Is the code PO455, large evap leak, anything to worry about? Also it keeps saying to tighten fuel cap on the screen. How may this problem be resolved?

Asked by Nov 10, 2014 at 11:23 PM about the 2004 Chevrolet Silverado 1500 LS Ext Cab Short Bed 2WD

Question type: Maintenance & Repair

1 Answer

20,190

It is if you live where you have to get your vehicles inspected. It's almost never the gas cap. It's most likely going to be the vent valve or charcoal canister.

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