Causes and Fixes P0299 Code Chevy Cruze

By | June 3, 2022

Causes and Fixes P0299 Code Chevy Cruze Underboost
If you have a Chevy Cruze with a P0299 code, there is an issue with low pressure from the turbo.

The official definition of a P0299 code is “Turbo/Super Charger Underboost.”

What is a Chevy Cruze P0299 Code?

Causes and Fixes P0299 Code Chevy Cruze
A Chevy Cruze P0299 code happens when the onboard computer (ECM) sees low pressure in the manifold.

It is an underboost code the ECM sends out when it detects an underboost condition exists.

The boost is the amount of positive pressure that is being created by the turbocharger.

When the pressure is low, an underboost condition will exist, which the ECU will receive through sensors and send out a P0299 code.

The ECU calculates the parameters with data from the mass airflow sensor, ambient temperature, engine load, RPM, and fuel injector duty cycle.

The manifold absolute pressure sensors measure how much boost there is.

An ECU will consider variations but has a threshold pressure needed or will send out a P0299 code.

Causes and Fixes P0299 Code Chevy Cruze

  • Turbocharger
  • Chevy Cruze Turbocharger
    If the turbocharger has a malfunction is can cause the error.

    Two common failures in a turbocharger are the Wastegate arm and housing.

    If the Wastegate arm is worn out and starts to stick, it will not close and seal, causing a problem.

    The Wastegate actuator has a rod that opens and shuts the Wastegate arm and can also cause an issue.
    Checvy Cruze wastegate actuator

    The ECM operates the actuator arm, which can cause a problem if not working or is stuck.
    Causes and Fixes P0299 Code Chevy Cruze 3

    If the Wastegate housing has a crack, it can also cause an issue.
    Causes and Fixes P0299 Code Chevy Cruze 2
    A housing can sometimes look cracked but be good, so be sure to test it properly.

    A crack will cause the turbo, which should be building pressure, to leak, which will lead to low pressure.

    Low pressure can lead the ECM to send a P0299 OBDII error code.

  • Boost Pressure Leak
  • Causes and Fixes P0299 Code Chevy Cruze Maniold
    A boost pressure leak between the turbocharger and the cylinder head will cause a P0299 Code.

    The leak can be on the intake manifold gasket, charge pipe to the intercooler, and charge pipe to the throttle body.

  • Intake Manifold Check Valve Failure
  • If the intake manifold check valve goes bad or has a leak, it can cause issues.

    Examine the large PCV pipe at the back of the turbo inlet for a leak.

    When a Chevy Cruze has a P0299 error code, there is a problem with the pressure created by the turbo.

    While most mechanics will swap out the turbo with a new unit, the problem can also be elsewhere.

    Before swapping out a turbo, be sure there is no intake manifold leak or any place the pressure can be lost.

    Replacing the turbo is a straightforward task done by many DIY mechanics but of course, if in doubt, take your car to a professional.

    Have you had a problem with a Chevy Cruze and a P0299 Code? Let us know your thoughts below.

    2 thoughts on “Causes and Fixes P0299 Code Chevy Cruze

    1. Ryan

      Hello, my daughter has a 2012 Cruze that has the p0299 code on it. We’ve replaced the turbo 3 times now and the check engine light remains and the car seems under power. Looking for help on what to do next.

      1. Maxim Teleguz

        Was the turbo new each time? Because you may bought a turbo that was used with the same problem.


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