The constant error code CE-34878-0 is making Cyberpunk 2077 game crashing and unplayable on PS4 for some players.
Here is some tips that will help you on fixing CE-34878-0 error on PS4
Tip #1: Make sure to have enough free space on your PS.
Tip #2: Make sure you have the day 0 update installed.
Tip #3: Close the application, install the latest System Software and game updates then restart your system.
Tip #4: Re-install the original HDD (If you have upgraded the Hard Disk Drive).
Tip #5: Back up your saved data, then go to Settings, then Initialization and choose Initialize PS4.
Tip #6: If nothing helps, please contact PlayStation Support.
We hope we have helped you fix PS4 Error CE-34878-0 error so that you can enjoy Cyberpunk 2077 and all other games.