Dishwasher Making Rattling Noise (Troubleshooting Guide)

On this page

Quick answer
Confirm the symptom
Tools and prep
Step-by-step troubleshooting
Common causes table
Parts matching
When to call a pro
FAQ
Related guides

Quick answer

Turn off the dishwasher and unplug it. Check for loose or broken parts like the spray arm, rack, or pump. Tighten or replace as needed.

Confirm the symptom

Rattling noise during wash or drain cycle
Noise only when dishwasher is running
No visible leaks but unusual sound

Tools and prep

Screwdriver (flathead and Phillips)
Flashlight
Plastic putty knife
Work gloves
Turn off power at circuit breaker
Empty dishwasher and unplug it

Step-by-step troubleshooting

Inspect Spray Arms
Do: Check for loose or broken spray arms and nozzles.
Observe: Loose or damaged spray arm.
Means: Spray arm is vibrating or loose.
Next: Tighten or replace spray arm.
Check Racks
Do: Look for loose or damaged dish racks.
Observe: Racks are loose or wobbling.
Means: Racks are not properly secured.
Next: Adjust or replace racks.
Examine Pump Housing
Do: Listen for rattling near the pump area.
Observe: Rattling sound from pump housing.
Means: Pump may have a loose component.
Next: Check pump for loose parts and tighten.
Look for Foreign Objects
Do: Search for small objects stuck in the dishwasher.
Observe: Foreign object found in spray arm or drain area.
Means: Object is causing the noise.
Next: Remove the object carefully.
Inspect Drive Motor
Do: Listen for unusual motor sounds.
Observe: Unusual motor noise or vibration.
Means: Motor may be failing or loose.
Next: Check motor mounting and connections.
Check Water Inlet Valve
Do: Inspect the water inlet valve for looseness.
Observe: Loose or vibrating water inlet valve.
Means: Valve needs tightening or replacement.
Next: Tighten valve or replace if damaged.
Examine Detergent Dispenser
Do: Check for loose or stuck detergent dispenser.
Observe: Dispenser is loose or not functioning properly.
Means: Dispenser may be causing the noise.
Next: Adjust or replace dispenser.
Test with Empty Dishwasher
Do: Run a cycle with no dishes or racks.
Observe: Rattling noise still present.
Means: Internal component issue.
Next: Further inspection or professional help may be needed.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Loose Spray Arm Vibrates during operation, causing rattling.	Common	Easy	Spray arm
Loose or Damaged Racks Wobbling racks can create noise during cycles.	Common	Easy	Dish racks
Loose Pump Components Loose parts in the pump housing vibrate and rattle.	Sometimes	Medium	Pump assembly
Foreign Objects Small items stuck in the dishwasher can cause noise.	Sometimes	Easy	N/A
Faulty Drive Motor A loose or failing motor can create unusual noises.	Rare	Hard	Drive motor
Loose Water Inlet Valve Vibrating valve can cause rattling during water intake.	Sometimes	Medium	Water inlet valve
Malfunctioning Detergent Dispenser A loose or stuck dispenser can rattle during operation.	Rare	Easy	Detergent dispenser
Worn Bearings Worn pump or motor bearings can cause noise.	Rare	Hard	Pump or motor assembly

Parts matching

Common parts needed for a rattling dishwasher:

Spray arm
Dish racks
Pump assembly
Water inlet valve
Detergent dispenser

Purchase OEM parts for compatibility and durability.

When to call a professional

Noise persists after checking all loose parts
You hear grinding or loud motor noises
Dishwasher leaks after attempting repairs
You're unsure about electrical components
Noise worsens over time

FAQ

Can a loose spray arm cause a rattling noise?

Yes, a loose or damaged spray arm can vibrate and create a rattling sound during operation. Tighten or replace it to resolve the issue.

Why is my dishwasher making noise when it's empty?

If the noise occurs when the dishwasher is empty, it may indicate an internal component issue, such as a loose pump part or motor problem. Further inspection is needed.

Is it safe to run the dishwasher if it's making a rattling noise?

It's generally safe to run the dishwasher briefly for diagnosis, but avoid prolonged use if the noise is loud or accompanied by other issues like leaks.

Can foreign objects cause a rattling noise?

Yes, small objects stuck in the spray arm or drain area can cause rattling. Always check for and remove any foreign items before running the dishwasher.

How do I know if the drive motor is faulty?

A faulty drive motor may cause unusual noises, vibration, or failure to start. If you suspect motor issues, it's best to consult a professional technician.