You must have hit a very big pothole VERY hard... Start as T-hawk says. You've got an electrical issue somewhere as evident by the random systems cutting out. The wiring harness wouldn't have seen enough shock to damage the actual wiring or plugs, however the fuse-boxes may have.
Maybe the fuse box got roughed up...
When I turned my car on to shift into neutral this past weekend (with the engine out), all sorts of messages came up because of all of the unplugged cables, including "Contact your dealer"
In short, you computer thinks there is something very wrong, and you really need to find where the problem is in that electrical system. It could be a serious danger to drive with such malfunctions.
'09 PSM G8 GT - OPG Intake, DOD-Delete w/ Stage 1C 218/229 .600 Lift 117.5LSA, Kooks 1 7/8 Mids, Solo Axle-Back w/ X-Pipe, SuperPro Bushings (Front and Rear). BMR Sway Bars (Red)
"If you want to criticize someone else's work, be sure that your own is in order first."