Do gta online vehicle customizations sync with the single player mode?

There is no verified source that states vehicle customizations performed in Grand Theft Auto Online are synchronized with the single‑player campaign. Because the game’s online and offline modes use separate save files, many players have noted that changes made in one mode typically do not appear in the other. However, Rockstar has occasionally updated synchronization features, so the situation may change with future patches. As of the latest publicly available information, the customizations remain mode‑specific and do not transfer between GTA Online and single‑player gameplay.