The Sims 4 Crashing After September 2026 Update: Fixes

The Sims 4 crashing after September 2026 update is worth troubleshooting from the Mods folder first on PC and Mac because EA says its top automated crash report during the Patch 1.128 investigation came from a conflict with outdated mod files.

That does not mean every September crash is caused by mods. Patch 1.128 also includes direct stability fixes for Mac, console gamepad directionality, Sim rendering, memory corruption and other crash paths. The safest process is to protect your saves, test a clean user folder, repair the game if needed and only then return updated mods in controlled batches.

The Sims 4 crashing after September 2026 update: quick answer

Platform	September 22 version
PC	1.128.90.1030
Mac	1.128.90.1230
Console	2.39
EA’s key mod warning	Outdated mod conflict was the top automated crash report
Safest first test	Run with Mods removed and saves backed up

The important thing with The Sims 4 crashing after September 2026 update is that a clean test is diagnostic, not a command to permanently delete your custom content. Move files out temporarily and keep backups until you know what caused the crash.

First steps for The Sims 4 crashing after September 2026 update

Close the game and copy your Sims 4 user folder or at minimum the Saves folder somewhere safe before changing anything. On PC, the normal user path is Documents > Electronic Arts > The Sims 4.

For The Sims 4 crashing after September 2026 update, move the Mods folder out of the live Sims 4 folder rather than deleting it. Then remove localthumbcache.package so the game is not testing stale cached data from files you have temporarily removed.

Back up Saves and any important Tray content.
Move the Mods folder to the desktop or another safe location.
Delete localthumbcache.package with the game closed.
Launch The Sims 4 without mods.
Create or load a disposable test save before opening your irreplaceable household.

If the game works with Mods removed

A successful clean launch points strongly toward a mod or custom-content conflict. Check each essential creator for a Patch 1.128-compatible version before returning files.

Do not put the entire old Mods folder back at once. For The Sims 4 crashing after September 2026 update, add updated script mods first in small groups, test, then return ordinary custom content in batches. That makes the problem file much easier to isolate.

Repair the game if a clean test still crashes

If the crash happens with no Mods folder, use your platform’s repair or file-verification feature. EA app users can use the Manage or Repair option for The Sims 4. Steam users can verify installed files through Steam.

A repair replaces damaged installation files without touching the separate user-folder backup you created. For The Sims 4 crashing after September 2026 update, this is safer than immediately reinstalling everything.

Console crashes after Patch 2.39

Console players do not have third-party Mods or CC, so skip the Mods-folder steps. Fully quit the game, restart the console, confirm Patch 2.39 is installed and test another household or a new save.

EA’s September notes specifically mention a change for gamepad directionality that was responsible for a large number of console crashes. If The Sims 4 crashing after September 2026 update continues on console, check EA’s current support channels before assuming a save is permanently damaged.

Do not save over a broken modded household

If menus are missing, Sims are distorted or interactions are failing after the patch, exit without saving until you have checked your core mods. Saving a household while a required gameplay mod is absent or broken can make later cleanup harder.

The safest response to The Sims 4 crashing after September 2026 update is controlled testing: backup, clean launch, repair if needed, then staged mod return.

The Sims 4 crashing after September 2026 update: what to do if it is not working

If The Sims 4 crashing after September 2026 update only happens in one save, test a brand-new save with no mods before declaring the installation broken. A single household can expose a separate save-specific issue.

If the game fails before the main menu even with the Mods folder removed, rename the whole The Sims 4 user folder temporarily so the game generates a fresh one. Keep the old folder safe so Saves, Tray, screenshots and settings can be copied back after the test.

Back up before troubleshooting.
Remove Mods without deleting them.
Clear localthumbcache.package.
Run a clean test.
Repair or verify game files.
Return only updated mods in small batches.

The Sims 4 crashing after September 2026 update FAQ

Did Patch 1.128 break every Sims 4 mod?

No. The Sims 4 crashing after September 2026 update can be caused by outdated mods, but that does not mean every mod is broken.

What versions should I have?

PC should show 1.128.90.1030, Mac 1.128.90.1230 and console 2.39 for the September 22 update.

Should I delete my Mods folder?

No. Move it somewhere safe for testing. For The Sims 4 crashing after September 2026 update, preserving your files and testing cleanly is better than deleting everything.

EA’s own crash investigation makes outdated mods the first thing PC and Mac players should eliminate, but a clean test also tells you when the problem lies elsewhere. Keep this The Sims 4 crashing after September 2026 update guide alongside the linked coverage below so you can move straight to the next objective without hunting through unrelated pages.