This is not a big deal, just that I'm a newcomer to the P38. I do not have the radio code in my documentation. I figured no problem, call a dealer with the VIN, and they can look it up. No dice, car is too old, MY2000. Even the original selling dealer flushed the info. So, I'm told that if I need to disconnect or switch out batteries, either make sure the radio is turned OFF, or alternatively plug a jump box into the cigarette lighter during the operation. There are generic codes that a dealer can plug in I'm told. Just looking ahead to that time when I have to cut the power, and wanted to not have a radio issue. Maybe all of you know this already, just new information to me.