I have seen several posts about the reduced engine power warning, but I haven't seen the check engine light with it. I got the warning yesterday while on the interstate (75 mph). It did not seem to lose power, I checked all the gauges and everything was normal. The warning went away after about 8-10 miles, but the check engine light is staying on. 2016 Titan XD 5.0 with 69k miles. Just asking before I take it in. I have not had the best experience with the service department at my dealer being straight with me.