i just solved this problem with ours, there is a tube that runs from the drain pump housing to the white plastic water channel box on the side of the dishwasher. in the elbow closest to the pump housing, there is a anti syphon valve built into the hose it self. this keeps the dirty water from draining back into the dishwasher. there was a small piece if ceramic from a chipped plate stuc at this position. it was catching small debris and eventually caused a partial clog in the system causing the pump to start operating under strain causing it to make a loud noise. the dishwasher was not draining properly during the cycles causing it not to empty before the next cycle. As a result, when the next cycles water was added to the system it was causing the overfill sensor to trip, causint the overfill code to read on the controll panel. after a week of troubleshooting, i came to the conclusion that the pump was not working properly. as i was preparing to replace the pump i went ahead and checked every hose for clogs while it was apart. it now works properly and is quiet like a new unit.
hope this helps to anyone having this problem
