I had something weird happen with my 2018 Clarity's TPMS recently. I've been bad: haven't personally checked the tire pressure since I bought the car a year ago (but it was serviced 2 months ago at the dealer, and it also went in for a stone jammed in the wheel, so they would have checked then too, I assume). Like many women, I wait for the TPMS to tell me there is an issue before doing this.
So I was cruzing on the highway, and after about 40 mins of driving, the TMPS warning light went on. I stopped at a garage to get air, but the gage on the air-machine said the tires were well over 40 psi (door says 36 is needed). I was baffled; was their air gage wrong, or what? So I stopped at a Honda dealer and asked them to check the inflation of the tires, and they confirmed the pressure was *too high (around 44 psi)*, and corrected it. Since the only people who had ever put air in my tires were the Open Road Honda folks, this really got me concerned. So, I guess, if there is some sort of auto-calibrate, then I should speak to the dealer about this issue? Why were my tires so (dangerously?) over-inflated?