When the dishwasher starts to make funny noises or working loudly, it is usually because there are debris caught in the draining pump, although a problem with the motor is also possible.
Drain Pump: The drain pump might needs to be checked for debris. If its clean and noisy it needs to be replaced.
Circulation Pump: Bearings inside the circulation pump will wear out over time and can cause a loud groaning sound while the dishwasher operates.
Wash Impeller: The wash impeller has small plastic blades that help with water flow to the control arms. If one of the blades breaks there could be a noise. It may also be improperly aligned. Inspect for any signs of damage.
Source:
https://www.electrafixbc.ca/appliances/dishwasher.html
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