Could be from something stupid that happened when you started it. Disconnect battery to get rid of light and if it comes back on, get a reader to get codes. I had my light come on on the way home 2 years ago and all was well on my instruments. Drove it all the way home, did the battery thing and light has not come on since. I have gone south again since. Also happened the other day with my Ford pickup, disconnected, light went out and has not come on again.
Steve and Sheri with Archie (and Hiro, R.I.P.)
2000 Winnebago 35U, Ford F53/6.8l V10
F150 Ford and Vintage Aspencade.