P0299 - How To Repair: Meaning, Causes, Symptoms, Fixes

P0299 - OBD2 Trouble Code Turbocharger/Supercharger Underboost Condition

Identical faults

The following faults are identical to P0299. For these, you can follow the information on this page:

P0234 – Turbocharger/Supercharger Overboost Condition

P0299 Code Definition

Turbocharger/Supercharger Underboost

What Does the Engine Code P0299 Mean?

Character "P" in the first position of Diagnostic Trouble Code (DTC) represents the powertrain system (engine and transmission), "0" in the second position means that this is a generic OBD-II (OBD2) DTC. "2" in the third character position in a DTC indicates that the fuel and air metering and auxiliary emission controls is experiencing a malfunction. The last two characters "99" is DTC number. OBD2 Diagnostic Trouble Code P0299 means that Turbocharger/Supercharger Underboost Condition has been detected.


    Carly Universal Scanner

    Carly Adapter
      iOS and Android enabled
      All car brands supported
      14-day money-back guarantee on the scanner
      Lifetime warranty with premium customer support
    Buy now

    What Is the Cause of P0299?

    There can be several damages/failures causing the underlying problem of the OBD2 DTC P0299. To find the root cause of P0299, unlock the “Smart Mechanic" feature in the Carly app.

    What Are the Symptoms of the Code P0299?

    Symptoms of faulty boost pressure control

      Illumination of the engine control lamp (MIL)

      Reduced engine power

      Poor throttle response

      Increased fuel consumption

    Diagnostic background image

    How much does it cost to diagnose P0299?

    Visiting a car repair shop and letting them perform a diagnostics check can cost you $60-$100. For almost the same price you can get Carly. Its advanced features can cover what a professional automotive scanner that costs over $3,000 would, and more!

    Carly OBD2 Scanner

    How To Diagnose and Clear the Code P0299?

    Performing a diagnostics check with a diagnostic scanner helps you identify a particular problem area that is outside the normal range and shows where a fault might be occurring. This helps you to detect errors before they cause more damage to your vehicle. In comparison to generic OBD devices that only provide OBD-level engine-related data, Carly can run advanced manufacturer-level diagnostics, check all your ECUs in your car (like ABS, airbag, multimedia) and get deeper insights. You can find additional information about the trouble code and understand the severity of the problem. With the new Smart Mechanic feature, you get additional professional insights and tips from expert mechanics. You are able to check components and their mechanics, find detailed repair tips, and learn about potential future damage. After you have fixed the problem you can easily clear the fault codes with Carly, too. Also, the diagnostic results are safely stored inside the app or as convenient PDF reports you can share with your friends or a mechanic.

    Common Mistakes when diagnosing the P0299 code

    The most common mistake is to look and try to fix each individual OBD2 (OBD-II) code without having a holistic understanding and approach. Understanding the interrelationship of different systems is crucial to determining the root cause of the problem and finding the right solution. The new Carly Smart Mechanic feature provides a look at the whole system, not just one individual code. Enable Smart Mechanic in your Carly app and get a holistic solution-focused approach when diagnosing the code P0299.

    How Serious Is the Code P0299?

    This issue is not critical yet. Make sure that it is current and fix it early before this leads to more severe issues.

    How to fix the P0299 Code

    P0299 is a generic fault code but the repair steps may vary depending on the root cause and the make/model of your vehicle. Get the Smart Mechanic in your Carly app to learn more and receive guidance.

    Blurry background image
    Mobile and adapter showcase

    Estimated Cost of Repair for the P0299 Code

    The cost very much depends on the root cause of the issue. To find more information about causes, possible solutions, and potential repair costs, unlock “Smart Mechanic" content on the Carly app.

    Get Carly Now

    Learn more about the P0299 Code

    How the turbocharger/boost pressure control works

    The turbocharger has the task of compressing the combustion air supplied to the engine. Compared with naturally aspirated engines, this results in significantly better filling of the cylinders. The result is an increased engine output combined with lower consumption and better emission values. Exhaust gas turbocharging uses the energy of the exhaust gas to drive a turbine. This would otherwise escape unused into the surrounding air. A compressor is mounted on the turbocharger shaft opposite the turbine. This draws in the combustion air and feeds it to the engine in compressed condition. There is no direct mechanical coupling with the engine. The boost pressure control ensures that the correct boost pressure is set at all times. Depending on the operating situation, the boost pressure is controlled or regulated. In controlled mode, the boost pressure regulator is controlled using a predefined map/duty cycle, depending on the operating situation. In closed-loop operation, the actual boost pressure is measured by the boost pressure sensor. The engine control unit uses this to calculate the duty cycle required to achieve the specified target boost pressure. Usually, a turbocharger with variable turbine geometry without wastegate valve is used for boost pressure control.

    *Every car is unique. The Carly Features that your car supports depend on the model, build year, hardware, and software in the car. Plug the scanner in the OBD2 port, connect to the app, run your first diagnostics, and check which features are available for your car. Also, keep in mind that any information provided on this website is for informational purposes only and should be used at your own risk. Mycarly.com is not responsible for any errors or omissions, or for the results stemming from the use of this information.

    Code list background

    Top 10: The most common OBD2 trouble codes

    Car Brands
    • BMW
    • Mini
    • Volkswagen
    • Audi
    • Seat
    • Skoda
    • Mercedes
    • Porsche
    • Renault
    • Toyota
    • Lexus
    • Ford

    Our Partners

    Inside of EU
    Outside of EU(priority shipping)

    Our payment methods

    (Depends on your country)

    Our advantages

    • Secure payment
    • Lifetime warranty on the Carly Scanner
    © 2023 Carly Solutions GmbH & Co. KG. All rights reserved