Dishwasher drain pump. If the dishwasher does not drain then the drain hose could be clogged or the drain pump damaged or defective.
Dishwasher water inlet valve assembly. The water inlet valve supplies water to the dishwasher. If the water inlet valve is defective, the dishwasher may not fill or may underfill.
Dishwasher circulation pump motor with wash impeller. Poor washing and noise during operation are indications of a circulation pump problem.
Dishwasher pump & motor assembly. If the dishwasher washes poorly the circulation pump and motor may be defective or the wash impeller damaged.