There are a few reasons why your PlayStation 4 controller might be flashing red. One reason could be that there is something wrong with the controller. If you have a problem with your PlayStation 4 controller, then it might be worth taking it to a game store or mechanic to get it fixed. Another reason could be that the battery is low and needs to be replaced. If you notice your PlayStation 4 controller flashing red, then it might be time to replace the battery.
