My engine light is on and the code d0nE came up. What does this mean?

What is your question?

Not having any problems . The engine light came on. So I tightened the gas cap thought that maybe the problem but it's still in. The code d0nE came up. What's this mean?

What makes this problem better or worse?

Nothing

How long has your 2013 Chrysler 200 had this problem?

Week