Fast ticking or light rattle during wash
The sound comes and goes as water sprays, and it often changes if you open the door and rearrange dishes.
Start here: Check for a spray arm striking a utensil, bowl, pan handle, or a dish hanging too low.
Dishwasher noise troubleshooting
Dishwasher Making Rattling Noise
Direct answer: Most dishwasher rattling comes from something simple: a utensil or tall item touching a spray arm, loose dishes knocking together, or debris around the filter area. If the sound is a hard rattle only during wash, start inside the tub before suspecting a motor.
Most likely: The most likely cause is the lower spray arm clipping a utensil, pan handle, or dish edge as it turns.
Listen for when the noise happens. A light plastic tick or rattle during wash usually points to spray arm contact or loose items in the racks. A rougher grinding rattle from underneath the tub, especially with poor cleaning or draining, points more toward debris in the sump area or a failing wash pump. Reality check: a dishwasher is never silent, but a new sharp rattle usually means something changed. Common wrong move: running cycle after cycle hoping it will clear itself while a utensil keeps chewing up a spray arm.
Don’t start with: Don't start by ordering a pump or motor because the dishwasher sounds loud. A true internal part rattle is less common than a loading or debris problem.
If the rattle starts right after loadingStop the cycle and check for a utensil, lid, or pan handle sticking into the spray arm path.
If the rattle comes from low in the machine even when racks are clearInspect the filter and sump area before thinking about replacement parts.
Last reviewed: 2026-04-04
What the rattling sounds like
Loose knocking from the racks
Glasses, bowls, or lightweight plastic items chatter against each other, especially early in the cycle.
Start here: Reload the racks so items are separated and stable, then run a short rinse cycle.
Rough rattle or grind from the bottom
The noise seems lower and harsher than dish contact, sometimes with weaker washing or bits left on dishes.
Start here: Inspect the dishwasher filter and sump area for broken glass, labels, seeds, or hard debris.
Rattle near the door or upper rack area
The sound is higher in the tub and may happen more when the upper rack is full or not seated right.
Start here: Make sure the upper rack is fully on its tracks and the upper dishwasher spray arm spins freely.
Most likely causes
1. Lower dishwasher spray arm hitting an item
This is the classic sharp rattle that starts after a different load arrangement. One spoon, pan handle, or tall plate can get clipped every rotation.
Quick check: Spin the lower dishwasher spray arm by hand with the racks loaded the way they were when the noise happened.
2. Dishes or utensils loaded too loosely
Lightweight bowls, lids, and utensils can chatter together under spray pressure even when no part is actually broken.
Quick check: Press on the noisiest items in each rack. If they wobble easily, reload and test again.
3. Debris in the dishwasher filter or sump area
Broken glass, fruit pits, labels, and hard food scraps can rattle around the pump inlet area and make the bottom of the machine sound rough.
Quick check: Remove the lower rack and filter, then look for hard debris around the sump opening.
4. Worn or damaged dishwasher spray arm
A cracked spray arm, loose end cap, or worn hub can rattle on its own and may also wash poorly.
Quick check: With power off, wiggle each dishwasher spray arm and look for splits, looseness, or rub marks.
Step-by-step fix
Step 1: Pin down where the rattle is coming from
You want to separate normal dish chatter from a real dishwasher part problem before taking anything apart.
- Start a wash or rinse cycle and listen for the first 1 to 2 minutes.
- Open the door as soon as the rattling starts and note whether the sound stops instantly.
- Look for anything obvious: a spoon through the rack, a pan handle over the lower spray arm, a lid leaning down, or a tall item near the upper spray arm.
- Check whether the noise seems to come from inside the tub, the lower front area, or the upper rack area.
Next move: If you immediately spot an item in the spray path or dishes knocking together, correct the load and retest. That's the fix more often than not. If nothing obvious is touching and the sound still seems to come from low in the machine, move to the spray arm and filter checks.
What to conclude: A rattle that stops the moment you open the door usually points to something moving inside the tub during wash, not a constant cabinet vibration.
Stop if:
- You smell burning plastic or electrical odor.
- You see water leaking onto the floor.
- The noise is a harsh metal-on-metal grind from underneath the tub.
Step 2: Check the spray arm path with the dishwasher loaded
The lower spray arm is the most common source of a repeating rattle because it only takes one misplaced item to hit it every turn.
- Turn off power to the dishwasher or leave the door open so it cannot start.
- Pull out the lower rack and inspect for utensils poking through, pan handles crossing the center, or large plates leaning inward.
- Reinstall the lower rack the way it normally sits and spin the lower dishwasher spray arm by hand.
- Repeat the same check for the upper dishwasher spray arm if the noise seemed higher in the tub.
- Look for fresh scuff marks on dishes or on the spray arm itself.
Next move: If the spray arm hits something or barely clears it, reload the rack so nothing crosses the arm path and run a short cycle. If both spray arms spin freely and nothing is rubbing, check for loose parts or debris around the filter area.
What to conclude: Visible rub marks or a spray arm that catches on dishes confirms a loading issue or a warped spray arm, not a pump failure.
Step 3: Inspect the dishwasher filter and sump area for hard debris
A bottom-end rattle often comes from debris bouncing around the filter or pump inlet area, especially after a broken glass or dirty load.
- Remove the lower rack.
- Take out the dishwasher filter assembly if your model has a removable filter.
- Check the filter screen for glass chips, bone fragments, labels, popcorn kernels, seeds, or other hard debris.
- Use a flashlight to inspect the sump area below the filter for anything loose.
- Wipe the filter clean with warm water and mild soap if it is greasy or packed with debris, then reinstall it securely.
Next move: If you remove hard debris and the next cycle is quiet, you found the cause. Keep an eye on cleaning performance for the next few loads. If the filter area is clean but the machine still rattles from the bottom, inspect the spray arms for looseness or damage next.
Step 4: Check for a loose or damaged dishwasher spray arm
A spray arm can rattle even with a perfect load if its hub is worn, the arm is split, or an end cap has loosened up.
- With the racks out or moved aside, spin each dishwasher spray arm by hand.
- Lift gently on each arm and feel for excessive wobble at the mounting point.
- Look for cracks along the seams, missing pieces, or a loose end section.
- Check for melted or chewed spots that show repeated contact with dishes or the heating area.
- If one arm is clearly damaged or very loose, replace that dishwasher spray arm.
Next move: If a new or properly secured spray arm stops the noise, run a full cycle and confirm wash coverage is back to normal. If the spray arms are sound and the rattle still comes from the bottom during circulation, the wash pump area is the next suspect and may be a pro call.
Step 5: Decide whether this is still a DIY fix or time for service
By this point you should know whether the noise was load-related, debris-related, a visible spray arm problem, or a deeper circulation issue.
- Run a short test cycle with the dishwasher empty except for the racks.
- Listen for whether the rattle is gone, still tied to spray action, or now clearly coming from underneath the tub.
- If the machine is quiet empty but noisy only when loaded, focus on rack loading and item placement.
- If the machine rattles empty and the filter and spray arms check out, schedule service for a likely wash pump or internal circulation problem.
- If the dishwasher also drains poorly, leaves grit, or cleans weakly, treat it as more than just a noise issue and stop running it until repaired.
A good result: If the empty test is quiet and a careful reload stays quiet, you can keep using the dishwasher and just watch your loading pattern.
If not: If the empty test still rattles from the bottom, don't keep forcing cycles. Get the circulation side inspected before a small problem turns into a leak or pump failure.
What to conclude: An empty-machine rattle after the easy checks usually means the problem is inside the dishwasher's wash system, not in the dishes.
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FAQ
Why is my dishwasher rattling only when it starts washing?
That usually means water pressure is moving something inside the tub. The first thing to check is a spray arm hitting a utensil, pan handle, or dish edge. Loose items in the racks can also chatter once the wash action begins.
Can a dishwasher filter cause a rattling noise?
Yes. Hard debris trapped in or around the dishwasher filter can bounce around and make a rough rattle from the bottom of the tub. Broken glass, labels, seeds, and small bones are common finds.
Is a rattling dishwasher always a bad pump?
No. A bad wash pump is possible, but it is not the first bet. Most rattling complaints turn out to be loading issues, spray arm contact, or debris in the filter area. Check those first before assuming an internal motor problem.
Why does my dishwasher rattle only with a full load?
That points strongly to dish placement. A full load makes it easier for a tall item or utensil to drift into the spray arm path, and tightly packed items can knock together under spray pressure.
Should I keep using the dishwasher if it rattles?
If it is a light rattle and you have not checked the load yet, stop and inspect before running more cycles. If the noise is harsh, comes from underneath, or is paired with poor cleaning, leaking, or a burning smell, stop using it until the cause is found.