Antwoord op "Apple diagnostics Ppt004 code"I have this error too after replacing the battery in my 2015 MacBook Pro 15” Retina. The battery is behaving normally and Coconut Battery App gives it a clean bill of health. I suspect too, protectionism by Apple who always seem resistant to any third party being involved in their machines as evidenced by the fact the latest machines cannot change RAM or SSD. I love this machine, but if I need to replace it, it will be with a Linux one. Apple have lost the plot to me, they’re far too arrogant for me.