ABS traction control lights on after rain and puddle

I would disconnect the 12v battery and reconnect it. See if that clears the code out. If that doesn't work, run a code scan and see what it's complaining about. You may have a damaged sensor.

 

I see this often in Subarus (we play in the mud a bit more)

Generally the sensor will dry out on its own, and once the code is reset no further action is required. If you're in a hurry you can dry out the sensor more quickly with a hair dryer or a fast drive on a sunny day depending on what's available.