My guess would be that the monitors nedd to be reset. This has to be done by the dealer. It only takes about 5-10 minutes. They hook up the computer console and go around to each wheel/sensor with a magnet. The system "reads" each sensor and resets the onboard computer.

I have to have mine reset when I change over from my summer to winter tires.

If that does not fix it, it may be a bad sensor.

In either case, it is time for a call to your dealer.

Hope this helps.