Warning: Disconnect power before servicing.
ErrBase

LG Dishwasher P1 Error Code: Pump Fault

Quick Answer

P1 on an LG dishwasher is a wash pump pressure or performance fault, distinct from LE which is a hard motor stall. P1 can appear when the pump is running but not achieving adequate spray arm pressure, often because of a partially clogged impeller or a degraded pump winding that is still turning but underperforming. The diagnostic path starts with the same impeller inspection used for LE.

P1 on an LG dishwasher is a wash pump pressure or performance fault, distinct from LE which is a hard motor stall. P1 can appear when the pump is running but not achieving adequate spray arm pressure, often because of a partially clogged impeller or a degraded pump winding that is still turning but underperforming. The diagnostic path starts with the same impeller inspection used for LE. The wash pump motor assembly (4681ED2003A) covers both LE and P1 faults.

LgDishwasherSeverity: highDifficulty: advanced80% DIY Success
Time to Fix
30–120 min
Difficulty
advanced
Parts Cost
$120 – $200
Tools Needed
Multimeter, Torx T20 screwdriver

What Does the P1 Code Mean?

P1 is a wash pump pressure fault. Check the impeller for partial blockage first. If clear, test motor winding resistance. The motor assembly 4681ED2003A covers both P1 and LE.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Partial blockage of the pump impeller reducing pressure40%
Wash pump motor winding degraded (low output before full failure)24%
Air leak in sump assembly allowing air into pump22%
Damaged or missing spray arm nozzle reducing system pressure14%

Symptoms You May Notice

  • P1 displayed during or after wash cycle
  • Wash cycle runs but spray arm pressure sounds weak
  • Dishes inadequately cleaned even on full cycle
  • Pump audible but cycle aborts before completion

Can you reset a Lg dishwasher to clear the P1 code?

After clearing any impeller blockage, unplug for 60 seconds and restart. If P1 was caused by debris, the pump will build normal pressure and the code will not return. If the motor assembly was replaced, test with a full normal cycle.

Tools Required for Diagnosis

MultimeterTorx T20 screwdriverFlathead screwdriver

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

1

Open the dishwasher

Open the dishwasher, remove the lower rack, and remove the lower spray arm by twisting counterclockwise. Inspect the impeller recess for any partial blockage -- food debris, small labels, or plastic fragments that may be restricting but not fully jamming the impeller.

2

Disconnect power

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
Wash Motor Assembly4681ED2003A · $120–$200

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs
Labor Approach
Our Verdict
BORDERLINE
Estimated Cost: $160 (Parts) vs $700 (New Machine)

Frequently Asked Questions

What is the difference between LG P1 and LE?
LE is a hard motor stall where the motor is mechanically locked or the winding has fully failed. P1 is a pump performance fault where the motor is running but not achieving adequate pressure. P1 can precede LE if the cause is a degrading motor winding.

Related Lg Dishwasher Error Codes

Code: LELG Dishwasher LE Error Code: Motor LockedCode: OELG Dishwasher OE Error Code: Drain FaultCode: HELG Dishwasher HE Error Code: Heater Fault

Same Fix Works on These Brands

Lg shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

Lg washerLG Washer Error Codes: Complete List With Fixes (2026)Lg washerLG Washer LE Error: Why the Motor Locked Up (Fix It Fast)Lg washerSUD on Your LG Washer? Too Many Suds (Here's the Real Fix)Lg washerLG Washer OE Code: Water Won't Drain (Troubleshooting Guide)Lg washerHow to Reset an LG Washer (Every Method, Every Model)Lg washerFE Code on LG Washer: Overfilling and How to Stop It

Models Known to Experience P1 Errors

This repair applies to most Lg dishwashers with this error code. Common model numbers include:

LDFN4542D, LDF5545ST, LDFS5788S, LDP6763ST, LDFN3432T, LDFN4542S, LDFN4542W

Last verified for technical accuracy on March 14, 2026