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I have an 07 sierra (not classic) with a 5.3l with around 68k miles. i am getting the p0446 code. i tried to blow out the vapor solenoid valve with air and after that i couldn't even fill my tank because it wouldnt vent at all.. Tech notes dirt and dust intrusion into the evap canister vent hose assembly, resulting in restricted air flow, may cause this condition. there is a bulletin for the following models:. This car has been a lemon since we owned it. first the electrical system shut down (while we were driving at 70 mph), then the wheel barrings needed replacing at 60,000 miles, and now the solenoid has gone bad preventing the car from shifting..
Most likely you have a bad vent solenoid. if you over fill your gas tank, the gas will eventually go into the vent tube and your vent purge valve will fail. i have heard of some people actually filling the charcoal canister with gas. if your check engine light is on, you should get the codes read. Tsb list for the 2007 chevrolet silverado. the tsb information displayed below are summaries. unfortunately we do not have access to the full versions.. What size leak does the code say? the canister vent solenoid should be open to atmosphere all the time until it decides it wants to pull a vacuum on the evap. system then the pcm should close the vent solenoid and open the vapor management valve which allows engine vacuum to be applied to the evap. system it will set a leak code when it cannot.
Video related with 2009 Silverado Evap Vent Solenoid
The vent control valve (also known as vent valve or evap vent solenoid) and vent hose (on the left of the vent control valve in the diagram) need to be checked for blockage; the vent control valve also needs to be tested; the vent control valve is an electrical solenoid valve that closes when the voltage is applied.. 02-09-12 02:51 pm - post# 2188878 in response to kashin found this: " ok everyone, listen up....if you have a 04 and newer silverado, with a failed evap vent solenoid, you have to read this info..