Game keeps changing my sims hair colour.

Mods? Generally mods, not one mod used on one sim.
Remove them.

You may not be using any CC for him but it does not mean his sim is not affected by the CC his parents may have. Genetics could be part of the issue seeing the programming is already in that sim to grow up and possibly have the same things his parents have. Like if they have CC hair - the game is compelled to give the kids the same genetic compounds like hair and eye color the parents have - but if there is no CC hair in that CC for kids - then the game is just going to keep changing your sims hair as it cannot match the parents hair and is programmed to match it.

The game programming does not change just because you use CC on some of your sims. But you do have to keep in mind eye color, hair color, etc in kids needs to match one or the other parent. Means if they have CC hair you need the same color version of CC hair for the kids or take the games constant switching of the kids hairs like that and just have to change it back constantly yourself.

You cannot go by how Sims 3 worked as it had a palette of colors to mix and match any CC hair - Sims 4 does not have that or the programming to do such things. Your game can only do what it is programmed to do.

I have the same problem and no i dont want to remove mods

Ok thanks. I only have a few mods... I'll remove them and see if it makes a difference.

I have this same problem with my little girl sim. The game keeps giving her blonde hair when she changes clothes. I don't have any mods.

I have mods in the game but I'm currently not using any of them on any sims I have created. Just downloaded them out of curiosity. So I don't mind about removing them, just didn't think they'd affect sims since I am not actually using them. They are just clothing mods that I got from sims recourse.

I had the same problem on one Sim. What fixed it for me was going into full edit mode and altering the hair colors there. Didn't have a problem after that. Perhaps changing haircolors via "change appearance" doesn't make it permanent.

To go into full edit mode (basically taking you back to CAS but giving you full edit capabilities):

• Open the console (press Control+Shift+C)
  
• Type "testingcheats on" and press Enter (some people have to type "testingcheats true"). DO leave the space, but don't type the quotation marks.
  
• You should see a message saying cheats are now enabled (if not, try the "true" version)
  
• Type "cas.fulleditmode" (again, no quotation marks) and press Enter
  
• Shift-Click on the affected Sim and select the following option: Modify in CAS.
  

This should take you to the version of CAS where you can edit/change everything: physical, Aspirations, traits, cosmetics, whatever.

When you're done and back in your game, some say it's adviseable to manually turn testingcheats off (although others say testingcheats automatically turns off the next time you encounter a loading screen). I don't know for sure which works -- I turn them off manually now, just to be on the safe side.

Hope that helps! Good luck :).

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Edited to reflect that it is definitely a Shift-Click on the Sim and to specify the option's name "Modify in CAS"

> @SimPoseyYum said:
> I had the same problem on one Sim. What fixed it for me was going into full edit mode and altering the hair colors there. Didn't have a problem after that. Perhaps changing haircolors via "change appearance" doesn't make it permanent.
>
> To go into full edit mode (basically taking you back to CAS but giving you full edit capabilities): * Open the console (press Control+Shift+C)
> * Type "testingcheats on" and press Enter (some people have to type "testingcheats true"). DO leave the space, but don't type the quotation marks.
> * You should see a message saying cheats are now enabled (if not, try the "true" version)
> * Type "cas.fulleditmode" (again, no quotation marks) and press Enter
> * Click on the affected Sim and select the option that gives you access to CAS.
>
> This should take you to the version of CAS where you can edit/change everything: physical, Aspirations, traits, cosmetics, whatever.
>
> When you're done and back in your game, some say it's adviseable to manually turn testingcheats off (although others say testingcheats automatically turns off the next time you encounter a loading screen). I don't know for sure which works -- I turn them off manually now, just to be on the safe side.
>
> Hope that helps! Good luck :).

Thank you for this! I'll be sure to try it when I get home from work.

ok thank you. I'll try the CAS option and see if that works before removing mods. If that still doesn't work then I'll remove them. :)

Everyone is so quick to blame mods. I'd guess it's a game bug unless everyone has the same mods in their game. I've had the same issue crop up in my game and I have maybe two mods. Also there are issues with hair color and genetics I've had crop up prior to using mods.