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No part of your dishwasher is more likely to responsible for strange odors than the drain filter. Food particles can collect here, and over time in a warm, moist environment they can become disgusting. There will probably be a cylindrical, detachable filter through which all of the water drains.
I can understand how easy it would be to toss one in the dishwasher. Unless the pod did not fully dissolve, the smell can be dealt with over time. I see you have tried all the normal suggestions. First, make sure there is no trace of the pod in the dishwasher filter. Vinegar is always a good choice to sanitize and remove odors. Since that did not do the trick, I recommend using a product called Affresh to help rid the dishwasher of the remaining odor. Just follow the instruction on the package.