After turning off, hybrid cars typically do not make any specific sounds. They generally operate silently, especially when the internal combustion engine is not running. This is because hybrid cars use a combination of an electric motor and an internal combustion engine. The electric motor provides power at low speeds and during acceleration, while the internal combustion engine kicks in at higher speeds or when more power is required.
When a hybrid car is turned off, the electric motor stops running, and the vehicle enters a state of complete silence. There may be some residual noises from the cooling fans or other systems shutting down, but these sounds are generally minor and not unique to hybrid cars. Overall, the absence of noise is one of the advantages of hybrid vehicles, as they produce less noise pollution compared to traditional gasoline-powered cars.