No, the P0480 is unrelated to the other two. You're thinking of the throttle system, which is on the same 5V reference line as the fan.
For the cam codes, check the CPAS for oil in the connector and replace if it's defective. Sometimes it can be just dirty with junk on the screens but at this point it might be worth it to just put a new one since you have to remove the power steering pump. Clear the codes and recheck.
For the P0480, try swapping the fan relay (aka: module) with the one for the headlights. If the headlights still work and the fan code returns after clearing, check the wiring at the clutch as it is notorious for breaking.
Hi all GMTNation. .I have a 03 gmc envoy 4.2 and I am getting a P1481 error code which is to due with the clutch fan speed sensor circuit malfunction. I had replaced my clutch fan a few years ago and everything was fine until recently I got this P1481 code but my clutch fan is still operating...
gmtnation.com
The ultimate fix would be to swap the clutch out to a thermal type as per that thread.