[envoyxuv]

P0446 refers to the evaporative vent solenoid used to test the evap system. During testing, the pcm uses it to seal the evap system and then observes vacuum decay (bleed to zero). If it doesn't see what it's looking for in a certain amount of time, the pcm sets this code. This indicates that there could be a restriction in the vent side of the evap system, and could be as simple as a plugged vent solenoid, or more difficult like diagnosing an electrical control problem or chasing evap pipes.

A P0440/P0442 code would indicate a fuel cap/evap system leak. You may want to have your code P0446 diagnosed at a shop.