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2006 Buick Terraza Question: Replacing the gas cap

 

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koolkristi, 3.5L V6, Houston, TX, April 01, 2011, 06:24
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A couple of months ago my check engine light came on and my indicator warning periodically will flash check gas cap. I read the post about the loose gas caps so I bought a new one, but the light never went off and the indicator warning still flashes sometimes. I took the van to auto zone and had them run the codes and it came back with P0449 and P0455. Can you tell me what I should do?

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  • Answer #1

    April 01, 2011, 13:43
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     Master

    Yes these codes are for evaporative system malfunctions. P0455 is a very large or even gross leak and a P0449 is for a defective Evaporative Vent Solenoid Valve not working, which would trigger the P0455. A defective Vent Solenoid is pretty common on GM, I have replaced several.

    here are some shops:

    https://repairpal.com/directory?address=77053&car_brand_names=Buick

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