AutoCodes – Chevrolet – C128B 2014 Chevrolet Silverado

C128B 2014 Chevrolet Silverado Code - ABS Master Cylinder Pressure Sensor Offset Error

Quick Answer

The Electronic Brake Control Module uses inputs from the Electronic Brake Control Brake Pedal Position Sensor to determine when the brake is applied and how much force is used. Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module harness is open or shorted, Electronic Brake Control Module 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: C128B 2014 Chevrolet Silverado indicates ABS Master Cylinder Pressure Sensor Offset Error.
Common causes: Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module harness is open or shorted, Electronic Brake Control Module 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 161

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 Jul 13, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C128B 2014 Chevrolet Silverado Description

The Electronic Brake Control Module uses inputs from the Electronic Brake Control Brake Pedal Position Sensor to determine when the brake is applied and how much force is used. The Electronic Brake Control Module monitors when the driver's foot is on the brake and locks the offset. The offset is locked when three out of the four inputs indicate the brake pedal is applied. The four inputs are brake pedal travel 1, brake pedal travel 2, master cylinder pressure sensor, and brake pedal position sensor. These inputs are used to determine the driver's braking intent which is used to control the amount of pressure applied to the wheels.
Brake pressure sensor information is communicated from the Electronic Brake Control Module (EBCM) to the Hybrid Control Processor (HCP). This information is used to schedule regenerative braking and engine autostops.
The Diagnostic Trouble Code (DTC) will be set when the Engine Control Module (ECM) detects a corrupted data message from the Electronic Brake Control Module.

OBDII Code C128B 2014 Chevrolet Silverado - ABS Master Cylinder Pressure Sensor Offset Error - AutoCodes.com — C128B 2014 Chevrolet Silverado Code - ABS Master Cylinder Pressure Sensor Offset Error

What does this mean?

What are the Possible Causes of the DTC C128B 2014 Chevrolet Silverado?

Faulty Electronic Brake Control Module (EBCM)
Electronic Brake Control Module harness is open or shorted
Electronic Brake Control Module circuit poor electrical connection
Faulty Starter/Generator Control Module

How to Fix the DTC C128B 2014 Chevrolet Silverado?

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 C128B 2014 Chevrolet Silverado 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 C128B 2014 Chevrolet Silverado code?

Need more information on how to fix the C128B 2014 Chevrolet Silverado 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 C128B 2014 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code C128B in a 2014 Chevrolet Silverado?

The common symptoms of OBDII code C128B in a 2014 Chevrolet Silverado include the ABS warning light illuminating on the dashboard, potential loss of ABS functionality, and decreased braking performance.

2. What does the ABS Master Cylinder Pressure Sensor Offset Error (C128B) indicate in a 2014 Chevrolet Silverado?

The ABS Master Cylinder Pressure Sensor Offset Error (C128B) indicates that there is an offset error detected in the master cylinder pressure sensor of the ABS system in a 2014 Chevrolet Silverado.

3. What are the possible causes of OBDII code C128B in a 2014 Chevrolet Silverado?

Possible causes of OBDII code C128B in a 2014 Chevrolet Silverado include a faulty master cylinder pressure sensor, wiring issues, ABS module problems, or a malfunction in the ABS hydraulic unit.

4. How can I diagnose the ABS Master Cylinder Pressure Sensor Offset Error (C128B) in my 2014 Chevrolet Silverado?

Diagnosing the ABS Master Cylinder Pressure Sensor Offset Error (C128B) in a 2014 Chevrolet Silverado typically involves using an OBDII scanner to retrieve the specific trouble code, inspecting the ABS system components for any visible damage, and testing the master cylinder pressure sensor for proper functionality.

5. Can I drive my 2014 Chevrolet Silverado with OBDII code C128B?

It is not recommended to drive your 2014 Chevrolet Silverado with OBDII code C128B, as the ABS system may not function properly, leading to potential safety risks and compromised braking performance.

6. How can I repair the ABS Master Cylinder Pressure Sensor Offset Error (C128B) in my 2014 Chevrolet Silverado?

Repairing the ABS Master Cylinder Pressure Sensor Offset Error (C128B) in a 2014 Chevrolet Silverado may involve replacing the faulty master cylinder pressure sensor, repairing any damaged wiring, or addressing issues with the ABS module or hydraulic unit as needed.

7. Is it safe to continue driving if the ABS warning light is on due to code C128B in my 2014 Chevrolet Silverado?

It is not safe to continue driving if the ABS warning light is on due to code C128B in your 2014 Chevrolet Silverado, as it indicates a potential issue with the ABS system that could compromise your vehicle's braking performance.

8. How much does it typically cost to repair OBDII code C128B in a 2014 Chevrolet Silverado?

The cost of repairing OBDII code C128B in a 2014 Chevrolet Silverado can vary depending on the specific cause of the issue, but it may involve parts and labor costs ranging from $200 to $500 or more.

9. Can a DIY enthusiast fix OBDII code C128B in a 2014 Chevrolet Silverado?

While some DIY enthusiasts may be able to diagnose and repair OBDII code C128B in a 2014 Chevrolet Silverado, it is recommended to seek professional help, especially when dealing with complex ABS system components.

10. Will resetting the OBDII code C128B in my 2014 Chevrolet Silverado resolve the issue?

Simply resetting the OBDII code C128B in your 2014 Chevrolet Silverado will not resolve the underlying problem causing the ABS Master Cylinder Pressure Sensor Offset Error. It is crucial to diagnose and address the root cause of the issue for a proper repair.