This study aims to analyze the effectiveness of the implementation of online learning during the Covid-19 pandemic in universities. This classroom action research refers to the model of Kemmis and McTaggart, in which there are four learning steps, which include planning, acting, observing, and reflecting. The implementation of the action was carried out in three cycles, whereas many as 18 students of the S1 Mechanical Engineering Education study program, Unesa became the research subjects. Data collection on student learning outcomes was carried out using test instruments. The data from the research results are then analyzed descriptively quantitatively based on predetermined success indicators. This study found that the implementation of effective, efficient, and innovative online learning can improve student learning outcomes during the Covid-19 pandemic. Based on the data on learning outcomes in the first cycle, it is known that only 44% or 8 of the 18 students achieved the complete criteria. These results then increased in the second cycle, where there were 61% or as many as 11 students who met the criteria. Meanwhile, in the third cycle student learning outcomes increased again, where 83% or 15 students out of 18 students reached the complete criteria.