P0299 GMC Code - Engine Underboost
Quick Answer
The Engine Control Module (ECM) uses the Manifold Absolute Pressure (MAP) sensor input and turbocharger actuator output to control the amount of engine induction system boost pressure. Common causes include Faulty Turbocharger Vane Position Actuator, Air leaks between the turbocharger and the intake air flow valve, Airflow restrictions in air ducts or air filter. 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
- P0299 GMC indicates Engine Underboost.
- Common causes
- Common causes include Faulty Turbocharger Vane Position Actuator, Air leaks between the turbocharger and the intake air flow valve, Airflow restrictions in air ducts or air filter.
- 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 P0299 GMC Description
What are the Possible Causes of the DTC P0299 GMC?
- Faulty Turbocharger Vane Position Actuator
- Air leaks between the turbocharger and the intake air flow valve
- Airflow restrictions in air ducts or air filter
- Ice or debris in the induction system
- Leaks at the Positive Crankcase Ventilation (PCV) system
- Faulty Turbocharger
How to Fix the DTC P0299 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.
Code Tech Notes
2010 GMC Savana
2011 GMC Savana
2011 GMC Sierra
GMC Factory Service Bulletin OBDII Code P0299
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0299 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 P0299 GMC code?
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Need Help with the Code?
Get the P0299 GMC code diagnosed by a professional: Find a repair shop in your area
Information for Specific GMC Models
- P0299 2014 GMC Sierra — Engine Underboost
- P0299 2015 GMC Sierra — Engine Underboost
- P0299 2016 GMC Sierra — Engine Underboost
- P0299 2017 GMC Sierra — Engine Underboost
- P0299 2018 GMC Sierra — Engine Underboost
Frequently Asked Questions about P0299 GMC Code
1. What are the common symptoms of OBDII code P0299 in a GMC vehicle?
- Common symptoms of code P0299, indicating engine underboost, include reduced engine power, hesitation or lack of acceleration, and an illuminated check engine light.
2. What are the possible causes of OBDII code P0299 in a GMC vehicle?
- The code P0299 in a GMC vehicle can be caused by issues such as a faulty turbocharger, wastegate malfunction, boost pressure sensor failure, or a leak in the intake system.
3. How can I diagnose the cause of OBDII code P0299 in my GMC vehicle?
- Diagnosing code P0299 typically involves checking the turbocharger system for leaks, inspecting the wastegate operation, testing the boost pressure sensor, and ensuring proper airflow in the intake system.
4. Can driving with OBDII code P0299 in a GMC vehicle cause further damage?
- Continuing to drive with code P0299 may lead to reduced fuel efficiency, potential engine damage from excessive stress, and further deterioration of the turbocharger system if the underlying issue is not addressed promptly.
5. What are some repair tips for fixing OBDII code P0299 in a GMC vehicle?
- Repair tips for addressing code P0299 may include cleaning or replacing the boost pressure sensor, repairing any leaks in the turbocharger system, checking and adjusting the wastegate, and ensuring proper airflow in the intake system.
6. Is it safe to clear the OBDII code P0299 in a GMC vehicle without fixing the underlying issue?
- Clearing the OBDII code P0299 without addressing the root cause is not recommended, as the issue may persist and potentially lead to more severe engine problems or safety hazards.
7. How much does it typically cost to repair OBDII code P0299 in a GMC vehicle?
- The cost of repairing code P0299 in a GMC vehicle can vary depending on the specific cause of the issue, but it may range from a few hundred dollars for sensor replacement to over a thousand dollars for turbocharger repairs.
8. Can a DIY enthusiast fix OBDII code P0299 in a GMC vehicle, or is professional assistance necessary?
- While some aspects of diagnosing and repairing code P0299 may be tackled by experienced DIY enthusiasts, dealing with turbocharger and intake system components often requires specialized tools and expertise, making professional assistance advisable.
9. Are there preventative maintenance steps to avoid OBDII code P0299 in a GMC vehicle?
- Regularly inspecting and maintaining the turbocharger system, checking for leaks in the intake system, and using high-quality fuel and oil can help prevent issues that may trigger code P0299 in a GMC vehicle.
10. How long can I safely drive with OBDII code P0299 in a GMC vehicle before getting it repaired?
- It is recommended to address OBDII code P0299 in a GMC vehicle as soon as possible to prevent potential engine damage and ensure safe and efficient operation. Driving should be minimized until the issue is resolved.
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