Code P2544 help...2010 CX-7

Ok I'm new here and got a problem...

P2544 code came on and the car 2010 cx7 is very slow, it will only go about 60 mph and it takes a while to get there. The front got hit, some head light wires are banged up and the car started to push out white exhaust. What is the code and how to fix it?

What do I do..?