An anonymous reader writes: The FBI and the U.S. National Highway Traffic Safety Administration are voicing their concerns about the potential risk of cars being hacked. In an advisory note, they urge the public to be aware of cyber-security threats revolving around connected vehicles. From the advisory, "Modern motor vehicles often include new connected vehicle technologies that aim to provide benefits such as added safety features, improved fuel economy, and greater overall convenience. Aftermarket devices are also providing consumers with new features to monitor the status of their vehicles. However, with this increased connectivity, it is important that consumers and manufacturers maintain awareness of potential cyber security threats." They are also advising drivers and manufacturers to ensure the vehicle software is up-to-date, and keeping an eye out for recalls.