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This paper shows the application of sensitivity analysis to identify the most important network parameters impacting overshoot, undershoot and ringing of signals in CAN networks. Checking all worst case combinations of n network parameters would require 2n simulations or measurements which is not feasible for realistic CAN networks. Using results from sensitivity analysis, not only the number of simulations or measurements can be reduced thus saving time and cost, but also the ringing in CAN networks can be minimized to improve signal integrity. Simulation results have been validated using measurements and there is good agreement between simulation and measurement.