One problem related to check engine light on has been reported for the 2017 Hyundai Tucson. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2017 Hyundai Tucson based on all problems reported for the 2017 Tucson.
I have owned my 2017 Hyundai Tucson since 10/20/17. In the last year I have had it at the dealership 3x for the check engine light. Twice my vehicle had performance issues while entering the highway and acceleration. It is life endangering. When accelerating onto the highway, the engine loses speed. The rpm gauge starts going wacky, off the charts. It will rev to 5 rpm back down to 3 rpm and back & forth. When the foot is on the gas peddle trying to increase to highway speed, the engine will go to 45 mph. When one a highway where the speed limit is 70 mph, it becomes life threatening. When I finally reached a speed of 70, it would go for a short time and then decrease to 50 mph. Very scary. Twice it was in service for the same performance issue . The 2nd time they replaced boost sensor range. It works ok now. However, the shifting of the transmission is hard and seems to shift improperly. It too is tied to the acceleration. Hyundai that is the natural performance on the engine & transmission. The last check engine was an alternator failure. I have owned 3 Hyundai's. I have helped my daughter buy her 2 Hyundai's. My mother as well. I have never seen these kind of issues. Also the natural hydraulic closing on the back door is a real safety hazard. One day the door started closing while my body was half inside. There should be a sensor to detect when there is an object in the way. That too is caused for alarm in safety. These 2 issues that I have written about can & will cause death.