AutoCodes – Generic – C12FF

C12FF Code - Brake Booster Performance

Quick Answer

The Electronic Brake Control Module (EBCM) uses input from the brake master cylinder piston position sensor and the brake switch to determine when the brake pedal is being applied and with how much force. Common causes include Vacuum leak at the brake booster, Faulty Vacuum Brake Booster Check Valve, Faulty Electronic Brake Control Module (EBCM). 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: C12FF indicates Brake Booster Performance.
Common causes: Common causes include Vacuum leak at the brake booster, Faulty Vacuum Brake Booster Check Valve, Faulty Electronic Brake Control Module (EBCM).
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 2,696

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 Sep 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C12FF Description

The Electronic Brake Control Module (EBCM) uses input from the brake master cylinder piston position sensor and the brake switch to determine when the brake pedal is being applied and with how much force. These inputs are used to determine the driver's braking intent which is used to the control amount of pressure applied to the wheels. The EBCM monitors the vacuum level in the power brake booster and will set a Diagnostic Trouble Code (DTC) if the vacuum is too low.

OBDII Code C12FF - Brake Booster Performance - AutoCodes.com — C12FF Code - Brake Booster Performance

What does this mean?

What are the Possible Causes of the DTC C12FF?

Vacuum leak at the brake booster
Faulty Vacuum Brake Booster Check Valve
Faulty Electronic Brake Control Module (EBCM)
Electronic Brake Control Module (EBCM) harness is open or shorted
Electronic Brake Control Module (EBCM) circuit poor electrical connection

How to Fix the DTC C12FF?

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 C12FF 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 C12FF code?

Need more information on how to fix the C12FF code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C12FF code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C12FF Buick — Brake Booster Performance
C12FF Cadillac — Brake Booster Performance
C12FF Chevrolet — Brake Booster Performance
C12FF GMC — Brake Booster Performance

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 C12FF Code

1. What are the common symptoms of OBDII code C12FF (Brake Booster Performance)?

- Common symptoms include a spongy brake pedal, difficulty in applying brakes, and potential loss of brake assist.

2. What are the possible causes of OBDII code C12FF?

- The code C12FF is often triggered by issues with the brake booster vacuum system, such as leaks, blockages, or a faulty brake booster sensor.

3. How can I diagnose the cause of OBDII code C12FF?

- To diagnose the issue, you can perform a visual inspection of the brake booster system, check for vacuum leaks, test the brake booster sensor, and use a scan tool to monitor brake booster performance data.

4. Can I still drive my vehicle with OBDII code C12FF present?

- It is not recommended to drive the vehicle with the C12FF code active, as it may affect the performance of the braking system and compromise safety.

5. How can I repair OBDII code C12FF (Brake Booster Performance) myself?

- Depending on the underlying issue, you may need to repair or replace components such as the brake booster, vacuum lines, brake booster sensor, or vacuum pump to resolve the C12FF code.

6. Is it necessary to reset the OBDII code C12FF after making repairs?

- Yes, it is crucial to clear the C12FF code after repairing the underlying issue to reset the system and ensure proper functioning of the brake booster.

7. How much does it typically cost to repair OBDII code C12FF?

- The cost of repairing OBDII code C12FF can vary depending on the specific cause of the issue, but it may range from $200 to $600, including parts and labor.

8. Can a faulty brake booster affect other vehicle systems?

- Yes, a faulty brake booster can impact other vehicle systems, such as the ABS (Anti-lock Braking System) and traction control, due to its role in providing brake assist.

9. Are there any preventive maintenance tips to avoid OBDII code C12FF?

- Regularly inspecting and maintaining the brake booster system, checking for vacuum leaks, and replacing worn components can help prevent issues leading to the C12FF code.

10. How long does it typically take to repair OBDII code C12FF?

- The repair time for OBDII code C12FF can vary depending on the extent of the issue and the availability of parts, but it may take anywhere from 1 to 3 hours at a repair shop.