What P2563 usually means
P2563 focuses on turbo actuator position feedback rather than boost pressure alone. On systems with electronic actuators or position-monitored control hardware, the ECU wants the turbo control mechanism to move where commanded and report that movement honestly. When it does not, the engine can end up with either underboost or overboost behavior, which is why this code is valuable: it often points straight at the control side before the pressure codes fully explain the problem.