C128B 2016 GMC Sierra 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 2016 GMC Sierra 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.
Code C128B 2016 GMC Sierra Description
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.
What are the Possible Causes of the DTC C128B 2016 GMC Sierra?
- 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 2016 GMC Sierra?
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 2016 GMC Sierra 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 2016 GMC Sierra code?
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Frequently Asked Questions about C128B 2016 GMC Sierra Code
1. What does OBDII code C128B for a 2016 GMC Sierra indicate?
The C128B code specifically points to an ABS Master Cylinder Pressure Sensor Offset Error in the vehicle's anti-lock braking system.
2. What are common symptoms of a C128B code in a 2016 GMC Sierra?
Common symptoms may include the illumination of the ABS warning light on the dashboard, potential loss of ABS functionality, and issues with the vehicle's braking system.
3. What are some possible causes of the ABS Master Cylinder Pressure Sensor Offset Error in a 2016 GMC Sierra?
Possible causes of the C128B code include a malfunctioning pressure sensor, wiring or connector issues, low brake fluid levels, or a faulty ABS control module.
4. How can I diagnose the ABS Master Cylinder Pressure Sensor Offset Error in my 2016 GMC Sierra?
Diagnosing the C128B code may involve using an OBDII scanner to retrieve the fault codes, inspecting the ABS system components for any visible damage, and testing the pressure sensor and related wiring for continuity and proper function.
5. Can I drive my 2016 GMC Sierra with a C128B fault code?
It is not recommended to drive the vehicle with a C128B code present, as it may affect the proper functioning of the anti-lock braking system, potentially compromising safety.
6. How can I repair the ABS Master Cylinder Pressure Sensor Offset Error in my 2016 GMC Sierra?
Repairing the C128B code may involve replacing the faulty pressure sensor, repairing any damaged wiring or connectors, checking and topping up brake fluid levels, or reprogramming the ABS control module.
7. Is it necessary to reset the ABS system after repairing a C128B fault code?
Yes, it is recommended to reset the ABS system after repairing the C128B fault code to clear the error codes and ensure proper functionality of the anti-lock braking system.
8. Can a DIY enthusiast fix the ABS Master Cylinder Pressure Sensor Offset Error in a 2016 GMC Sierra?
While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing the C128B code may require specialized tools and expertise, so it is advisable to seek professional help for complex issues.
9. How much does it typically cost to repair a C128B fault code in a 2016 GMC Sierra?
The cost of repairing a C128B fault code can vary depending on the exact cause of the issue, the cost of replacement parts, and labor charges. It is recommended to obtain quotes from reputable auto repair shops for an accurate estimate.
10. Are there any preventive maintenance tips to avoid the ABS Master Cylinder Pressure Sensor Offset Error in a 2016 GMC Sierra?
To prevent issues related to the C128B code, regular maintenance of the vehicle's braking system, including checking brake fluid levels, inspecting sensors and wiring, and addressing any warning lights promptly, can help maintain the ABS system's health.
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