The The Sims 4 Patch 1.128.90.1030 was released on September 22, 2026, bringing a large Quality of Life update to the PC version of the game. The patch also includes more than 95 bug fixes across the Base Game and various packs, with changes to Sim autonomy, interactions, relationships, infants, Build Mode, saves and game stability. However, players who use Mods and Custom Content should pay particular attention to this update because EA identified outdated mod files as a source of its top automated crash report during development and testing.
After installing the September update, some players may notice that their Mods and CC are disabled, missing from the game, causing unusual behavior, or simply not working as expected. This does not automatically mean that every Mod or piece of Custom Content is broken. The game normally disables Mods after updates as a precaution, while individual files may need to be updated by their creators to work with the new game version.
If you are seeing crashes, missing Custom Content, broken UI elements, Sims behaving strangely, or gameplay Mods that no longer function after Patch 1.128.90.1030, this guide explains the most common problems and what you can do before returning to your main save.
What Is Patch 1.128.90.1030?
Patch 1.128.90.1030 is the PC version of the September 22, 2026 update. Mac players receive version 1.128.90.1230, while PlayStation and Xbox players receive Version 2.39. EA describes the release as a substantial Quality of Life update based partly on player feedback from EA Forums, Reddit and Discord Developer Q&As.
The main focus of the update is Sim autonomy. The Sims Team changed dozens of behaviors to make Sims make more logical choices during everyday gameplay. Sims now face one another during conversations, are more likely to use an appropriate bathroom sink, and have adjusted autonomous behavior involving phones, gardening, dancing and other activities.
The patch also targets several crash causes and problems involving Sims becoming frozen or stuck in interactions. EA specifically says that fixing these issues was a major focus of the update.
For players without Mods, these changes are primarily improvements. For players with heavily customized games, however, changes to autonomy, interactions, UI behavior and tuning can affect Mods that depend on the previous version of the game.
Why Are Mods Disabled After the Update?
One of the first things many players notice after installing a Sims 4 patch is that Custom Content and Mods appear to have disappeared.
In many cases, the files have not actually been deleted.
The game can disable the option that allows Mods and Custom Content to load after an update. This is a normal protective step because a Mod that worked correctly before a patch may become incompatible after the game files change.
That means there are two separate situations that are easy to confuse.
The first is Mods being disabled by the game. Your files may still be safely stored in your Mods folder, but The Sims 4 is not loading them.
The second is a Mod actually being incompatible with Patch 1.128.90.1030. In that case, enabling Mods again can result in errors, missing features, crashes or strange gameplay behavior.
These are not the same problem.
Are All Mods Broken After Patch 1.128.90.1030?
No. It is not accurate to assume that every Mod or every piece of CC is broken after the September update.
However, gameplay Mods are more likely to require checking because they can modify systems that were changed in this patch.
The September update changes autonomy, interactions, relationship behavior and several technical systems. For example, EA modified interactions so Sims can navigate to the correct positions during conversations and adjusted how certain autonomous interactions are selected. The patch also introduced technical changes to interaction tuning that Mod creators may need to account for.
A Mod that changes one of these systems may continue to load while still producing unexpected behavior.
This is why simply checking whether the game launches is not enough to prove that every installed Mod is compatible.
The Biggest Mod Warning From EA
One of the most important details in the September patch notes concerns game crashes.
During its investigation, EA reported that its top automated crash report was caused by a conflict with outdated Mod files. The team also specifically addressed a Base Game issue involving a Mod that was corrupting memory and affecting a moderate number of players.
This does not mean that every Mod user will experience a crash.
It does mean that players should take outdated Mods seriously after this particular patch.
An incompatible Mod can cause much more than a missing interaction. Depending on what it changes, it can potentially affect memory, UI behavior, interactions, autonomy or game stability.
For this reason, restoring an old Mods folder containing hundreds of files immediately after updating is not the safest troubleshooting method.
Common Problem: Mods Are Missing
If your Mods were visible before the update but disappeared afterward, first check whether Custom Content and Mods have been disabled.
The game may have turned the setting off as part of the update process.
If your Mods folder still contains your files, there is no reason to assume they have been deleted.
Before enabling everything again, however, make a backup of the folder and your Saves folder.
Then check the creators of your most important gameplay Mods. Look for compatibility information specifically referring to the September 2026 update or Patch 1.128.90.1030.
EA Forums currently maintains dedicated discussions for broken and updated Mods and CC associated with patch 1.128. The community-maintained resources also warn that not every broken Mod is necessarily listed, so players should still test their own files rather than relying entirely on a single list.
Common Problem: CC Is Not Showing
Custom Content can behave differently from gameplay Mods.
If your clothing, hair, furniture or other CC is not appearing, first make sure the Custom Content and Mods option is enabled and that the game has been restarted after changing the setting.
If CC is still missing, check the location of your files.
Your Mods folder should be in the correct Sims 4 user-data location. If you recently moved the Documents folder, changed installations or restored files from a backup, it is worth confirming that the game is reading the same user folder where your CC is stored.
Another possibility is that a particular piece of CC depends on a resource or object that has changed.
Do not assume that all visual CC is automatically compatible simply because it does not contain a script. Some advanced CC can interact with game resources in ways that make compatibility more complicated.
Common Problem: Gameplay Mods Stop Working
Gameplay Mods are among the first files worth checking after Patch 1.128.90.1030.
This includes Mods that change:
UI behavior, autonomy, interactions, traits, careers, relationships, aspirations, menus, tuning, social interactions and other gameplay systems.
The reason is simple: the September patch changed several of those systems.
EA’s technical notes for Modders show that the update changed interaction behavior, autonomy tests, navigation and other tuning details. UI Mods may also need adjustments because the patch changed how certain interface elements behave.
If a gameplay Mod suddenly does nothing, produces an exception, removes an interaction or creates unusual behavior, check whether the creator has released a September 2026 update.
If no compatible version exists yet, temporarily remove the Mod rather than assuming it is safe.
Common Problem: Sims Behave Strangely
Not every strange behavior after the update is necessarily caused by a Mod.
The September patch itself changes many autonomous behaviors.
Sims should now face each other during conversations. They should be more likely to use a bathroom sink located near the toilet. Sims with low Energy should no longer randomly wake up to satisfy other needs, and Sims with the Dislike Phones preference should no longer perform the Browse Phone idle autonomously.
The update also changes dancing behavior.
Sims should no longer autonomously dance while painting, and Sims who dislike dancing should not autonomously start dancing. An affected stereo in an older save may also need to be replaced because the stereo-related dancing fix is not fully retroactive.
Therefore, if your Sim behaves differently after the update, check the official patch changes before immediately blaming a Mod.
Common Problem: Sims Freeze or Interactions Get Stuck
The September patch specifically targets several problems involving Sims freezing and interactions getting stuck in queues.
EA fixed an issue where time and Sims could freeze while the surrounding environment continued animating. The issue was connected to a Sim attempting to use an object while another Sim occupied the relevant position.
The team also fixed a major interaction-queue problem involving sleep and chat interactions, including group chats.
Other changes address interactions involving objects and situations where Sims could become idle or frozen after WooHoo when another autonomous interaction had been queued.
However, EA also states that some other freezing and cancelled-interaction problems are still being investigated.
This distinction is important. If your Sim still freezes after Patch 1.128.90.1030, that does not automatically mean the patch failed or that a Mod is responsible. There are multiple types of freezing problems with similar symptoms.
Common Problem: The Game Crashes After the Update
Crashes are one of the most important symptoms to investigate carefully.
The September patch contains numerous stability fixes, including crashes related to rendering Sim models in CAS or Live Mode, SimService, path planning, transitions from Build Mode to Manage Worlds, swimming pools inside contour walls, particle effects and entering CAS from the Simology Panel.
There are also pack-specific crash fixes for High School Years and Enchanted by Nature.
If your game crashes only when a particular Mod is loaded, that Mod becomes an obvious candidate for testing.
If the game crashes with Mods completely removed, the cause may be unrelated to Mods.
This is why a clean test is so useful.
Common Problem: UI Mods Stop Working
UI Mods deserve special attention after this patch.
EA’s technical notes mention changes to the Expanded Buff View and how the panel interacts with game-speed controls. The update changed the behavior so the expanded Buff panel should remain open when the player interacts with the time controls. EA specifically notes that UI Mods replacing the Buff panel or time controls may need to account for this behavior.
This is a good example of why a UI Mod can appear functional but still need an update.
The game may launch normally while one part of the interface behaves incorrectly.
If you use UI Mods, check their creators’ update notes before assuming that an older version is safe.
Common Problem: Save and Autosave Issues
The September update also contains several fixes related to saving.
Using Save and Exit or saving before returning to the Main Menu should no longer incorrectly create a new save file in the EA Documents folder instead of a versioned save connected to the original save.
EA also fixed an issue where restoring an Autosave and then manually saving could create an unnamed save or overwrite the wrong save slot.
These fixes are particularly relevant to Mod users because troubleshooting often involves repeatedly changing the Mods folder and testing saves.
Always keep a backup of your important saves before experimenting.
A troubleshooting test should never become the reason that a long-running legacy save is accidentally overwritten.
Common Problem: Infants and Cribs
The September patch also addresses several infant-related problems.
Infants could sometimes appear on top of one another or pop out of their Playmat or Crib after a lot or save was reloaded. EA also fixed a situation where certain infant interactions could be cancelled or blocked.
If you play with family households, test infant interactions after updating.
If the problem happens only when certain Mods are installed, remove those Mods and test again.
If it occurs in a clean game, it may instead be a Base Game issue that requires further investigation.
Common Problem: Build Mode and Roofs
Build-focused players also receive fixes in Patch 1.128.90.1030.
EA improved roof trim behavior so nearby geometry should no longer incorrectly clip or invalidate trim segments. The fix addresses problems involving platforms or half walls placed close to roofs with inward-facing eaves.
This is another situation where Custom Content can complicate troubleshooting.
If a Build/Buy item behaves strangely after the update, test the same build without CC. If the problem disappears, add your CC back gradually.
This can help distinguish between a Base Game building problem and an incompatible custom object.
How to Test Mods Safely
The safest approach is to avoid restoring your entire Mods folder at once.
First, make a backup of your Saves and Mods folders.
Then launch the game without Mods and CC.
Test basic gameplay.
Load a household, enter Live Mode, use common objects, open Build Mode and check CAS. Do not overwrite your most important save during this test.
If the clean game works correctly, start checking your Mods.
Update essential gameplay Mods first.
Then test UI Mods.
Then add smaller gameplay Mods.
Finally, restore CC in manageable groups.
If the problem appears after adding one group, you have narrowed down the possible cause.
This process takes longer than simply dropping the old Mods folder back into the game, but it makes troubleshooting much easier.
Do You Need to Delete Broken Mods?
Not necessarily.
If a Mod has not yet been updated, moving it out of the active Mods folder is usually enough while you wait for the creator to confirm compatibility.
Unsupported or obsolete Mods are a different matter. EA Forums’ community resources specifically distinguish between currently broken Mods, previously broken Mods, updated Mods and obsolete or unsupported content.
If a creator has abandoned a Mod and it is known to cause problems, keeping a backup outside the active Mods folder is more useful than repeatedly testing the same outdated file.
What Players Should Check First
If you installed Patch 1.128.90.1030 and something is wrong, start with the simplest possibilities.
Check whether Mods and CC were disabled.
Check whether the game is running the correct patch version.
Back up your Saves and Mods.
Launch once without Mods.
Check your major gameplay Mods for September compatibility.
Check UI Mods separately.
Test CC in smaller groups.
Watch for crashes, Last Exceptions, missing interactions, broken menus and unusual Sim behavior.
If a problem disappears when Mods are removed, investigate your Mods before assuming that the Base Game is broken.
If the problem remains in a clean game, look at the official patch notes and known Base Game issues instead.
Final Thoughts
The The Sims 4 Patch 1.128.90.1030 is a significant maintenance update, especially for players who use Mods and Custom Content. It includes more than 95 fixes and improvements, while also changing autonomy, interactions, relationships, saving, stability and several other systems.
The most important point is that not every Mod is automatically broken. The game may disable Mods after the update as a precaution, while individual Mods may or may not require updates.
At the same time, players should take compatibility seriously because EA specifically identified outdated Mod files in its crash investigation.
If your Sims 4 game is crashing, your CC is missing, a UI Mod is behaving strangely, Sims are freezing or a gameplay Mod no longer works, start with a clean test rather than immediately deleting everything.
Back up your saves, check creator updates, test without Mods, and restore compatible files gradually.
The September 2026 patch is designed to make The Sims 4 more stable and improve everyday Sim behavior. Keeping your Mods and CC organized and updated will make it much easier to benefit from those changes without introducing new problems into your game.
