One or more batteries in the TPMS monitors is likely out. The batteries typically last 5-10 years. Unfortunately, it means about a $30-$50 monitor plus a tire shop's installation charge. Are your tires' actual PSI pressures showing on your display as you go through the menu?

 

Thanks for the reply. I also figured it was probably a dead battery on one of the monitors because of the age of the car. I figure in a year or so I will need another set of tires. That's when I will have them service and/or replace whatever is necessary for the TPMS. I am pretty anal about checking the tire pressure on my vehicles so I can make it without the TPMS until then.
I'm not concerned about the cost of the repair. I just don't like people messing with my car if I don't think it is needed. I went through the manual twice and couldn't find any mention of a fuse for the TPMS.

 

Before you waste money, find a TPMS tool that will scan sensors. Yes, they all pair sensors with the car. Good ones also read the sensor itself and wake it up and will tell you the status. I use an Autel 401 for this, but there are newer versions. Very handy for trouble shooting, and great when checking out used wheels and tires to check if sensors work and if they are the correct match for the car you want to use them on.