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I'm having the same problem with my 06'. Check engine light keeps coming on. Went to Autozone.. One of the codes that came up was P0449.
It's either a cracked/loose/missing/clogged hose or the canister is malfunctioning. or the vent solenoid? AND it came up "large leak"

I replaced the gas cap and the light went off after a couple of days.. but it came back on and I replaced the gas cap again, and the "check gas cap" light comes on about every day. I click the gas cap 4-5 times after fueling.??

I'm not exactly sure whats wrong???
 
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