LG Dishwasher L2 Error Code: Secondary Leak Sensor
Quick Answer
L2 on an LG dishwasher is functionally identical to AE , a leak sensor in the base pan has been triggered , but it originates from a different sensor position than AE. The same diagnostic logic applies: start by unplugging for 2 hours to allow condensation to dry before assuming a real leak.
L2 shows up after heavy cycles way more often than people think, and roughly half the time it's just condensation. But here's the thing, if you ignore it and keep forcing the machine to run, water sits in that base pan and corrodes the wire harnesses. I've watched a $30 fix turn into a $400 control board replacement because someone kept hitting start. Don't be that person.
LgDishwasherSeverity: critical84% DIY Success
Time to Fix
20–60 min
Difficulty
beginner
Parts Cost
$15 – $38
Tools Needed
Flashlight, a bright one (phone flashlight works fine), Phillips #2 screwdriver
What Does the L2 Code Mean?
OK so when your LG throws an L2, the secondary leak sensor in the base pan got wet. There are two sensor points down there, and L2 is the one further back from the door. Honestly, the most common thing I see is wrong detergent. People grab those giant Costco pods or, worse, regular dish soap, and the suds go everywhere. Most of the time you're looking at a pretty cheap fix, or no fix at all if it's just condensation.
Most Likely Causes
Based on aggregated repair data, here is the probability breakdown for this error code:
Condensation from a hot cycle accumulating in base pan (false trigger)40%
Door gasket leak at lower corners24%
Over-sudsing causing foam to reach the base pan22%
Sump seal failure allowing water under the tub14%
Symptoms You May Notice
L2 sitting on the display and the machine won't budge, won't start, won't do anything at all.
Dishwasher stops cold mid-cycle, usually right after the main wash phase or during heated dry when temps are highest.
Both AE and L2 flashing back and forth, which means water hit both sensor zones and you've got a real puddle in there, not just a little condensation.
No water on your kitchen floor at all, no visible leak anywhere, because the sensor caught it before it escaped the base pan.
Machine beeps several times and then drains itself before shutting down completely. That's the LG safety protocol doing exactly what it's supposed to do.
Can you reset a Lg dishwasher to clear the L2 code?
Make sure that base pan is completely dry first, otherwise the reset won't stick. Pull the kick plate off and use a fan for 20-30 minutes if needed. Once it's dry, flip the breaker off, wait 60 seconds, flip it back on. Don't just unplug and replug. The breaker gives it a full hard reset. Power it back up and start a Quick cycle to confirm L2 is gone before you call it fixed.
Tools Required for Diagnosis
Flashlight, a bright one (phone flashlight works fine)Phillips #2 screwdriverFlathead screwdriver for kick plate clipsOld towels or rags for soaking up base pan waterFloor fan to speed up drying the base pan
Diagnostic Checklist
Follow these steps in order. We start with the easiest external fixes before opening up the machine.
Replacement Parts
If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.
Part Name
OEM Number
Estimated Price
Door GasketAHT73236503 · $22–$38
AHT73236503
$22 – $38
Leak SensorAEB72909507 · $15–$25
AEB72909507
$15 – $25
Frequently Asked Questions
What is the difference between LG AE and L2?
They're basically cousins. AE is the primary leak alert tied to the main sensor position in the base pan. L2 monitors the secondary zone, further back toward the sump. In practice I treat them both as a wet base pan warning, but L2 by itself tends to point toward condensation or sudsing issues more often than a catastrophic hose failure. If you're seeing L2 alone, take a breath before you panic. If you're seeing both codes, something's actually leaking and there's probably a real puddle back there.
If both AE and L2 appear, is it more serious?
Yeah, seeing both codes together means water covered both sensor points, so the base tray is pretty flooded. That's not a condensation situation anymore. At that point you're likely dealing with a failed drain pump O-ring, a cracked sump assembly, or a loose hose clamp that let go during a cycle. Dry the pan out completely, then pull the unit forward slightly and run a test cycle with the kick plate off. Watch closely. The drip source will show itself pretty quickly once you're looking in the right place.
Can I still run my dishwasher while I figure this out?
No, and honestly the machine won't let you anyway. It's locked out by design until that sensor dries out or the fault clears. But even if you could bypass it, don't. Running cycles with water in the base pan means that moisture sits against the wire harnesses and corrodes them over time. I replaced three control boards last month on units where someone kept overriding the error. Let it dry completely, confirm L2 is gone, then run one test cycle while watching the base pan before you go back to normal use.
What detergent should I use to stop L2 from coming back?
Stick to dishwasher-specific pods or powder and don't go over the fill line on the dispenser. Not regular dish soap. Not even a tiny squirt. I've seen a capful of hand dish soap fill an LG base pan with foam in about 4 minutes flat. Even pods marketed as 'extra clean' or 'grease cutting' can over-sud in LG's high-efficiency wash system. One pod per load, standard detergent, and you'll probably never see a suds-related L2 again.
How much does it actually cost to fix an LG L2 error?
Depends entirely on the cause. Condensation fix: free, just your time. Door gasket: $20 to $35 for the part, 45 minutes of work. Sump seal: $25 to $50 in parts, about an hour. Failed drain pump O-ring or cracked sump housing: $60 to $120 in parts. Having a tech come out to diagnose and repair any of this typically runs $150 to $300 depending on where you live. The good news is the majority of L2 causes land on the cheaper end of that range.
Why does my LG show L2 after every single Sanitize cycle?
Almost certainly condensation. Sanitize runs at around 155 degrees and all that steam has to go somewhere when it cools. If your kitchen isn't well ventilated, or if you run back-to-back hot cycles, moisture accumulates in the base pan faster than it evaporates. Try running Sanitize less frequently or cracking a nearby window. If it's happening literally every single time without exception, check whether the base pan drain path is partially blocked. Sometimes debris or detergent buildup blocks the small drain hole that's supposed to let condensation escape.