What does p0446 code mean on the chevy colorado?

The p0446 code meaning on the Chevy Colorado is for evaporative emission control system vent control circuit malfunction. What this means is the EVAP or purge valve is not closing as it should. This is a canister that contains activated charcoal. It is responsible for making sure that the emissions from the car's fuel do not make it into the wild, or the cabin of the car. If this is not working then You will smell fuel in the car while driving. You will also fail an emissions test. While neither of these is critical, they should be addressed as they are both unhealthy and bad for the environment. A new canister will run You about 300 in total, which is less than the fine You will get if You get caught with a bad one.