Guys,

My light came on on my tacoma yesterday. I went and had it checked and it is a code 446 :

Definition:
DTC P0446 Evaporative Emission Control System Vent Control Circuit
When the vapor pressure rises to a specified point, the ECM opens the VSV for CCV. Pressure will increase rapidly because of the air allowed into the system. No increase or an increase below specified rate of pressure increase indicates a restriction on the air inlet side. The ECM closes the VSV for pressure switching valve. This action blocks air entering the fuel tank side of system. The pressure rise on the fuel tank side is no longer as great. If there was no change in pressure, the ECM will conclude the VSV for pressure switching valve did not close.

Is this serious? Do I need to fix it right away or risk damage or can this wait?

Apparently it can be a couple issues and most of them are pretty expensive.

the jeep throws a simmilar code if the gas cap isnt on tight.

make sure that the rubber oring on it isnt cracker or leaking. If it is just pick up another cap

might also check if the dealer will warranty it

Had a similar thing and it was the gas cap as well


(it was on our actual mini-van, but I'm not allowed to say that out loud)