It was the normal Beep, Beep-----as you get closer to the object in the rear and the cross traffic notification beeping and NOW for the past several months its more like a Tink--tink--tink sound, not sure why it would have changed. Way before now it would be the regular beeping and then the odd ball, but it would correct itself after a while but not now lol---any thoughts?

 

Sounds come through the speakers. My backup beep, door chime and phone volume were the symptoms I noticed. I found the drivers side door speaker blown. Once I replaced it, everything returned to normal.

 

Interesting, I've noticed a different sound from backup sensors in the last month, as you described it's changed to more of a tink-tink sound than beeping. Dealer did the PCM update for recall 24E03 back in August but the change in audio seems more recent.