Direct answer
Sewage odor indicates drain backflow, a missing high loop or air gap, a dry/blocked trap or household plumbing problem more than ordinary tub residue.
What this covers
- Dishwashers · drain plumbing
- The exact symptom in the title before component-level repair
- Consumer-accessible controls, connections and maintenance areas
What it does not cover
- ×Smoke, burning odor, swelling, liquid on powered parts or damaged wiring
- ×Opening sealed panels, bypassing interlocks or live-electrical testing
- ×Account ownership, billing or warranty disputes
Observe before changing anything
ReversibleCheck whether odor is strongest at the sink/disposal and whether dirty water appears in the tub after sink use.
Isolate the failing boundary
ReversibleInspect the high loop, air gap and disposal connection and have the household drain and vent checked.
Apply the narrow correction
ReversibleCorrect plumbing first, then clean the filter and run an approved maintenance cycle.
Verify the result and stop at the boundary
ReversibleStop for wastewater backup or leakage beneath the sink or dishwasher.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What should I check first for “Dishwasher smells like sewage”?+
Check whether odor is strongest at the sink/disposal and whether dirty water appears in the tub after sink use.
How do I know whether the problem is external or inside the device?+
Inspect the high loop, air gap and disposal connection and have the household drain and vent checked.
When should I stop and request repair?+
Stop for wastewater backup or leakage beneath the sink or dishwasher.
Answer for the exact device and software version shown above.