[svxistentialist]

Could be low voltage, your battery would run low after a few weeks.

Does it stay off when you have driven a bit, like when the regulator has charged up the battery? Or will it come back on again at idle?

Get a battery shop to check your battery. If one of the cells was weak, it would continue to not charge properly. If you need a new battery, and the light goes away, that's it fixed.

If it's not the battery, suspect the alternator. You can also do a search here to see how to run engine codes, if something is wrong it would show a code.

Hope this helps,

Joe