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The electronic control unit is an important part of the hybrid vehicle engine, which has a direct impact on the engine and the driving performance of the hybrid vehicle. In order to ensure the normal operation of the electronic control unit, the Dynamic simulation technology is used to optimize the design of the hybrid vehicle engine electronic control unit detection system. Modify sensor equipment such as temperature and speed, as well as signal processor equipment, adjust the connection method of the system circuit, and achieve hardware system optimization. The Dynamic simulation technology is used to simulate the electronic control process of the hybrid vehicle engine, and the detection standard of the system is set according to the operation characteristics of the electronic control unit under different fault types. Collect the output signals of the electronic control unit, extract signal features from both time-domain and frequency-domain aspects, and finally determine the status, fault type, and fault location of the electronic control unit through feature matching, achieving the detection function of the system"s electronic control unit. Based on the three operating scenarios of hybrid vehicle engines, it is concluded through system testing experiments that compared with traditional detection systems, the missed detection rate and false detection rate of the optimized design system have been reduced by 2.59% and 2.05%, respectively. This proves that the optimized design system has good detection function.