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P0299 2017 GMC Sierra Code - Engine Underboost

Quick Answer

The P0299 code on a 2017 GMC Sierra indicates that the engine is underboosting, meaning that the turbocharger or supercharger is not providing the expected amount of boost pressure to the engine. Common causes include Faulty turbocharger or supercharger, Vacuum leaks in the intake system, Wastegate malfunction. 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 or supercharger, Vacuum leaks in the intake system, Wastegate malfunction.
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 17, 2024
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Code P0299 2017 GMC Sierra Description

The P0299 code on a 2017 GMC Sierra indicates that the engine is underboosting, 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 not addressed promptly. The turbocharger or supercharger is responsible for compressing air and delivering it to the engine to increase power output. When the engine is underboosting, it can result in a lack of power, slower acceleration, and overall poor performance.

OBDII Code P0299 2017 GMC Sierra - Engine Underboost
P0299 2017 GMC Sierra Code - Engine Underboost

Common Causes of P0299 2017 GMC Sierra

  1. Faulty turbocharger or supercharger
  2. Vacuum leaks in the intake system
  3. Wastegate malfunction
  4. Boost pressure sensor failure
  5. Clogged air filter restricting airflow

Symptoms of P0299 2017 GMC Sierra

  1. Loss of power or acceleration
  2. Engine hesitation or surging
  3. Decreased fuel efficiency
  4. Illuminated check engine light
  5. Rough idling or stalling

How to Fix P0299 2017 GMC Sierra

  1. Diagnose the issue by checking for vacuum leaks, inspecting the turbocharger/supercharger system, and testing the boost pressure sensor.
  2. Replace any faulty components such as the turbocharger, wastegate, or boost pressure sensor.
  3. Clear the diagnostic trouble codes and reset the engine control module.
  4. Test drive the vehicle to ensure that the issue has been resolved and that the engine is producing the correct amount of boost pressure.
  5. Perform a final inspection to verify that all repairs were successful and that the check engine light has been extinguished.

Cost to Fix P0299 2017 GMC Sierra

The cost of repairing an engine underboost issue can vary depending on the specific cause of the problem and the extent of the repairs needed. In general, the cost of replacing a turbocharger or supercharger can range from $1000 to $3000, including parts and labor. Additional costs may be incurred for replacing other components such as the boost pressure sensor or wastegate. It's important to note that labor rates at auto repair shops can vary, so it's advisable to obtain a detailed estimate from a qualified technician based on the specific circumstances of your vehicle.

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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 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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