor failures, or fluid problems in the brake booster system.

10. Can I fix the C1252 code on my Lexus myself?

If you have experience working with brake systems, you can attempt basic troubleshooting like checking for leaks and brake fluid levels. However, most repairs for this code require professional expertise.