Lukewarm_A5

Hello all, I'm new to Audi's and have done a scan on my car which has appeared to have thrown up two fault codes under Air Conditioning, the aircon doesn't appear to blow cold either, any help towards what the cause of this may be would be greatly appreciated! The codes are as follows: 00457 - Control module for network (J519) U0001 - CAN bus drive Thanks in advanced everyone!