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this is the 3rd time in 6 months my check engine light has come on the on 2011 Chevrolet Impala

dealer keeps telling me its the gas cap. i know i'm putting the gas cap on correctly. what else can it be and why isn't the dealer looking for something else? this is making me crazy.

Asked by for the 2011 Chevrolet Impala
ASK THE DEALER IF THEY DID A SMOKE TEST TO DETERMINE IF VEH HAS A SMALL VAC LEAK TO START WITH
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1 more answer
I will assume the engine code says evap. system leak detected small. One possibility is the gas cap but, any hose or vacuum line break or component issue that has a leak can could throw this code. It is an emission recovery leak and the best way to find it is with a "smoke test". Inform the dealer you need this test performed to solve the issue.