AutoCodes – Buick – C128A Buick

C128A Buick Code - ABS Boost Pressure Sensor Offset Error

Quick Answer

The Electronic Brake Control Module (EBCM) uses input from the boost pressure sensor for more accurate control during brake and vehicle stability enhancement system event. Common causes include Faulty Brake Pressure Modulator, Brake Pressure Modulator harness is open or shorted, Brake Pressure Modulator 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: C128A Buick indicates ABS Boost Pressure Sensor Offset Error.
Common causes: Common causes include Faulty Brake Pressure Modulator, Brake Pressure Modulator harness is open or shorted, Brake Pressure Modulator 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 794

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C128A Buick Description

The Electronic Brake Control Module (EBCM) uses input from the boost pressure sensor for more accurate control during brake and vehicle stability enhancement system event. The boost pressure sensor is internal to the brake pressure modulator.

OBDII Code C128A Buick - ABS Boost Pressure Sensor Offset Error - AutoCodes.com — C128A Buick Code - ABS Boost Pressure Sensor Offset Error

What does this mean?

What are the Possible Causes of the DTC C128A Buick?

Faulty Brake Pressure Modulator
Brake Pressure Modulator harness is open or shorted
Brake Pressure Modulator circuit poor electrical connection

How to Fix the DTC C128A Buick?

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 C128A Buick 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.

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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 C128A Buick Code

1. What are the common symptoms of OBDII code C128A in a Buick related to the ABS Boost Pressure Sensor Offset Error?

The common symptoms include the ABS warning light being illuminated on the dashboard, decreased braking performance, and potential issues with the vehicle's stability control system.

2. What typically causes the ABS Boost Pressure Sensor Offset Error (C128A) in a Buick?

The error code C128A is usually triggered by a faulty ABS boost pressure sensor or issues with the sensor's calibration and offset settings.

3. How can I diagnose the ABS Boost Pressure Sensor Offset Error in my Buick?

Diagnosing the issue involves using a diagnostic scanner to read the OBDII codes, testing the ABS boost pressure sensor for proper functioning, and checking the sensor's wiring and connections for any faults.

4. Can I continue driving my Buick with the ABS Boost Pressure Sensor Offset Error code present?

It is not recommended to drive the vehicle with the ABS error code C128A active, as it can affect the proper functioning of the vehicle's anti-lock braking system and compromise safety.

5. How can I repair the ABS Boost Pressure Sensor Offset Error in my Buick?

Repairing the issue typically involves replacing the faulty ABS boost pressure sensor, recalibrating the sensor, and clearing the error code using a diagnostic scanner.

6. Are there any DIY tips for fixing the ABS Boost Pressure Sensor Offset Error in a Buick?

While some basic troubleshooting steps can be done at home, repairing the ABS boost pressure sensor error usually requires specialized tools and knowledge, making it advisable to seek professional help.

7. How much does it cost to fix the ABS Boost Pressure Sensor Offset Error in a Buick?

The cost of fixing the ABS error code C128A can vary depending on the extent of the issue, the price of the replacement sensor, and labor costs at the repair shop. It's recommended to get a few quotes from different mechanics.

8. Can a faulty ABS boost pressure sensor cause other problems in my Buick?

Yes, a faulty ABS boost pressure sensor can lead to issues with the vehicle's braking system, stability control, and overall safety features, making it crucial to address the problem promptly.

9. Is the ABS Boost Pressure Sensor Offset Error a common issue in Buick vehicles?

While not extremely common, the ABS error code C128A related to the boost pressure sensor can occur in Buick vehicles, especially as they age and the sensor wears out.

10. How can I prevent the ABS Boost Pressure Sensor Offset Error from occurring in my Buick in the future?

Regular maintenance, including checking the ABS system components and sensors during routine inspections, can help prevent issues like the ABS boost pressure sensor offset error in your Buick.