Now it was not on because my tires were low, I have an aftermarket monitor that shows my actual tire pressure. It was on because my spare was stolen out of the bed of my pickup last year, and the light was to let me know one of my TPM were not connected. I picked up a new spare off Craigslist list shortly after mine went missing, but I never got it connected to my trucks monitor, but this morning the light that normally flashes for a minute then goes solid… never came on.