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The Car Hacker’s Handbook by Craig Smith will give you a deeper understanding of the computer systems and embedded software used in modern vehicles. The book begins with a broad overview of potential vulnerabilities and provides detailed explanations of communications over the automotive network as well as between devices and systems. The book is aimed largely at penetration security testing, but is of a fairly broad scope and contains a lot of useful information for the casual car hacker who is interested in everything from adding an instrument cluster or entertainment system to completely altering their engine tuning.
This 275+ page, well-illustrated book is one of the best of its kind. If you are serious about hacking your car's network and computer systems, or developing hardware or software for automotive applications, then this book deserves a place on your shelf.