Rx 350 Ac Air Conditioning Code 23 Pressure Sw?

[indiana]

I get a code 23 when I run the AC diagnostic. I also noticed that the AC pressure is in the bottom of the yellow barely above the blue in the caution yellow area on the gauge. Could this make the AC shut down and not work properly? I get cool air not cold. When I turn the AC off and on I hear the engine idle up and down like normal when you turn the ac on. Are there any suggestions?