The 603 was probably set when you unloaded the tuner, or if you unhooked the batteries to install the chip the 603 would be set too. The PO603 did not set the light, and is still most likely nothing to worry about.

The P1211 set the light. It is not too common, but some chipped trucks set the 1211. Most do not. Contact them and see if there is anything they can do about it.

If the truck is running properly then neither code is doing any harm. If it starts bucking and jerking and you have a generally hard time keeping it running then the ICP might be going out, but that would be an odd coincidence given that both codes, while not normal, are not unheard of with chipped rigs.