Check Engine Light - Lose Gas Cap - Code 455
My balt is sending a "Please Check Gas Cap" message every time the tank drops below 3/8's a tank, and then the check engine light comes on the next time I start her up. I've connected a computer and the code shown is 455. Gas cap seems tight, and I double check to make sure. Reset the thing, and today, for the third time, check gas cap message and engine light comes on below 3/8's a tank.
Any ideas? Also going to call the local stealership's service dept, and see what they have to say. Should this be covered under warranty? The car only has 25.1k miles on it and is an 07.