Thermoelectric Generator (TEG) are one of the potential solutions for utilizing waste exhaust gas energy from internal combustion engines due to their direct conversion of heat energy into electrical power. Previous research on utilizing heat with TEGs has shown that highly hot surface temperatures and large temperature differentials can have an impact on the efficiency and lifespan of the devices. In order to address this issue, TEGs are being combined with exhaust gas heat recovery systems. The current paper will simulate the heat transfer process of utilizing waste exhaust gas energy for TEGs used in power generation, by determining the hot and cold surface temperatures of the TEG using the Ansys Fluent software. The simulation results demonstrate that the recovered heat by the TEG module with 24 thermoelectric elements is 1420 W, with a temperature difference between the hot surfaces and the cold surfaces ranging from 50 °C to 100 °C.