What does it mean when "gascap" message comes up on the dashboard?

Hello, it indicates a vapor leak from the evaporative emissions system which includes the fuel cap which is the most obvious area this system is sealed to the usual driver. First, I'd obtain a genuine gas cap from Jeep. You get what you pay for, and if you're going to spend hundreds of dollars to diagnose your concern, do yourself a favor and put a genuine proper gas cap on the Jeep first. If the problem happens again, then you'll need evaporative emissions system testing to see what's going on. This will include possibly introducing a smoke vapor into the system so any leaks present can be physically seen coming out from thhe source. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops