AutoCodes – GMC – C0299 2014 GMC Sierra

C0299 2014 GMC Sierra Code - Brake Booster Large Vacuum Leak Detected

Quick Answer

The brake booster vacuum sensor measures the vacuum in the brake booster assembly. Common causes include Vacuum leak at the brake booster, Faulty Brake Booster Vacuum Sensor, Brake Booster Vacuum Sensor harness is open or shorted. 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: C0299 2014 GMC Sierra indicates Brake Booster Large Vacuum Leak Detected.
Common causes: Common causes include Vacuum leak at the brake booster, Faulty Brake Booster Vacuum Sensor, Brake Booster Vacuum Sensor harness is open or shorted.
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 505

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 05, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0299 2014 GMC Sierra Description

The brake booster vacuum sensor measures the vacuum in the brake booster assembly. The Electronic Brake Control Module (EBCM) supplies a 5 V reference and a low reference circuit to the brake booster vacuum sensor. The vacuum sensor supplies a voltage signal in relation to the pressure in the brake booster to the Electronic Brake Control Module. The Diagnostic Trouble Code (DTC) will be set when the Electronic Brake Control Module detected a too-low vacuum in the brake booster assembly.

OBDII Code C0299 2014 GMC Sierra - Brake Booster Large Vacuum Leak Detected - AutoCodes.com — C0299 2014 GMC Sierra Code - Brake Booster Large Vacuum Leak Detected

What does this mean?

What are the Possible Causes of the DTC C0299 2014 GMC Sierra?

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

How to Fix the DTC C0299 2014 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 C0299 2014 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 C0299 2014 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 C0299 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code C0299 in a 2014 GMC Sierra?

The common symptoms include a hissing noise when applying the brakes, a soft or spongy brake pedal feel, and potentially reduced braking performance.

2. What does the OBDII code C0299 mean for a 2014 GMC Sierra?

The code C0299 indicates that the Brake Booster Large Vacuum Leak has been detected in the vehicle.

3. What are the possible causes of the Brake Booster Large Vacuum Leak in a 2014 GMC Sierra?

Possible causes include a damaged or deteriorated brake booster diaphragm, a loose or disconnected vacuum hose, or a faulty vacuum pump.

4. How can I diagnose the Brake Booster Large Vacuum Leak in my 2014 GMC Sierra?

You can visually inspect the vacuum hoses and connections for any signs of damage or disconnection. A smoke test can also help identify the source of the leak.

5. Can I still drive my 2014 GMC Sierra with the Brake Booster Large Vacuum Leak code?

It is not recommended to drive the vehicle with this code as it can affect the braking performance and compromise safety. It is best to address the issue promptly.

6. How can I repair the Brake Booster Large Vacuum Leak in my 2014 GMC Sierra?

Repair options may include replacing the brake booster assembly, repairing or replacing the vacuum hoses, or addressing any other identified issues causing the vacuum leak.

7. Is it possible to clear the OBDII code C0299 in a 2014 GMC Sierra without fixing the issue?

Clearing the code without addressing the underlying problem will only temporarily remove the warning light. The code will likely return until the vacuum leak is repaired.

8. Are there any DIY repair tips for fixing the Brake Booster Large Vacuum Leak in a 2014 GMC Sierra?

While some may attempt to fix minor vacuum leaks themselves, it is recommended to consult a professional mechanic for proper diagnosis and repair of the brake booster system.

9. How much does it typically cost to repair the Brake Booster Large Vacuum Leak in a 2014 GMC Sierra?

The cost of repair can vary depending on the extent of the issue and the specific components that need to be replaced. It is advisable to obtain quotes from reputable mechanics or dealerships.

10. Can a faulty Brake Booster Large Vacuum Leak affect other systems in a 2014 GMC Sierra?

Yes, a large vacuum leak in the brake booster system can potentially impact the performance of other vehicle systems that rely on vacuum pressure, such as the HVAC system or emissions control components.