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P0299 2016 GMC Sierra Code - Engine Underboost

Quick Answer

The P0299 diagnostic trouble code (DTC) in a 2016 GMC Sierra indicates that the engine is experiencing underboost, meaning that the turbocharger or supercharger is not providing the expected amount of boost pressure to the engine. Common causes include Boost leak: A leak in the intake system or intercooler can cause a loss of boost pressure, Faulty wastegate: The wastegate controls the amount of exhaust gas that reaches the turbocharger, and a malfunction can lead to underboost, Clogged air filter: A dirty or clogged air filter can restrict airflow to the turbocharger, resulting in underboost. 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 2016 GMC Sierra indicates Engine Underboost.
Common causes
Common causes include Boost leak: A leak in the intake system or intercooler can cause a loss of boost pressure, Faulty wastegate: The wastegate controls the amount of exhaust gas that reaches the turbocharger, and a malfunction can lead to underboost, Clogged air filter: A dirty or clogged air filter can restrict airflow to the turbocharger, resulting in underboost.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 29, 2024
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Code P0299 2016 GMC Sierra Description

The P0299 diagnostic trouble code (DTC) in a 2016 GMC Sierra indicates that the engine is experiencing underboost, meaning that the turbocharger or supercharger is not providing the expected amount of boost pressure to the engine. This can lead to a decrease in engine performance, reduced fuel efficiency, and potential long-term damage if left unaddressed. The turbocharger or supercharger is responsible for compressing air and forcing it into the engine's intake manifold to increase power output. When the engine is underboosted, it may struggle to produce the necessary power for acceleration and overall performance.

OBDII Code P0299 2016 GMC Sierra - Engine Underboost
P0299 2016 GMC Sierra Code - Engine Underboost

Common Causes of P0299 2016 GMC Sierra

  1. Boost leak: A leak in the intake system or intercooler can cause a loss of boost pressure.
  2. Faulty wastegate: The wastegate controls the amount of exhaust gas that reaches the turbocharger, and a malfunction can lead to underboost.
  3. Clogged air filter: A dirty or clogged air filter can restrict airflow to the turbocharger, resulting in underboost.
  4. Faulty turbocharger/supercharger: Internal damage or wear and tear on the turbocharger or supercharger can lead to underboost.

Symptoms of P0299 2016 GMC Sierra

  1. Loss of power: The vehicle may feel sluggish and have difficulty accelerating.
  2. Decreased fuel efficiency: The engine may consume more fuel than usual due to the lack of boost pressure.
  3. Engine misfires: Underboost can cause the engine to misfire, leading to rough idling or hesitation.
  4. Check engine light: The P0299 code will trigger the check engine light to illuminate on the dashboard.

How to Fix P0299 2016 GMC Sierra

  1. Inspect for boost leaks: Check all connections, hoses, and clamps in the intake system for leaks and repair as necessary.
  2. Test wastegate operation: Verify that the wastegate is functioning correctly and replace if faulty.
  3. Replace air filter: Install a new air filter to ensure proper airflow to the turbocharger.
  4. Check turbocharger/supercharger: Inspect the turbocharger or supercharger for any damage or wear and replace if needed.
  5. Clear DTC and test drive: After repairs are completed, clear the DTC and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P0299 2016 GMC Sierra

The cost of repairing a P0299 code in a 2016 GMC Sierra can vary depending on the specific cause of the underboost issue. On average, the cost of parts for this repair can range from $200 to $800, with labor costs adding an additional $100 to $300. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to obtain quotes from local shops for a more accurate estimate.

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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 P0299 2016 GMC Sierra Code

1. What does the OBDII code P0299 mean on a 2016 GMC Sierra?

P0299 indicates that the engine control module (ECM) has detected an underboost condition in the turbocharger or supercharger system, meaning there’s insufficient boost pressure.

2. What are the common symptoms of P0299 in a 2016 GMC Sierra?

Common symptoms include reduced engine power, poor acceleration, black smoke from the exhaust, a check engine light, and potentially hearing a hissing sound from the engine bay.

3. What causes the P0299 code in a 2016 GMC Sierra?

Common causes include a faulty turbocharger, a boost pressure leak, a clogged intercooler, a malfunctioning wastegate, or a damaged boost pressure sensor.

4. Can I drive my 2016 GMC Sierra with a P0299 code?

While the vehicle may still be drivable, continuing to drive with this code can lead to further engine damage or decreased performance. It’s best to address the issue promptly.

5. How do I diagnose the P0299 code in a 2016 GMC Sierra?

Start by inspecting the turbocharger, intercooler, hoses, and connections for leaks or damage. Check the wastegate actuator and test the boost pressure sensor for proper operation.

6. How much does it cost to fix the P0299 code on a 2016 GMC Sierra?

Repair costs vary depending on the cause, ranging from $100 for a simple hose replacement to over $1,000 if the turbocharger needs to be replaced.

7. Can a dirty air filter trigger the P0299 code on a 2016 GMC Sierra?

Yes, a clogged or dirty air filter can restrict airflow to the turbocharger, potentially causing an underboost condition and triggering the P0299 code.

8. What tools are needed to repair a P0299 code on a 2016 GMC Sierra?

Common tools include a diagnostic scanner to read and clear codes, a boost pressure gauge, and basic hand tools to inspect and repair hoses or components.

9. Can a bad wastegate cause the P0299 code on a 2016 GMC Sierra?

Yes, a malfunctioning wastegate can fail to regulate boost pressure properly, leading to an underboost condition and triggering the P0299 code.

10. Will cleaning the turbocharger fix the P0299 code on my 2016 GMC Sierra?

Cleaning the turbocharger may help if the issue is caused by carbon buildup, but a thorough inspection is needed to confirm the root cause before attempting repairs.

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