Look at the inlet where the dishwasher hose attaches to the disposal. Inside that nipple, there is a solid plastic or metal disc. If that disc is still there, your dishwasher has been trying to drain into a brick wall.
Water sputtering out of the air gap holes during the drain cycle; a gurgling sound. dishwasher drain cleaning
By committing to a and a hose flush every six months , you will extend the life of your dishwasher by years, eliminate foul smells, and ensure that your "sanitize" cycle actually leaves your dishes clean. Look at the inlet where the dishwasher hose