I have the same issue...here is the deal.
I have two keys.
A grey Valet Key - runs ignition and door locks only (a bit thicker so it doesn't fit in the locks for the glove box or trunk)
A black Key - fits and unlocks everything.
However, the chip in the black key was wiped so it does not turn the ignition due to the immobilizer that NOFX mentioned.
The dealership wanted $125 to activate the key.
Instead, I carry both.