C12F8 GMC Code - Brake Pedal Position Sensor 3 Not Plausible
Quick Answer
The Electronic Brake Control Module (EBCM) 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 Brake Pedal Position Sensor, Brake Pedal Position Sensor harness is open or shorted, Brake Pedal Position Sensor 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
- C12F8 GMC indicates Brake Pedal Position Sensor 3 Not Plausible.
- Common causes
- Common causes include Faulty Brake Pedal Position Sensor, Brake Pedal Position Sensor harness is open or shorted, Brake Pedal Position Sensor 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 C12F8 GMC Description
What are the Possible Causes of the DTC C12F8 GMC?
- Faulty Brake Pedal Position Sensor
- Brake Pedal Position Sensor harness is open or shorted
- Brake Pedal Position Sensor circuit poor electrical connection
- Faulty Electronic Brake Control Module (EBCM)
How to Fix the DTC C12F8 GMC?
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 C12F8 GMC 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 C12F8 GMC code?
Need more information on how to fix the C12F8 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the C12F8 GMC code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about C12F8 GMC Code
1. What does the OBDII code C12F8 on a GMC vehicle mean?
The C12F8 code indicates that the Brake Pedal Position Sensor 3 is providing a signal that is not plausible or consistent with expected values.
2. What are the symptoms of the C12F8 code on a GMC?
Common symptoms include the illumination of the ABS or traction control warning light, reduced braking performance, and erratic brake system behavior.
3. What causes the C12F8 code to appear?
The code can be caused by a faulty brake pedal position sensor, damaged wiring or connectors, or issues with the vehicle’s ABS control module.
4. Can I drive my GMC with the C12F8 code active?
While the vehicle may still be drivable, it’s not recommended as braking system performance and safety features like ABS or traction control may be compromised.
5. How do I diagnose the C12F8 code on my GMC?
Diagnose the code by scanning for additional fault codes, inspecting the brake pedal position sensor and its wiring, and testing the sensor’s output with a multimeter.
6. How do I fix the C12F8 code on a GMC vehicle?
Repairs may involve replacing the faulty brake pedal position sensor, repairing damaged wiring, or recalibrating the ABS control module.
7. Is the brake pedal position sensor the same as a brake light switch?
No, the brake pedal position sensor monitors the pedal’s position for the ABS and traction control systems, while the brake light switch controls the brake lights.
8. How much does it cost to fix the C12F8 code on a GMC?
Repair costs vary, but replacing the brake pedal position sensor typically costs between $150 and $300, including parts and labor.
9. Can a dead battery cause the C12F8 code to appear?
While unlikely, a weak or dead battery can cause voltage irregularities that might trigger sensor-related codes, though it’s not a common cause for C12F8.
10. Do I need to recalibrate the brake pedal position sensor after replacement?
Yes, many GMC vehicles require the brake pedal position sensor to be recalibrated after replacement to ensure proper function.
Discuss the causes and fixes for C12F8 GMC OBDII Code
Code C12F8 GMC 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.
