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Underboost Code at redline

kmarriner

Go Kart Newbie
Location
Tempe, AZ
Car(s)
2019 GTI SE DSG
Earlier this week on Facebook someone posted that they got an underboost code and epc light at redline in a high gear and that it was repeatable for them, basically they were just running through the gears at full throttle and on the 4-5 shift they get the code.


I realized that I had never tried doing that in my new gti, so that night I did the same trial as they did and logged it, getting on it from 3rd at 40 like a normal logging run but continuing all the way through 4th and into 5th. Right at redline in 4th as I was shifting into 5th I got the same code and went into limp mode.

We both drive 2019 GTIs and are tuned using accessports by the same tuner, so I thought maybe it was tune related. So the next night I tried a completely different tune from another tuner and got the code at the top of 3rd this time.


Now I am not good at reading logs and understanding them. Tuner says it could be a boost leak, or a problem with the wastegate or DV.
I definitely have done this before on my previous 2017, and never threw a single code.

Has anyone with a 2019 run into issues with the DV, wastegate, or had a boost leak from the factory? The only mod to my car other than the tune is an intake, but that's pre turbo and shouldn't cause a leak or anything. I still have to look and see if I can find a leak, but I've never done it before so it might be fruitless.

Any other things I should look for?
 
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