It is possible your pump is burning out, meaning the barrings in it are waring, and that is why your hearing noise and of course it is a water pump, so if is not working or pumping and just running, it will make noise do to the fact is water is not running though it. Fist here is something to try, before you decide to replace the pump.
First check the drain hose that it has not gotten pinched anywhere. Then check it to see if it may be plugged with dirt and debris
. If you have it hooked to a garbage disposal make sure that the hole into the garbage disposal is open.
If all of that checks out, then check the screen inside at the bottom of the dishwasher. Excessive food
buildup will block the flow of the water into the pump.
that is clear then you may need to remove the bottom rack, and the
bottom spray arm. This will allow access into the pump. Some dishwashers
have a diverter flap that opens to allow the water into the bottom
impeller, which is the pump out impeller. Also check that the bottom
impeller is in good shape and not deformed. The switch that operates the
diverter flap can also go bad. You need to check that it can operate
and that is does if power is applied to it. Thanks Mike