AutoCodes – Buick – P0299 Buick

P0299 Buick 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 Buick 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.

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Code Popularity 32,313

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 09, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0299 Buick Description

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. The ECM calculates a desired boost pressure value and monitors the actual boost pressure. If the difference between the actual boost pressure and the desired boost pressure is less than or greater than a calibrated threshold level, the ECM detects that the amount of detected boost pressure is out of range. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the difference between the actual boost pressure and the desired boost pressure in the intake manifold is less than the expected range for 12.5 s. The 12.5 s time is not continuous but cumulative. The timer may sum up a heavy load condition obtained during different maneuvers.

OBDII Code P0299 Buick - Engine Underboost - AutoCodes.com — P0299 Buick Code - Engine Underboost

What does this mean?

What are the Possible Causes of the DTC P0299 Buick?

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 Buick?

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 does this mean?

Code Tech Notes

There is a factory service bulletin for the following Buick models:
Buick Encore 2013-2019
2013-2019 Buick Encore Factory Service Bulletin OBDII Code P0299

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0299 Buick 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 Buick code?

Need more information on how to fix the P0299 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 Buick Code

1. What are the common symptoms of OBDII code P0299 in a Buick?

- Common symptoms include reduced engine power, poor acceleration, and the activation of the Check Engine light.

2. What are the possible causes of OBDII code P0299 in a Buick?

- Possible causes include a faulty turbocharger/supercharger, wastegate issues, boost pressure sensor problems, or air intake leaks.

3. How can I diagnose the cause of OBDII code P0299 in my Buick?

- A diagnostic scan tool can help pinpoint the exact issue by checking live data, monitoring boost pressure, and conducting a visual inspection of related components.

4. Can driving with OBDII code P0299 damage my Buick's engine?

- Continuing to drive with this code may lead to further damage due to the engine running at reduced power levels. It is best to address the issue promptly.

5. How can I repair OBDII code P0299 in my Buick?

- Repair options may include replacing a faulty turbocharger, fixing wastegate issues, replacing the boost pressure sensor, or repairing any air intake leaks.

6. Is it safe to continue driving my Buick with OBDII code P0299 if the symptoms are not severe?

- It is not recommended to drive with this code present, as it can lead to further damage and potential engine issues over time.

7. Are there any maintenance tips to prevent OBDII code P0299 in a Buick?

- Regularly servicing and inspecting the turbocharger/supercharger system, checking for boost leaks, and using high-quality fuel can help prevent this code from occurring.

8. Can a DIY enthusiast repair OBDII code P0299 in a Buick, or should it be done by a professional?

- While some repairs can be done by a skilled DIY enthusiast, diagnosing and repairing issues related to OBDII code P0299 may require the expertise of a professional mechanic.

9. How long does it typically take to repair OBDII code P0299 in a Buick?

- The repair time can vary depending on the exact cause of the code and the availability of parts. It may take a few hours to a full day to complete the repair.

10. Will resetting the Check Engine light resolve OBDII code P0299 in a Buick?

- Resetting the light may temporarily turn it off, but if the underlying issue causing the code is not addressed, the light is likely to come back on. It's essential to diagnose and repair the problem to prevent future occurrences.