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As a key equipment in the construction of commercial vehicle maintenance service chain, a fault diagnosis system based on J1939 protocol is designed. The system extends the conventional on-board fault diagnosis system, and uses the wireless communication technology to upload the J1939 vehicle fault messages and GPS location information to the vehicle monitoring center in real time. The goal is to design a full vehicles service network for vehicles monitoring, fault diagnosis and prediction. The system takes Cortex-A8 as the main controller and the embedded Linux as the platform, including the fault collection and analysis module. Qt is used to design the user interface. After repeated testing, the fault diagnosis can be done fast and accurately, and the wireless transmission data is transmitted real-timely and the packet loss rate is low.