http://wiki.ross-tech.com/wiki/index.php/18695/P2263/008803
18695/P2263/008803 - Turbo/Super Charger Boost System: Performance Malfunction Indicator Light (MIL) ON
Possible Causes
Hoses incorrect connected, disconnected, blocked or leaking
Solenoid Valve for Boost Pressure Control (N75) defective
Possible Solutions
Check Hoses
Check Solenoid Valve for Boost Pressure Control (N75)
Check Cam Adjusters as per Repair Manual
Special Notes
On some engines, TPI 2016970 may apply. Boost Pressure Control (N75) part number 06F-906-283-D can cause P2263 and/or P0234.