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Failed Smog Test

Chevy Silverado 2001 failed smog test trouble code p0449 OBD II. How to fix it?

What could be the problem with that code that I can fix I thought about the o2 sensors and air filter but what else what does the code mean and how to fix.


Trouble OBD II code P0449 refers your Chevy Silverado's evaporative emission control system vent valve or solenoid circuit. Trouble code P0449 can be caused by something as simple as a loose gas cap. We'd recommend filling a full tank of fuel and ensuring your gas cap is screwed on tight.


If in fact the problem was a loose gas cap, this trouble code should disappear within a weeks worth of everyday driving. If OBD II P0449 does not clear, the problem might be due to defective or loose EVAP vent solenoid connector or perhaps a defective vent solenoid itself.


Try our recommendation of filling up and tightening your gas cap, if the code reappears you may need a smog check repair station to replace the EVAP vent solenoid. The vent solenoid (also known as EVAP vent valve) on your Chevy Silverado should be located at the charcoal canister near your Chevy's fuel tank. An aftermarket vent valve can be found for as low as $30.00 from an auto part store, and should be able to be replaced without much effort; although we do recommend a professional smog check repair station conduct the repair and resetting of the trouble code.

posted by SmogTips Support 10-20-2010 11:01 AM

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