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boss rosco

By boss rosco
in Ask A GM Technician

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boss rosco New Member

boss rosco

Posted
Posted

I have a 2005 chevy silverado Z71 crew cab. I had a dtc P0455, and a DIC message

"tighten fuel cap". I replaced the fuel cap, and had the sytem smoke tested. We found

the cannister was bad, so we replaced it,and reset the ecm. Now, I'm NOT getting a

dtc code or "check engine" light anymore, but the DIC still says "tighten fuel cap" quite

frequently. My local mechanic said the BCM(Body Control Module) probably needed to be reset. He checked it and said it wasn't showing any codes or faults. So now I'm clueless

of what to do next. Any help would be greatly appreciated. By the way the engine is a 5.3, auto trans.

skostur79 Enthusiast

skostur79

Posted
Posted

gm with a po455 if i had i nickel everytime i see that,

 

your need to check the vent valve operation is it holding pressure ??

 

or just replace it

 

bcm has nothing to do with it

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