Couldn't Code P1811 also mean trans fluid low? on 2006 Chevrolet Impala

There was a big storm and I ran over trees, went through creeks where bottom of car was dragging. That's why I wondered if maybe a line of some sort cracked or could be leaking. Just seems odd that I didn't have any leaks until right after this happened. I feel like they just said this code means you need pressure control solenoid & it'll cost you over $700 instead of offering other possibilities.

Asked by for the 2006 Chevrolet Impala