An old thread I know but may help someone looking in the future...
My CP came on after flat battery. Also lost the Front Assist and got a warning it was inactive every time i started the van. Couldn't reset no matter what i tried including holding Radio button for 30 seconds and cycling ignition. I tried Carista and a friend's garage software but was unable to remove it. Last resort I called a vw diagnostic centre and got a quote for £140, which thought fair enough I'll book it in before the summer!
Anyway, recently left my dashcam connected and not in park mode which drained my battery and reset clock etc after trying to start

. After charging, CP had disappeared and parking assist returned!
So, my recommendation if you have CP active, before you get pay a diagnostic centre, it can't hurt to disconnect the battery for a few hours and reconnect... you never know!