Another day, another overboost code. Dealer has been no help


New member
Grand Cayman
2008 3DR Golf GTI
Hello fellow MkVers.

Well my GTI is overboosting again. P0234 code thrown along with limp mode if i gently accelerate to 3000RPM.

However if I accelerate hard I get through the rev range. I do however notice either a blowing/sucking noise that kind of sounds like a vacuum that dissappears around 3000RPM and to me it feels like I then suddenly have more power. So to me this seems like a boost leak that falls away the more I accelerate? I dont know anymore.

Had the intake manifold cleaned by the dealer, MAP sensor and diverter valve is brand new. Unfortunately I don't have VAG com or VCDS yet to log runs. All I know is that with each run I can simulate/avoid the overboost code. Gentle acceleration=limp mode at 3k. WOT=Blowing/sucking noise till 3k then feeling of more power.

I apologize if I missed anything or if I'm asking a question that cannot be answered without proper logs but when the dealership is giving up I don't know what to do either! Thanks for any help/input