I've got an issue with my 2013 JEEP Wrangler Sport. It coded PO456. I replaced the gascap but it still coded. I had it smoked tested and it was good. No holes,but it still codes PO456. Any help would be great!

 

I fought this for a long time myself. I believe that more often than not, it's the control module itself on the evap canister. It's a cheap part that is easy to replace. I would swap that first before further troubleshooting. I just used the Dorman unit and have had no further issues since March (my jeep is a '13 as well so that factory one was 10+ years old) -

 

Welcome to the forum.. "Ditto" on resharp's post.

 

Thanks! I will try this!

 

Please report back with your findings. It's always useful in the future when other members search for answers.

Good Luck!