Yellow light of death on dualshock

I recently got a ps4 pro from a friend, I factory reset it. When I turned the ps4 back on the controller turned yellow, it's not a constant yellow it's more fading. I've tried turning the ps4 off, taking the power cord out, pressing the controller reset button, I've even tried using my phones bluetooth with the controller(which the controller worked on my phone). I honestly dont know what to do as the controller worked perfectly before it was reseted…