PO446 Code The Essential Guide to Evaporative Emissions System Troubleshooting

4) Take an air compressor and blow the vent valve out. 5) reinstall and clear the code and it's fixed. Now I know the updated part from gm is ... The code only means there is something wrong somewhere in the entire vent solenoid circuit, not necessarily with the vent solenoid itself. Truck has a misfire that is only noticeable when cruising between 40 and 50 MPH, which is even worse when you try to go uphill at those speeds. What is a P0446 Code? Better yet, what the heck is a Evaporative Emission System Vent Control Circuit? Well I ran into this problem with my ... P0446 EVAP Vent Problem. Getting The Parts Store To Give You Codes Is Not Fixing The Issue.. 36K views · 2 years ago #automotiverepair ... What does code P0446 mean? When code P0446 shows up on a diagnostic scan of your vehicle, a technician knows that there is something going wrong with your EVAP ... The symptom from my understanding was some fuel leakage on the floor when filling up and/or the inability to put gas in the truck without the pump shutting off ... C7 Tech/Performance - Evap code P0446 below 1/4 tank - I have a 2015 z06 and when im below 1/4 tank i got the code P0446. This code indicates that there's a problem with the vent valve, the control circuit for that valve, or a blocked vent valve in the EVAP system. P0446 is a result of a test failure. The PCM closes the vent solenoid and opens the purge valve. It then monitors the fuel tank pressure sensor.