jroptop

Ok, so I have been chasing these codes for a few weeks now, and after extensive research, I cant find anything relative to these codes found on my 2010 528xi. The famous 9cc5 RLS no response, but my RLS seems to work fine in response to rain etc...then the PITA 9C5D 21. I am able to clear them using Inpa or Carly, but then they return after a day or so. Anyone have any ideas or experiences with these codes? I cleaned the electrical contacts at my pressure sensor switch on the ac line, but still get the error. AC works fine with no issues, and low pressure side is in within range with outside temps. Any help is much appreciated! Thanks in advance!