Yep, that’s the dreaded P2885 code. Boost pressure deviation. There’s a few things that can cause this. Boost leak, bad diverter valve, turbo wastegate, and so on. Probably the first thing to do is check all of your charge pipes to be sure your not leaking somewhere. If that looks ok, check your diverter. Those are 2 fairly straight forward and not too hard to do things to check. It’s hopefully just your diverter, as they do fail eventually. The plastic bits inside can deteriorate and break. Pull it off the car and inspect it.
Also, it would help to know the exact condition that send it into limp mode or pops the code. For instance: does it happen on the highway, or under load, on a hill, speed, what you were doing at the time, etc this kind of info can really help sometimes. Like when I needed to replace my turbo, the symptoms were very specific under very specific circumstances when it would trip a code.