Im getting a p1810 trans fluid pressure valve fault code. 4l60e in a LS1 swap. Trans shifts great, doesn't slip and is super smooth. What symptoms could I see if the trans fluid pressure valve was bad?

 

You could try replacing you manifold pressure switch. If you drop your pan it is pretty easy to change.

It will be bolted to the bottom of the valve body. Here is a picture of the side you will see. Just undo harness, remove bolts, then reverse order.