Fix Sims 4 Lighting Not Working: Troubleshooting Tips

Joan Jul 01, 2026

Are you experiencing a frustrating issue in The Sims 4 where your lights refuse to work? You're not alone. This common problem can be caused by a variety of factors, but don't worry, there are solutions. Let's dive into the world of Sims troubleshooting and get your lights back on.

Metal & horror room sims 4
Metal & horror room sims 4

Before we start, ensure that your game is updated to the latest version. Updates often include bug fixes that could resolve your lighting issue. If you're still having trouble after updating, read on for more solutions.

The Sims 4 Lighting Mods
The Sims 4 Lighting Mods

Culprit: Mods and Custom Content

Mods and custom content can sometimes interfere with the game's functionality. If you've recently installed new mods or content, they might be causing the lighting issue. To troubleshoot, try removing any recently added mods or content.

an outdoor dining area with wooden chairs and umbrellas on the patio, lit up by string lights
an outdoor dining area with wooden chairs and umbrellas on the patio, lit up by string lights

To do this, navigate to your Sims 4 installation folder, then to the 'Mods' folder. Delete any recently added files, then restart the game. If the lights are working again, you've found the culprit. Reinstall the problematic mod or content one by one to identify the exact cause.

Conflicting Mods

a person sitting on a chair in front of a lamp with the words cozy lights mod kit
a person sitting on a chair in front of a lamp with the words cozy lights mod kit

Sometimes, two or more mods can conflict with each other, causing unexpected issues. To check for conflicts, try disabling half of your mods, then restart the game. If the lights are working, enable the remaining mods one by one until you find the conflicting pair.

Once you've identified the conflicting mods, you can either find a way to make them compatible or choose one to remove. Remember, it's always best to use mods from reputable sources to minimize the risk of conflicts.

Corrupted Save Files

7+ Sims 4 Lighting Mods That Will Make Your Game Look Amazing
7+ Sims 4 Lighting Mods That Will Make Your Game Look Amazing

Corrupted save files can also cause lighting issues. To check if this is the case, start a new game and see if the lights work. If they do, your save files might be corrupted. Unfortunately, there's no way to repair corrupted save files, but you can prevent future corruption by saving often and avoiding game crashes.

If you're attached to your current Sims and their progress, consider loading an older save file. Just be prepared to lose any progress made since that save point.

Game Configuration and Settings

More sensible lights for Maxis lamps – Pets/OfB/Seasons
More sensible lights for Maxis lamps – Pets/OfB/Seasons

Sometimes, the issue isn't with mods or save files, but with the game's configuration and settings. Let's explore some in-game solutions.

First, try toggling the 'Ambient Occlusion' setting in the game's graphics options. This setting can sometimes cause lighting issues, so turning it off might resolve the problem.

an image of a coffee bar with various items on the counter and behind it is a sign that says, functional coffee bar
an image of a coffee bar with various items on the counter and behind it is a sign that says, functional coffee bar
For Your Club
For Your Club
an info board with several different lighting fixtures
an info board with several different lighting fixtures
No.27 - a cc restaurant build by themintsimmer | mintsimmer
No.27 - a cc restaurant build by themintsimmer | mintsimmer
47+ Sims 4 CAS Backgrounds: CAS Rooms To Ellcrze Links - We Want Mods
47+ Sims 4 CAS Backgrounds: CAS Rooms To Ellcrze Links - We Want Mods
an artistic rendering of a purple room with lights and decorations on the walls, as well as furniture
an artistic rendering of a purple room with lights and decorations on the walls, as well as furniture
three different views of a building with plants growing on the windows and in the front
three different views of a building with plants growing on the windows and in the front
the different lighting styles are shown in this graphic style, including vases and bookshelves
the different lighting styles are shown in this graphic style, including vases and bookshelves
the floor plan for a home with three different rooms
the floor plan for a home with three different rooms
19+ Best Sims 4 Neon Lights CC & Mods (Download) 2024
19+ Best Sims 4 Neon Lights CC & Mods (Download) 2024
Modern cottage house 💛 | Hallway | Gallery ID: FleurSimss
Modern cottage house 💛 | Hallway | Gallery ID: FleurSimss
50+ SIMS 4 CC FURNITURE PACKS (bedroom)
50+ SIMS 4 CC FURNITURE PACKS (bedroom)
3
3
Nearly Invisible Light Fixture
Nearly Invisible Light Fixture
Sims 4 Bar & Nightclub CC + Lots (All Free) – FandomSpot
Sims 4 Bar & Nightclub CC + Lots (All Free) – FandomSpot
Mod Updates! + News | milo (on a break❤️‍🩹)
Mod Updates! + News | milo (on a break❤️‍🩹)
the lighting is not just downlights sign in front of a wall with lights on it
the lighting is not just downlights sign in front of a wall with lights on it
Transformez Votre Chambre avec ces 15 Idées de Décoration pour Gamers
Transformez Votre Chambre avec ces 15 Idées de Décoration pour Gamers
41+ Remarkable Sims 4 Reshade Presets - We Want Mods
41+ Remarkable Sims 4 Reshade Presets - We Want Mods

Graphics Rules

Graphics rules can also affect lighting in the game. To check your graphics rules, press Ctrl + Shift + C to open the cheat console, then type 'testingcheats true'. This will allow you to edit your graphics rules.

To edit your graphics rules, type 'boolProp testingCheatsEnabled true' in the cheat console, then press Enter. This will allow you to edit your graphics rules. Look for any rules that might be causing the lighting issue and disable them.

Resetting Your Game

If all else fails, you might need to reset your game. This will delete your save files and settings, so make sure to back up any important data before proceeding.

To reset your game, delete the 'Saves' folder in your Sims 4 installation directory. This will delete all your save files and reset your game to its default state. After resetting, start a new game and see if the lights are working.

Remember, patience is key when troubleshooting. Each solution might take some time to implement and test, but with persistence, you'll have your Sims' lights back on in no time. Happy Simming!