sims 4 will not save. no mods, pc.

@Vkey103  Does this happen with new saves too?  Please create one, as a test, and let me know.

It works! What should I do with the old save file?

so, no this does not happen with new save files. 

@Vkey103  This means the problem is contained to your old files, which is good but also potentially more difficult to solve.  Try playing in a clean user folder:  Move the entire Sims 4 folder out of Documents > Electronic Arts and onto your desktop, and launch the game to spawn a new one.  Copy one of your old saves from the old folder to the new one (they're inside the saves folder, naturally), and see whether "Save" works.

Hello again. I started a fresh sims 4 folder as advised and moved an old save file from the saves folder to the new one and it still does not "save".😢

says" the game failed to save error code:0." - a major difference is that it now tells me it did not save again like it used too. 

@Vkey103  How large are your save files?  I'm wondering if they're too large for the game to manage properly.

Either way though, I don't know that there's a fix here.  If there are too many sims (in the thousands) or something else obvious, addressing it may help, but it's also possible that with these saves at least, you'll be stuck using "save as" for as long as you play them, or until something about the game itself changes in a future patch.

😢Ok, no problem and thank you very much for helping. But to answer your question and for some future pointers I could try,  The save file is titled "my saved game 256" and I have 98/150 allowable played sims (28 households). Any pointers for troubleshooting from this info? Like, is it as simple as changing my save file name for example? Also, will deleting townies help too or will the game replace the deletions? And is there a saving limit? 

@Vkey103  There are two separate questions here.  One is the size, in megabytes, of the save file itself.  I don't think there's a hard limit, but the larger the save is in absolute size, the more likely some problem will show up, whether it's trouble saving or something else entirely.

The other question is about the total number of sims, not just played sims but all unplayed as well, including those in hidden households that you might never know are there.  The only way I know of to find out is to use a mod: Show Sim Info by Frankk.  (Don't use the MTS version; it's outdated.)  Install the mod, click on a sim, and select Search all sims.  You'll see a window with a total number of sims at the top.

If there are an excessive number of sims, you may or may not be able to purge them: sometimes the game can hang if you try to delete them all at once, and deleting a few at a time is mind-numbingly tedious.  But I'm not at all sure that this is even the problem.  Deleting your played households isn't necessary and probably wouldn't help much.

You can of course change the save name if you want.  I don't expect it to help, but it's not going to do any harm.