This is an amazing book that unlocks all the problems associated with NO network condition, NO start condition and LOSS of communication between sensors, modules and the PCM. The book troubleshoots and reveal diagnostics procedures related with automotive computer systems. The book is quite simplified, you don't really need to be a mechanic to understand this book, all you need is to be able to read and write. The book addresses common diagnostics trouble codes like P0300, P0171, P0172 & P0174 in a very simplified way. The author of this book has extensive experience and knowledge of engine performance, electrical and electronics systems of all automobiles. This book is definately helpful, once you read and understand it, will be able to fix any automotive computer system problem and engine performance problems.