check engine light is on

Asked by Oct 26, 2008 at 03:02 PM about the 2004 Chevrolet TrailBlazer LS

Question type: General

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

7 Answers

8,695

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.

25

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

1 of 1 people found this helpful.
165

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

3 of 3 people found this helpful.
10,655

Yep, it triggers an evap leak code!!!

2 of 2 people found this helpful.
80

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

8 of 8 people found this helpful.
10

I have the same reason / the check engine light and turn off in 3 days ... it is repeated every 2 weeks light and turn off again I don't know the exactly reason ?

1 of 1 people found this helpful.

Finally my engine light off on my 07 trailblazer 4.2 after buying 3 purge valves and 2 gas caps from autozone that was the problem buying parts from them one gas cap from NAPA and a purge valve did the trick thanks NAPA

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