Question about 2004 Chevrolet TrailBlazer

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Gas tank cap loose, is this can also trigger "service engine soon" light? and how can i replace cap?

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Yes it can trigger the service engine light if the cap is loose replace it so it will build up the pressure in the tank. the seal is probably worn out and won't seal the preasure in

Posted on Sep 06, 2009

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I HAVE CODE 0440 MY SERVICE SOON LIGHT ON I FIX FUEL CUP BUT STILL ON LIGHT WHAT TO DO


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2004 GMC Envoy, My service engine soon light came on. I took the vehicle to a mechanic and the code came back po422. A smoke check was performed and they said it had a leak in the filler neck and the...


Hello: Without being there when the smoke test was performed no one can say what the results of the smoke test were. I would go back to the dealer and speak to the service director/service manager and request a new gas cap.

Jan 19, 2011 | 2004 GMC Envoy

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My service engine soon light was on. I took the vehicle to a mechanic and the code came back po422. A smoke check was performed and they said it had a leak in the filler neck and the entire gas tank needed...


If they forgot to tighten the hose clamps on the hose from the tank to the filler cap it could be setting it off. If they are all tight it was probably just the gas cap. The gas cap is usually ALWAYS the culprit. Let me know if this helps

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The "service engine soon" light on the dash came on and stayed on about the same time as a "gas cap loose" message came on on the info panel. The cap isnt loose and the car seems to run fine. I pulled the...


the eec is the sensor for the evap system, either the gas cap is leakin or one of the hoses, the system is made to keep the gas tank at minus 1 lbs pressure, anything that disrupts this will send a message, could also be the fuel tank itself

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My Ford Explore 2003 has engine service soon light on. What shall I do with it?


Go to an autozone they can read the codes and reset the light. They do this as a free service. If there is a problem and you dont repair it the light will return. Sometimes the light can come on for no apparent reason (no code present) a loose gas cap can trigger the check engine light.

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Service engine soon light comes on when driving


this can be anything and as simple a s a loose gas cap...lots of things trigger this

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Jeep Grand Cherokee Service engine light soon on


A loose gas cap will sometimes trigger the service light to come on.  Since this appears to have happened on multiple occasions I can assume that this is not the problem but may be associated with it.  The level of gas in the tank affects the amount of atmospheric pressure in the tank. There are multiple things that could set off the light, one being a loose or defective gas cap, and the other is a fuel vapor return valve.  I'm not sure of the exact type of fuel system you have so I cant give a more exact answer.  If you wanted to give something a shot before bringing it into the shop, you can simply replace the gas cap first, a very cheap try. 

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