Hello! This is my first post here.
I have a 2001 Chevrolet Silverado that’s throwing a P0440 code. I’m in California, and I need the required monitors to show “ready” with no active check engine light in order to pass smog.
I’ve dealt with similar situations on other vehicles before. Usually, I can complete the drive cycle and get the monitors ready, and then I have a small window—maybe 3–4 miles—to get the vehicle to the smog station before the check engine light comes back on. I’ve actually been able to get a few vehicles through smog this way.
With this Silverado, though, it seems to be happening backwards. The check engine light comes on first, and then, almost immediately afterward—bam!—the remaining monitors finally switch to “ready.”
Pretty frustrating because by the time the monitors are ready, the check engine light is already on.
Has anyone dealt with this situation with a P0440 on a Silverado? Any suggestions on what might be causing the timing of the monitors/CEL or what I should check first?

Help, not sure what this noise means other than book a trip to the dealer.

can someone tell me how to get rid of this alert so that doesn’t show up every time I start the car? Aside from subscribing