Got this interesting article from one of the automotive semiconductor vendors as part of my subscription:
Top 3 reasons your car won’t get hacked (today)

After the malware attacks on mobile devices running the Android operating system, speculations about automotive viruses have soared again. Compared to IT and telecom, the plague of car viruses has not (yet) arrived in the automotive industry. Open networks appeared in IT in 1985, and appeared in telecom 15 years later. It wasn’t until 2005 that open networks made it to automotive. IT-based attacks started to make headlines as early as 1990, and telecom followed 15 years later. Last year was the “year” of media coverage about attacks on cars. Apply this simple time pattern to malware: The virus phenomenon was widely seen in IT starting in 1995, and today we see it the telecom and mobile platform industries. Automotive is still unperturbed. For now.

Read the full article here: http://blogs.freescale.com/2011/11/07/top-3-reasons-your-car-won%E2%80%99t-get-hacked-today/