LG dishwasher noise: LG Direct Drive motor for the wash pump is quieter than belt-driven pumps but produces a low hum during operation. An unusual grinding noise = the wash impeller has debris. The self-cleaning filter on some LG models makes a whirring noise during the cleaning phase (normal).
When I show up to a noise call on an LG, nine times out of ten it's either debris in the pump impeller or a spray arm smacking a bowl. LG's Direct Drive motor is actually pretty quiet under normal conditions, so any new grinding or squealing is the machine telling you something's wrong. Ignore it and you're probably looking at a full pump replacement instead of a $0 cleaning job.
LG dishwashers are honestly some of the quieter units out there when they're running right, so when yours starts making a new noise, pay attention. The first thing I always ask is exactly when it happens in the cycle, because that timing tells you almost everything. Drain noise at the start is totally different from a wash-phase whine ten minutes in, and they've got completely different fixes.
Most Likely Causes
Based on aggregated repair data, here is the probability breakdown for this error code:
Foreign object caught in pump or drum40%
Worn drum bearing allowing shaft play24%
Loose drum roller or idler pulley14%
Loose counterweight or mounting bolt12%
Drive belt worn and slapping during operation10%
Symptoms You May Notice
A grinding or crunching sound right when the cycle starts, before any water even begins spraying, usually lasting 30 to 60 seconds during the initial drain phase.
High-pitched whining or squealing that kicks in around 8 to 10 minutes into the cycle once the water heats up and the circulation pump is running full speed.
Rhythmic thumping that repeats every second or two during the wash phase, like something spinning and hitting, sometimes loud enough to feel through the floor.
Rattling or vibrating noise from the bottom of the machine throughout most of the cycle, sometimes sounds like loose change in a dryer.
Loud buzzing strictly during the first couple minutes while the tub fills, then it quiets down completely once the wash starts.
Can you reset a Lg dishwasher to clear the NOISE code?
Flip the breaker off and leave it for a full minute, not just a quick flick. While the power's off, pull and clean the filter and shine a light into the sump. When you restore power, don't jump straight into a full cycle. Run a 'Rinse Only' first and listen. Quiet on the rinse cycle means it was probably a sensor glitch. Noise comes right back, that's mechanical and a reset won't fix it.
Tools Required for Diagnosis
Phillips #2 screwdriverFlathead screwdriverNeedle-nose pliersMultimeterFlashlight or headlampWet/dry shop vacWhite vinegar (for spray arm soak)Toothpick or small wire (for spray arm holes)
Service / Diagnostic Mode
On most LG dishwashers, press and hold the 'Rinse' and 'Spray' buttons simultaneously for 3 seconds until the display activates test mode and cycles through any stored error codes. On models with 'High Temp' and 'Steam' buttons, try holding both for 3 seconds. Sequences vary by model so check your specific manual if neither works.
Diagnostic Checklist
Follow these steps in order. We start with the easiest external fixes before opening up the machine.
ComponentComponent Under Test
Expected Range4–6 ohms
ConditionIf Open (OL) or infinite, replace component.
Frequently Asked Questions
How much does LG dishwasher noise repair cost?
Depends entirely on what's causing it. If it's just debris in the pump, a service call runs $75 to $150 and takes maybe 20 minutes. A new drain pump is $40 to $70 for the part, add labor if you're paying someone. The Direct Drive wash motor is the expensive one, around $80 to $120 for the part and closer to $250 to $350 all-in with labor. Honestly, I'd say about 60% of noise calls I go on end up being a free fix once we pull out whatever's stuck in the pump. Clean your filter first.
Is the noise my LG dishwasher makes normal?
Some of it, yeah. LG's Direct Drive motor has a low hum during operation that's totally normal. The self-cleaning filter on newer models makes a whirring sound during its cleaning phase, also normal. Water rushing through the spray arms makes noise. What's not normal: grinding, crunching, high-pitched squealing, or anything rhythmic and repetitive. If it's a new sound you haven't heard before, trust your gut. Something changed.
Can I fix LG dishwasher noise myself?
For most causes, absolutely. Clearing the filter and drain pump area is totally DIY, takes 10 minutes. Replacing a spray arm is maybe a 5-minute job with no tools. Swapping the drain pump is intermediate, you'll need to pull the unit out, but there are solid YouTube videos for your specific model. The wash motor is where I'd say call a pro unless you're already comfortable with appliance repair. But don't call a tech before cleaning your filter. I replaced three drain pumps last week and one of them just needed a good cleaning.
Why does my LG dishwasher make noise right at the start of every cycle?
That's the drain pump running first. LG always drains before filling, so a short 30 to 60 second drain noise at the very beginning is completely normal. If it sounds like grinding or rattling during that drain phase, something's caught in the impeller. Cherry pits and broken glass are the most common culprits. I pulled a marble out of one last month, no idea how it got in there. Check the filter and sump before anything else. That's your most likely fix.
How do I know if my LG wash motor needs replacing?
A few signs. It's a sustained high-pitched whine or squeal that gets worse over time, not just an occasional sound. You might also notice water pooling under the unit because a failing motor shaft seal usually leaks before the bearing fully fails. Test the windings with a multimeter and look for 4 to 6 ohms. Open circuit or way out of range, it's done. LG Direct Drive motors are actually pretty reliable and I don't replace them that often, but they do eventually wear out around the 7 to 10 year mark on heavily used units.
Which LG dishwasher models have the most noise complaints?
The older units from the 2015 to 2019 range had more bearing issues than the current lineup. The LDF5545 and LDF7774 series come up a lot in my service history. Newer models like the LDT7808 and LDFC2423 are quieter and better sealed. That said, debris in the pump can happen to any model. How often you clean the filter matters way more than which model you have. Monthly filter cleaning eliminates probably half the noise calls I get.
Same Fix Works on These Brands
Lg shares the same hardware platform with these brands. The diagnosis and repair steps are identical.