C12B1 2015 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 2015 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.
Code C12B1 2015 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 C12B1 2015 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 2015 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 2015 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 2015 GMC Sierra code?
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Frequently Asked Questions about C12B1 2015 GMC Sierra Code
1. What does OBDII code C12B1 on a 2015 GMC Sierra mean?
The code C12B1 indicates that there is a discrepancy between the readings from the ABS master cylinder pressure sensor and the brake pedal position sensor.
2. What are the common symptoms of ABS master cylinder pressure sensor and brake pedal position sensor not being plausible?
Common symptoms include the ABS warning light being illuminated on the dashboard, potential loss of ABS functionality, and issues with brake performance.
3. What are the possible causes of OBDII code C12B1 in a 2015 GMC Sierra?
Potential causes include faulty ABS master cylinder pressure sensor, malfunctioning brake pedal position sensor, wiring issues, or a problem with the ABS control module.
4. How can I diagnose the ABS master cylinder pressure sensor and brake pedal position sensor on a 2015 GMC Sierra?
Diagnosis involves using a professional OBDII scanner to read the specific fault codes, checking the sensors for proper operation, inspecting the wiring for any damage, and testing the ABS system.
5. Can I still drive my 2015 GMC Sierra with the C12B1 OBDII code?
It is not recommended to drive the vehicle with the ABS warning light on, as it may indicate a potential issue with the braking system that could compromise safety.
6. What are the repair options for OBDII code C12B1 in a 2015 GMC Sierra?
Repair options include replacing the faulty ABS master cylinder pressure sensor or brake pedal position sensor, repairing any damaged wiring, or seeking professional help for further diagnosis.
7. How much does it cost to fix the ABS master cylinder pressure sensor and brake pedal position sensor issue?
Costs can vary depending on the specific cause of the problem, parts needed for replacement, and labor charges. It is advisable to obtain quotes from reputable mechanics or dealerships.
8. Can I reset the OBDII code C12B1 in my 2015 GMC Sierra by disconnecting the battery?
While disconnecting the battery may temporarily clear the code, it is not a recommended fix. The underlying issue causing the code needs to be properly diagnosed and repaired.
9. Is it safe to continue driving if the ABS warning light is not illuminated despite having the C12B1 code in a 2015 GMC Sierra?
Even if the ABS warning light is not on, it is still important to address the underlying issue causing the code to prevent potential brake system failures.
10. How often should I check the ABS system in my 2015 GMC Sierra to prevent issues like the C12B1 code?
Regular maintenance checks, including inspecting the ABS system during routine service intervals, can help prevent issues like the C12B1 code from arising.
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