chevy impala check engine light reading P0480 error code?

i have a 03 impala and the check engine light is on. the car is running fine and is not overheating, the a/c and heating system are both working okay. i had the cooling fan 1 relay switch replaced in August and the check engine went out for a tiny bit and came back on after my road trip. i took the car to autozone and its reading the same error. is it possible that i need to replace the the relay switch again? i plan on taking it to shop and wanted to know if anyone had this sort of problem before and know roughly how much a mechanic would charge for this sort of thing. the autozone print out also read "cooling fan 1 relay" and "check connector and wiring". please help all advice is greatly appreciated. thanks!