C0299 GMC 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 GMC 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.
Code C0299 GMC Description
What are the Possible Causes of the DTC C0299 GMC?
- 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 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 C0299 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.
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Information for Specific GMC Models
- C0299 2014 GMC Sierra — Brake Booster Large Vacuum Leak Detected
- C0299 2015 GMC Sierra — Brake Booster Large Vacuum Leak Detected
- C0299 2016 GMC Sierra — Brake Booster Large Vacuum Leak Detected
- C0299 2017 GMC Sierra — Brake Booster Large Vacuum Leak Detected
- C0299 2018 GMC Sierra — Brake Booster Large Vacuum Leak Detected
Frequently Asked Questions about C0299 GMC Code
1. What are the common symptoms of OBDII code C0299 Brake Booster Large Vacuum Leak Detected in a GMC vehicle?
- Common symptoms include a hissing noise when pressing the brake pedal, reduced braking performance, and the illumination of the check engine light.
2. What are the possible causes of OBDII code C0299 in a GMC, indicating a large vacuum leak in the brake booster system?
- Potential causes include a damaged brake booster diaphragm, disconnected or cracked vacuum hoses, or a faulty brake booster check valve.
3. How can I diagnose a large vacuum leak in the brake booster system triggering OBDII code C0299 in my GMC?
- You can visually inspect the vacuum hoses and connections for any signs of damage, listen for hissing sounds when pressing the brake pedal, and use a smoke machine to pinpoint the source of the leak.
4. Can a failing brake booster itself cause OBDII code C0299 to appear in a GMC?
- Yes, a failing brake booster with a damaged diaphragm can lead to a large vacuum leak, triggering the C0299 code in the GMC's onboard diagnostic system.
5. What are some repair tips for addressing OBDII code C0299 Brake Booster Large Vacuum Leak Detected in a GMC?
- Repair tips include replacing damaged vacuum hoses, checking and replacing the brake booster check valve if necessary, and ultimately replacing the brake booster if it is found to be faulty.
6. Is it safe to continue driving my GMC with OBDII code C0299 indicating a large vacuum leak in the brake booster system?
- It is not recommended to drive the vehicle with a large vacuum leak in the brake booster system, as it can compromise braking performance and safety. Immediate attention and repair are necessary.
7. Can a DIY enthusiast with basic automotive knowledge fix OBDII code C0299 related to a brake booster vacuum leak in a GMC?
- Depending on the extent of the issue, a DIY enthusiast with basic automotive knowledge may be able to address the problem by inspecting and replacing damaged vacuum hoses or the brake booster check valve. However, more complex repairs may require professional assistance.
8. How much can I expect to pay for repairing OBDII code C0299 Brake Booster Large Vacuum Leak Detected in a GMC at a mechanic or dealership?
- The cost of repairing OBDII code C0299 in a GMC can vary depending on the specific issue and the labor rates of the mechanic or dealership. It is recommended to obtain quotes from different service providers for comparison.
9. Will resetting the check engine light make OBDII code C0299 disappear temporarily in a GMC?
- Resetting the check engine light may temporarily make the code disappear, but if the underlying issue causing the large vacuum leak in the brake booster system is not addressed, the code is likely to reappear upon further driving.
10. Are there any preventive measures I can take to avoid OBDII code C0299 related to a brake booster vacuum leak in my GMC in the future?
- Regularly inspecting the brake booster system for any signs of wear or damage, promptly addressing any strange noises or brake performance issues, and following the manufacturer's recommended maintenance schedule can help prevent OBDII code C0299 from occurring.
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