Why is my Kia Niro's eco mode not working?

I have tried activating eco mode in my Kia Niro but it doesn't seem to be working. The fuel efficiency doesn't improve and the engine still revs at high speeds. What could be the issue?

It is possible that the eco mode in your Kia Niro is malfunctioning. I suggest bringing your car to a certified Kia dealership for a diagnostic check.

Have you tried checking your tire pressure? Low tire pressure can affect the fuel efficiency of your vehicle.

Check if the eco mode button is illuminated when you activate it. If not, there may be an issue with the button itself.