These warnings came on while driving or when you first started the car, then slowly went away? If you disconnect the 12 volt battery many dash lights will illuminate. This is actually discussed in the Clarity Owners Manual on page 509 for the 12 volt battery maintenance. If this is the case, then I would, like above, recommend checking the battery. Keep in mind that the 12 volt battery may actually be fine (with your vehicle age I would be surprised if it was failing) but you have a loose terminal connection. Unlike regular cars that have high current draw starter motors to start the ICE (some drawing several hundred amps for a few seconds) it takes very little current to close the HV battery contactors or run accessories. So, where a loose battery connection will show up on a regular car as the lights working but the starter not (clicking etc) for the Clarity you get electrical gremlins. Try checking the battery posts for fit and clean or tighten them. If that isn't it then have the battery tested, if that isn't it - well, let all of us know what the dealer says?!? Also, from personal experience, you do have to perform the below procedure to really clear these errors if caused by the 12 volt electrical system.
From the Manual:
The indicators for the Vehicle Stability Assist (VSA®)
system, VSA® OFF, Collision Mitigation Braking
SystemTM (CMBSTM), and low tire pressure/Tire
Pressure Monitoring System (TPMS) may come on
along with a message in the driver information
interface when you turn the power system on after
reconnecting the battery.
Drive a short distance at 12 mph (20 km/h). The
indicator should go off. If it does not, have your
vehicle checked by an authorized Honda Clarity Plug-
In Hybrid dealer.
Note: Then drive at 88 MPH to clear the Flux Capacitor and regain those long streaks of fire behind your tires... sorry, couldn't help it - on a kick lately...
Cheers,
Cash