A few things to start with...

Not in transport mode is it?
Check your classification resistor and transfer case motor.
Ride height sensors not flipped over?

Congrats on the 4.8iS and don't forget to add yours to the 4.8iS section by ViN

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course