P0299 2017 GMC Sierra 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 2017 GMC Sierra 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 2017 GMC Sierra Description
What are the Possible Causes of the DTC P0299 2017 GMC Sierra?
- 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 2017 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 P0299 2017 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.
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Frequently Asked Questions about P0299 2017 GMC Sierra Code
1. What does the OBDII code P0299 mean on a 2017 GMC Sierra?
P0299 indicates that the Engine Control Module (ECM) has detected lower-than-expected turbocharger or supercharger boost pressure.
2. What are the common symptoms of code P0299 in a 2017 GMC Sierra?
Symptoms may include reduced engine power, poor acceleration, black smoke from the exhaust, a whining noise from the turbo, and the Check Engine Light turning on.
3. What causes the P0299 code on a 2017 GMC Sierra?
Potential causes include a malfunctioning turbocharger, a boost pressure leak, a faulty wastegate actuator, clogged air intake or exhaust components, or a failing MAP sensor.
4. Can I drive my 2017 GMC Sierra with a P0299 code?
While it may still be drivable, operating the vehicle with this code can lead to further engine damage or reduced performance. It’s best to address the issue promptly.
5. How do I diagnose the P0299 code on a 2017 GMC Sierra?
Diagnosis typically involves inspecting the turbocharger, checking for boost leaks in the intake system, testing the wastegate actuator, and verifying the functionality of the MAP and boost pressure sensors.
6. How can a boost leak cause the P0299 code?
A boost leak in the intake system reduces the amount of compressed air reaching the engine, causing the ECM to detect insufficient boost pressure and trigger the P0299 code.
7. What repairs are needed to fix the P0299 code on a 2017 GMC Sierra?
Repairs may include replacing the turbocharger, fixing boost leaks, cleaning or replacing clogged intake/exhaust components, repairing the wastegate actuator, or replacing faulty sensors.
8. How much does it cost to fix the P0299 code on a 2017 GMC Sierra?
Repair costs vary depending on the cause but can range from $100 for simple fixes like hose replacements to over $1,000 for turbocharger replacement.
9. Can a dirty air filter cause the P0299 code?
Yes, a clogged air filter can restrict airflow to the turbocharger, leading to insufficient boost pressure and triggering the P0299 code.
10. Will clearing the P0299 code fix the problem?
Clearing the code may turn off the Check Engine Light temporarily, but the underlying issue must be diagnosed and repaired to prevent the code from returning.
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