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I have a 2006 GMC Sierra and the code P0449 EVAP (Evaporative Emission System) purge/vent solenoid circuit condition keeps coming up. Will this malfunction make my truck hard on gas? Before the engine light came on for this code I was getting around 19mpg, after the check engine light came on I went down to 12mpg. PLEASE HELP!

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P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction.

 

This should not affect fuel mileage, maybe other conditions caused your fuel economy to drop. This is a cheap and easy fix though just replace the solenoid.

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This used to be a cheap fix. Now everyone wants to sell a $155 kit with a new filter - and you still have to purchase vacuum hoses and clamps. I drove mine around for several years with the check engine light because I refuse to pay that much for what used to be a $20 part. This caused no affect what-so-ever. A couple years ago I found the original solenoid on Amazon for $14 each and bought 2 of them.

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