Check Engine Light Code P0299 | O'Reilly Auto Parts

Diagnostic trouble code P0299 refers to “Turbocharger or Supercharger Underboost Condition”. If you’re experiencing this code on your vehicle, it generally means that your engine computer and related sensors have determined that the turbocharger or supercharger on your engine is not delivering adequate boost pressure, or that the amount of boost pressure detected is below the specified range for normal operation. A P0299 code can also present with several symptoms related to performance and efficiency, and several parts of the vehicle may be responsible for this code.

Issues related to a P0299 code can often include:

Turbo/Supercharger
Turbo/Supercharger Solenoid
Boost pressure sensor
EGR (exhaust gas recirculation) system
MAP (manifold absolute pressure) sensor
Control module
Wiring
Intake Leak/Restriction
Exhaust leak

The necessary parts and tools to clear this Diagnostic Trouble Code (DTC) might differ depending on your vehicle's make and model. If your Check Engine light is illuminated, stop by any O’Reilly Auto Parts and get an O’Reilly VeriScan® for your car, truck, or SUV and get a detailed VeriScan report with more information about your vehicle’s Diagnostic Trouble Code(s), along with possible causes and repair solutions. If you aren’t comfortable making these repairs yourself, our parts professionals can recommend a local shop to make your repair.

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OBD-II fault code P0299 means “Turbocharger or Supercharger Underboost Condition”. This means that your engine control module has detected that your turbocharger or supercharger is delivering too little boost pressure.

P0299 Code Diagnosis

When you experience a P0299 diagnostic trouble code, your vehicle may be experiencing failure in one of a few areas:

Turbo/Supercharger
Turbo/Supercharger Solenoid
Egr (Exhaust Gas Recirculation) System
Map (Manifold Absolute Pressure) Sensor
Control Module
Wiring
Intake Leak/Restriction
Exhaust Leak

P0299 OBD-II Code Symptoms

Aside from a Check Engine light, you may notice performance problems, reduced fuel economy, and unusual sounds.

Additional symptoms of a P0299 Code can include:

Check Engine light
Decrease in power
Reduced boost
Decrease in fuel economy
Turbo or supercharger noise

Even though your vehicle will still run and you may not even notice any symptoms, it’s important to have this code diagnosed as soon as possible to avoid more serious issues down the road.

What does DTC mean?

DTCs, or Diagnostic Trouble Codes, are generated by data collected by your vehicle’s onboard diagnostics system, or OBD system, and trigger your Check Engine light by identifying problems with one or more of your vehicle systems. DTC codes help explain what the issue is and where it is located.

Learn more about DTC codes

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What are the most common DTCs?

Some of the most common DTCs include:

P0300-Random or Multiple Cylinder Misfire Code
P0301 through P0308- Single-Cylinder Misfire Codes
P0446- Evaporative Emissions Control System Codes
P0455- Evaporative Emissions Control System Codes-Leaks
P0420 or P0430- Catalyst Efficiency Codes
P0141- Oxygen (O2) Sensor Codes
P0171 or P0174- Lean Code
C0221- Wheel Speed Sensor

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Can I clear DTCs?

To clear DTCs, you can use an OBD-II code reader to scan and clear the codes. However, this will only temporarily turn off your Check Engine light. If the problem is bigger than a code or sensor reset, the Check Engine light will likely reactivate.

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If your Check Engine light is on, stop by any O’Reilly Auto Parts location where our Parts Professionals can scan and diagnose your illuminated Check Engine light for free with our exclusive O’Reilly VeriScan code reading service. An O’Reilly VeriScan provides a detailed report of possible causes and solutions or repairs for your illuminated Check Engine light. The O'Reilly VeriScan report, along with the O’Reilly Auto Parts How-To resources can help you understand what parts, tools, and services you need to clear your DTCs and Check Engine lights. If you aren’t comfortable performing any necessary repairs yourself, we are also happy to recommend a local repair shop.