My patriot came with towing as part of the warranty... it too is a 2012. Should have a card with a number on it for towing in your owners manual package. If the CEL is on, I ALWAYS scan it before going into the dealer. You can get a scanner cheap, under 20 bucks, and anybody who owns a car should have one, and know how to use it. If you don't have one, most auto zone/checker/ auto parts stores lend them out for free, or will scan your vehicle when you bring it to them. That way you can avoid the situation you had driving to the dealer, and could have told them the code(s) that were coming up before the light went off.
2012 FDII Patriot - Sold
http://goo.gl/h3lf9 - youtube channel.