AutoCodes – GMC – C12B1 2016 GMC Sierra

C12B1 2016 GMC Sierra Code - ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor Not Plausible

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: C12B1 2016 GMC Sierra indicates ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor Not Plausible.
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 216

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 C12B1 2016 GMC Sierra 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 C12B1 2016 GMC Sierra - ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor Not Plausible - AutoCodes.com — C12B1 2016 GMC Sierra Code - ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor Not Plausible

What does this mean?

What are the Possible Causes of the DTC C12B1 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 C12B1 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 C12B1 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 C12B1 2016 GMC Sierra code?

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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 C12B1 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code C12B1 in a 2016 GMC Sierra related to the ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor?

The common symptoms include the ABS warning light being illuminated on the dashboard, potential loss of ABS functionality, and possible issues with brake performance.

2. What could cause the ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor to trigger the C12B1 code in a 2016 GMC Sierra?

Potential causes include faulty sensors, wiring issues, sensor calibration problems, or a malfunction in the ABS control module.

3. How can I diagnose the ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor issues leading to the C12B1 code in my 2016 GMC Sierra?

Diagnosis involves using an OBDII scanner to retrieve the specific fault codes, inspecting the sensors and related wiring for damage, and testing sensor functionality using a multimeter.

4. Is it safe to continue driving my 2016 GMC Sierra with the C12B1 code related to the ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor?

It is not recommended to drive the vehicle with this code present, as it may affect the ABS system's proper operation and compromise overall braking performance.

5. Can I repair the ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor issues triggering the C12B1 code in my 2016 GMC Sierra myself?

While basic inspections like checking wiring connections can be done by DIY enthusiasts, troubleshooting and replacing sensors should be left to experienced mechanics due to the complexity of ABS systems.

6. How much does it typically cost to repair the ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor issues causing the C12B1 code in a 2016 GMC Sierra?

Repair costs can vary depending on the exact cause of the issue, but they may range from a couple of hundred to a thousand dollars, including parts and labor.

7. Are there any temporary fixes or workarounds for the ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor issues associated with the C12B1 code in my 2016 GMC Sierra?

There are no recommended temporary fixes for this issue, as addressing the root cause through proper diagnosis and repair is essential for maintaining the safety and functionality of the ABS system.

8. What are the implications of ignoring the C12B1 code related to the ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor in a 2016 GMC Sierra?

Ignoring this code can lead to potential brake system malfunctions, compromised safety during braking, and possible further damage to the ABS components over time.

9. Can a faulty ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor triggering the C12B1 code affect other systems in my 2016 GMC Sierra?

Yes, a malfunctioning ABS system can impact other vehicle systems, such as traction control, stability control, and overall brake performance, highlighting the importance of timely repairs.

10. How long does it typically take to repair the ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor issues causing the C12B1 code in a 2016 GMC Sierra?

The repair time can vary based on the extent of the issue and availability of parts, but it may take a few hours to a day for a skilled mechanic to diagnose and fix the problem.