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First, I would check the selector switch under the driver's side dash and ensure that is is on the Main setting. If the TPMS light is flashing, it usually means a battery in one of the sensors has died. To diagnose, you can take it to a tire shop, or use Techstream to see the sensor temperature and pressure for all 5 sensors.
Yes, check the TPMS selection switch, then check the pressures (go by the door sticker, +/- 2psi). Don't forget to check the spare!!
If you add/remove air, drive the vehicle for 10 miles or so to see if the light still stays on. If it's still on, probably a dead battery in one of the sensors.
Refer to the TPIS Diagnostic Flowchart attached. Only if the TPIS has lost comms with ECU then you need to goto the dealer to have this sorted thru the techstream.