I have a 2017 Ram 1500 and my check engine light is on, also when my check engine light came on my ECO light stopped coming on no matter what speed I am going. I brought the truck to autozone and had a diagnostic put on it. The report said that my gas cap is not tight, I tightened the gas cap but the engine light won’t turn off and my ECO mode is still not working. I don’t feel and vibration or difference in my fuel mileage. Has anyone encountered this???