Question about 2006 Chevrolet Uplander

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Can you explain how the gas cap can cause a service engine light to come on in a 2006 chevy uplander with a 3.5L engine.

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The gas tank and emissions are under vaccum and a loose/bad seal or missing gas cap allows the vacuum to leak out when the pcm detects irregular vacuum it will turn the service engine light on.

Posted on Jul 06, 2010

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Lost key 2006 Chevy Uplander


It is possible that the key that he cut is a fraction out of align with the tumbler pins and that is registered as a wrong key combination. Have him check length of the key from the last tumbler to the pin . or take the key to a locksmith and see it anything can be explained as to why it will not turn

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I have been getting a check gas cap notification on my 2006 chevrolet uplander. i check it and it seems to be fine. Then i get a check engine light. Can the gas cap cause a check engine light to come on?


Yes. Any leak in the evap system can cause a check engine light. A smoke machine can be used to isolate the leak. You most likely have a purge solenoid or vent solenoid leaking when commanded closed. The most common being the vent solenoid, located under the vehicle

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Check air filter, valve on hose leading to engine, and electrical connection on air intake hose.... vacuum in gas tank loosen gas cap and reseal...bad gas can do this to fill with known good gas and run a tank...spark plugs need replacing @ 100,000 Ks or 60,000 Ms the manual recommends 100,000 but many mechanics have reported that the lower mileage is the actual.....

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1 Answer

I fueled my 2005 chevy uplander and now my check engine light is on, and gas gauge marks empty. I will run it and slowly the gauge will move to half and then back to empty. Check engine remains on.


I had the same problem, a friend said to check gas cap to see if seals properly, bought a new one and the problem went away something to do with the vacuum seal but I do not quite understand that

Aug 06, 2010 | 2006 Chevrolet Uplander

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I have a 2006 Chevy Uplander. When I fill up the


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Mar 28, 2009 | 2006 Chevrolet Uplander

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