Hello,
Mine 2007 LBZ. It gets a 2563 code also. Took it to a diesel shop. Cleared the code. They say it could be the sensor, vane or turbo. Going with the cheapest they would change the sensor since its unlikely a turbo problem. The problem code came back few weeks later without changing anything. Then it goes away after about 4 cycles of starting the engine. Been doing that for about 4 times now. Waiting to see it stay on, then taking it to the shop. I see no change in power or MPG. My mileage is 54K. PM me if you find the fix. Thanks