Check has cap message turned on

What this means is you have a leak in the evap system that is normally just a small leak. The quickest and easiest thing is to change the gas cap as the seal may be leaking.

However, if that is not it then these are not easy to figure out. We have to pull the system into a vacuum to see if it holds a vacuum. Basically you can do this at the purge valve and if the system holds a vacuum then the purge valve is the most likely issue. This would be great but a lot of times the lines are dry rotted and only leak at certain times.

Can we start with checking for codes and make sure we have a small leak. It should be a P0456.

I would then replace the gas cap hoping that takes care of it. If not we are going to have to hook a vacuum gauge to number 2 in the info below. This is the line going to the purge valve and then pull it into a vacuum and see if it holds. If it does, replace the purge. If it doesn't then you still have a leak in the system that we will have to narrow down.

Let me know if you have questions on this and we can go from there.