This happened to me the other day. I've re-tightened the gas cap a couple of times. I filled the tank at a Valero gas station near my brother's place in a rural area of the state Sunday. The gas pumps were the older model without the Vapor Recovery Hose. Also my brother's driveway is in severe need of re-graveling,full of deep ruts that scraped the botton of poor Timothy The Tri-Toned Honda Civic Hybrid in a most alarming way.Was about to call my dealer about it, but now am not worried and will wait to see if it resets itself.