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I started the dishwasher this morning and everything is normal. Then all of a sudden it starts to make a relatively loud buzzing sound when the motor runs. It stops when it pumps water in and out. The sound reminds me what it sounds like if someone runs a electric drill in another room, and have a little in common with the buzzing sound of a mobile phone when it lays on table vibrating.

The dishwasher runs through the cycle without any problems except for the buzzing sound. Any idea what this might be? I have a feeling it may be something going bad but it happened all of a sudden and does not effect the dishwasher cycle.

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    You're probably right in your assessment that something is vibrating and that's what causing the buzzing. Most likely a mount point for something has broken allowing a part to move more than it should. It could be as simple as a wire clip that broke and it's allowing a wire to touch something moving, causing the vibration. Of course, if that's the case, the insulation on the wire won't last long and you'll soon have a short which will, at a minimum, stop the dishwasher, and, at worst, cause a fire.
    – FreeMan
    Aug 23 at 15:13
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Dishwashers come with either a washable filter for food particles or a food grinder that reduces food debris to a size small enough to pump out with the waste water. Examples. If you don't have a washable filter, you have a food grinder.

Occasionally, food particles are durable enough that they don't go quickly and quietly, and you'll have a noise like you mentioned for a few cycles, eventually to stop on its own. If you're handy and you don't feel like waiting, you can access the food grinder and clean it out with a toothbrush, wooden skewer or some other tool. See if you can find an video for your model. Remember to turn off power and water to the dishwasher before disassembly.

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The buzzing sound went away just as suddenly as it appeared. A couple of days later in the middle of a cycle the buzz stopped and everything is back to normal. This is a very cheap $350 Frigidaire machine we got after having had super fancy expensive dishwashers that broke after a couple of years. This one has three programs and works just as well or better than those expensive ones. I assumed that it being so cheap was the reason for something to go wrong now, but it looks like this was just a freak incident without an answer to why it happened in the first place.

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