Sounds like the worm gear in the motor may have come disengaged. You can pull the seat and check it out if you like. Just be sure to disconnect the negative terminal on your battery first, wait a bit, then dig into the removal.
Four bolts and an interesting plug to learn how to disengage. It has a flip lock thingy. You'll see.
If the motor needs replacing, I have a few spares lying around from a seat I tore down.
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