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Chevrolet TrailBlazer Forum : “check engine light is on”

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mikey674
10/26/2008, 3:02PM
About: 2004 Chevrolet TrailBlazer LS
check engine light is on

i had filled my tank with fuel then after driving fo a while my check engine light came on. I took the car to where i had bought it and told me the light came on because i did not tighten the gas cap enought.  Does this make any sence

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Adam4753
10/26/2008, 3:58PM

Yes, if you cap is not tight it will through a code. retighten the cap and the light should go off if not, get the code read (not erased) and go back to them with it.

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Fen3
10/26/2008, 6:36PM

It will set a code for the evap system. Just leave it alnoe, it will automatically turned off and ereased.

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Andrew5934
10/26/2008, 8:04PM

Your gas cap probably says "Tighten past 3 clicks."  This is exactly why.

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Michael8902
10/26/2008, 11:31PM

Yep, it triggers an evap leak code!!!

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FrootLoop
08/13/2009, 8:30PM

i'am getting a P0496 code on my 2004 trailbalzer , is this the purge valve, and is located under the engine cover ? Thanks.

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