wired sound when engine off

since you have been a member for 8 years, i'm assuming you know all the sounds. however, if you are not generally around the car after you shut it off, they can be disconcerting

 

Yep that happens with the Prius. I actually found that when it begins to sound like an old 56K modem you need a new 12V.

 

Search YouTube for "Prius Sounds" These cars makes several types of sounds after power down, some within a few minutes of power off, and others seemingly hours after shutdown. All normal, as best I can determine.

 

the brakes, engine coolant and pollution control can all make sounds after the car is off. not sure what you heard, or even if they are separately identifiable.

 

My Vote is for the inverter coolant pump. That by the way is only an educated guess.

 

could be. does that run after the car is off?

 

You mean car will go to ready mode without owner pressing power button?

 

It usually kicks on for about ten to fifteen seconds a little while maybe thirty seconds to a minute after turning off the car. What ever it is, it is a small pump, so I eliminated the water pump as a source. Also since the car is off it's pulling off the small 12V.