C12B1 2017 GMC Sierra Code - ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor Not Plausible
Quick Answer
The C12B1 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that there is a discrepancy between the readings from the ABS master cylinder pressure sensor and the brake pedal position sensor. Common causes include Faulty ABS master cylinder pressure sensor, Malfunctioning brake pedal position sensor, Wiring or connection issues between the sensors and the vehicle's computer. 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 2017 GMC Sierra indicates ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor Not Plausible.
- Common causes
- Common causes include Faulty ABS master cylinder pressure sensor, Malfunctioning brake pedal position sensor, Wiring or connection issues between the sensors and the vehicle's computer.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code C12B1 2017 GMC Sierra Description
The C12B1 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that there is a discrepancy between the readings from the ABS master cylinder pressure sensor and the brake pedal position sensor. This means that the information being received by the vehicle's computer from these two sensors does not align, which can lead to potential issues with the vehicle's braking system. The ABS master cylinder pressure sensor is responsible for measuring the hydraulic pressure in the brake system, while the brake pedal position sensor detects the position of the brake pedal to determine the driver's braking intentions.
Common Causes of C12B1 2017 GMC Sierra
- Faulty ABS master cylinder pressure sensor
- Malfunctioning brake pedal position sensor
- Wiring or connection issues between the sensors and the vehicle's computer
- Low brake fluid levels
- Contaminated brake fluid affecting sensor readings
Symptoms of C12B1 2017 GMC Sierra
- ABS warning light illuminated on the dashboard
- Brake pedal feels spongy or unresponsive
- Increased stopping distances
- Stability control system malfunctions
- Inconsistent braking performance
How to Fix C12B1 2017 GMC Sierra
- Diagnose the issue by using a scan tool to retrieve the specific DTC and identify the root cause of the problem.
- Inspect the ABS master cylinder pressure sensor and brake pedal position sensor for any signs of damage or malfunction.
- Check the wiring and connections between the sensors and the vehicle's computer for any loose connections or corrosion.
- Replace any faulty sensors or components, ensuring proper installation and calibration.
- Clear the DTC from the vehicle's computer and perform a test drive to verify that the issue has been resolved.
Cost to Fix C12B1 2017 GMC Sierra
The cost of repairing the ABS master cylinder pressure sensor and brake pedal position sensor on a 2017 GMC Sierra can vary depending on the specific parts needed, the labor rates of the auto repair shop, and any additional repairs or maintenance required. On average, the parts for these sensors can range from $100 to $300 each, not including labor costs. The total repair cost, including parts and labor, can range from $300 to $800 or more.
Need more information about the C12B1 2017 GMC Sierra code?
Need more information on how to fix the C12B1 2017 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the C12B1 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about C12B1 2017 GMC Sierra Code
1. What does the OBDII code C12B1 mean on a 2017 GMC Sierra?
C12B1 indicates an issue where the ABS master cylinder pressure sensor and the brake pedal position sensor readings are not plausible or consistent with each other.
2. What are the common symptoms of code C12B1?
Symptoms may include the ABS or brake warning light illuminating, reduced or disabled ABS functionality, unusual brake pedal feel, and possible loss of brake assist.
3. What causes the C12B1 code to appear?
The code can be triggered by a faulty master cylinder pressure sensor, a malfunctioning brake pedal position sensor, wiring issues, or a problem with the ABS module.
4. Can I drive my 2017 GMC Sierra with the C12B1 code?
While the vehicle may still be operable, it is not recommended to drive with this code active as ABS functionality may be compromised, increasing the risk of accidents during sudden braking.
5. How do you diagnose the C12B1 code?
Diagnosis involves scanning the vehicle with an OBDII scanner, inspecting the wiring and connectors for damage, verifying sensor output readings, and checking the ABS module for faults.
6. How do you fix the C12B1 code?
Repairs may include replacing a faulty master cylinder pressure sensor or brake pedal position sensor, repairing damaged wiring, or recalibrating the sensors using a professional diagnostic tool.
7. Is sensor recalibration required after fixing the C12B1 issue?
Yes, recalibration of the brake pedal position sensor and ABS system may be necessary to ensure proper functionality and clear the code.
8. What tools are needed to repair the C12B1 code?
You may need an OBDII scanner, a multimeter to test electrical connections, and possibly GM-specific diagnostic tools for sensor calibration.
9. How much does it cost to fix the C12B1 code?
Repair costs vary depending on the issue but may range from $150 to $500, including parts and labor, with higher costs if ABS module replacement is required.
10. Can a software update fix the C12B1 code?
In some cases, a software update for the vehicle’s ABS module may resolve compatibility issues between sensors, but this depends on the specific circumstances and should be verified by a technician.
Discuss the causes and fixes for C12B1 2017 GMC Sierra OBDII Code
Code C12B1 2017 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.