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P0299 underboost code?

Tiny
CSBENNETT205
  • MEMBER
  • 2017 CHEVROLET CRUZE
  • 1.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 136,000 MILES
My code has been on for a few months now I drive the car everyday.

When I clear the code it will stay gone until I accelerate past 60mph then the code with come on. I can clear it and then do the same thing and the code will be back on.

Could it be my wastegate actuator? Any sensors?
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Tuesday, August 20th, 2024 AT 12:52 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

As far as the code, it indicates an under boost. Yes, it could be related to the waste gage and a few other things. For example, a faulty bypass solenoid, wastegate actuator, and so on can be the problem. It could be something as simple as a loose connection on the intake duct, a leak between the turbo and the throttle body, or something restricting air flow. Have you checked to make sure there are no leaks in the charge air tube or anywhere in the turbo system?

What I suggest is this. Because different things can be the cause, we need to do some diagnosing. If you look below, I attached the diagnostics specific to the code. Take a look through them and let me know if you are comfortable performing them. Note, based on some of the testing, I may need to get additional information for you. However, I won't know which way to go until certain tests are completed.

Take a look and let me know if you feel comfortable performing them.

Take care,

Joe

See pics below.
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Tuesday, August 20th, 2024 AT 6:27 PM
Tiny
CSBENNETT205
  • MEMBER
  • 3 POSTS
All I have is a obd2 sensor so I can’t control anything hardly. I can clear the code though. I can’t go to a history or anything.

Is there anything else that I could go to check these sensors that it is telling me to to check?

My charge cooler is dented around the bottom could that need to be replaced? It’s not leaking or anything though.

I opened up my turbo and my waste gate is doing what it’s supposed to and there’s no hairline cracks or anything around the holes.

The turbine spins just fine not too free but doesn’t take force to spin it.

Is there a way I could check for air leaks? What’s the best way and what’s the best way to clean the turbo?
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Friday, August 23rd, 2024 AT 3:13 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

As far as testing, without a scan tool, you will need to locate the different sensors and have to manually test them. Is this the only code that is present?

Joe
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Saturday, August 24th, 2024 AT 7:15 PM

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