2010 dodge grand caravan. Trouble code B2394. What does it mean?

Get the codes read again. Write the number down. The B2394 is not a valid code. P2394 is not valid either.

" aha got the number,! im outta here, thats all I need",the gurus will complete this in an honest way!

The code was printed out from the machine. It says B2394. What it says next ti it is this. " Flash to pass/ Optical horn swith circuit stuck. The reason I took it to the is because the engine light was staying on. The code from that was P0456. I know thats for a vaccum leak. It gave that code before and the did a smoke test and said they found the leak and fixed it. Now it gives the same code and they told me the leak is on top of the gas tank from one of the lines. How could that happen on a vehicle that's only 3 years old. It's out of warranty also but I do still have the powertrain warranty.

po456 is a small leak in the evap as you know,3 yr old their test show a leak? remember if a car is doing its purge epa bullsh-t while you fill the tank,it,ll grab a leak code also, or small vent hose a fill tube can slip off, and mostley its the cap

gas cap probably has some dirt .give it a wipe put a little vaseline on gasket and try ,