One problem related to gas recirculation valve (egr valve) has been reported for the 2018 Hyundai Elantra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2018 Hyundai Elantra based on all problems reported for the 2018 Elantra.
Vehicle took twelve minutes to clear frost from windows at 30 degrees fahrenheit. Vehicle was stationary in parking lot at idle. Vehicle started to show sighs of defrost at six minute mark. Vehicle was drove one mile after clearing of windows and never went above first make on engine temperature gauge.