A question for Modern Warfare 4 players on PC: Activision lists "game crashes after installing the Season 1 update – Steam" as a known issue under investigation on its official Known Issues page. The same issue appears in Insider Gaming's list updated November 12, 2026. I have not found an announced fix yet.
Video: "Call of Duty: Modern Warfare 4 | Season 1 Launch Trailer", uploaded by the Call of Duty channel (October 28, 2026). It is the official Season 1 trailer, not a video about the crash: https://www.youtube.com/watch?v=nemUC34Q2hQ
Activision's official workaround, as written on its page: first verify the integrity of the game files in Steam; if that does not resolve it, uninstall Modern Warfare 4 and Warzone through Steam, delete the game's folder in steamapps\common, then reinstall Modern Warfare 4. That is a very large download, so I would like to know whether the first step is enough.
Tell us, in the replies:
- Did MW4 crash at launch after the Season 1 update on Steam? Right at the launcher, on the loading screen, or later?
- Did "Verify integrity of game files" fix it? Did you have to do the full uninstall and reinstall, and how long did it take?
- Your setup: GPU and driver version, Windows version, and whether other COD titles are installed.
- If you are not on Steam (Battle.net, Xbox on PC), is the game running normally for you since the update?
Please do not post account details or serial numbers. If you are still crashing, the Known Issues page links an official PC crash report form that helps the team investigate.
Sources: Activision Support, "Known Issues in Call of Duty: Modern Warfare 4" (https://support.activision.com/modern-warfare-4/articles/known-issues-in-modern-warfare-4, page undated, read November 13, 2026, Paris time); Insider Gaming, "Call of Duty: Modern Warfare 4 — List of Known Issues (Updated November 12)" (https://insider-gaming.com/call-of-duty-modern-warfare-4-known-issues/, November 12, 2026). The status can change: check the Activision page for the latest.
Version française de ce sujet : https://tricknfix.com/fr/sujet/mw4-plante-au-lancement-sur-steam-depuis-la-mise-a-jour-de-la-saison-1-la-verification-des-fichiers-a-t-elle-suffi-ou-avez-vous-du-reinstall-db41bb9948/