Yes you'll have to get it scanned to see what the problem is. But my money would be on a turbo overboosting. They can get damaged or clogged and then overboost and it puts the engine into limpmode as a protection
Yeah most likely overboosting. The VAG tdi's are prone to it, including my Golf. I tried many things, in the end it was a dodgy N75 valve..solved the problem straight away. A new valve from VW was about £60, disconnect the old...click in the new and job done, very easy.
I have the old Tdi mk4 golf engine though, the n75 was making a noise and covered in oil for some reason, should have replaced that first but you live and learn.
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