Sounds to me like there may be water in the moisture sensor. Your dishwasher is probably leaking and the noise you hear is the drain pump activated.
Even if there is no water in the base pan you should check the water sensor - a float located in the base pan, directly behind the water fill valve. Even if something (mouse, bug, etc.) other than a leak has caused this to move, it can force the control to shut down all operations and run the drain pump continuously.
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