I don't have anything on the C2227 code.
A quick check you can do is inspect the inside of your tailpipe for soot. That would indicate that DPF is cracked, allowing soot to blow through.
It will have something to do with the emissions system, possibly being clogged/cracked. I've had both P049B-00 and P0299-00 along with a couple others, and it ended up being a cracked DPF. Truck kept going into limp mode. Dealer replaced it and has been fine since.
The C121C-00 code is your...
5 year warranty and unlimited miles. If you can, wait until that warranty is close to expiring and then take it in. Get it fixed all at once because its bound to happen in other areas of the Jeep.