My 08 just got the P2563 code @ 44,000 miles. Never had any emissions messages or any indication of problem until the MIL. My truck was built 8/2007. The first fix is to clean the turbo, dealer did the cleaning and road tested and the code popped up again. The turbo was replaced, 2 new O2 sensors (had old style), and the EGR system cleaned. No more code. Your neighbor probably needs to replace the turbo, cleaning might fix for a short time but tech said not really a permanent fix. Several trucks have had issues again in a few thousand miles and turbos replaced never come back. Was lucky mine was a warranty repair.