P0446 Evaporative Emission Control System Vent Control Circuit Malfunction

by JHawk
(Los Osos, CA)

P0446 Evaporative Emission Control System Vent Control Circuit Malfunction
Hello, I just checked Heater circuit fuses, then replaced the 02 sensor pre-cat passenger side near exhaust manifold. The original code before replacement was p0155. Now that code is gone, but the p0446 one pops up. Please tell me the order of checks to do next. This is on a 2003 4.3 liter Chevy S-10 2 wheel drive truck. Thank you very much.

Steve Says,

The most common cause of this problem is a problem with your fuel cap. It could also be caused by overfilling your tank or the solenoid on the charcoal canister.

I'm afraid there is no way for me to give you much more information than that without being able to test it. I hope this has helped.