P0446 fixed.

Check Engine light came on last week, I had it scanned at AutoZone and P0446 Evap System was the code.

I removed my gas cap, cleaned the O-ring seal and the filler surface, and had the guy clear the code. The CE light came back on the next morning.

I crawled under the truck and inspected the hoses at the carbon canister, nothing wrong and no visible cracks in the canister itself.

The local dealer had a new gas cap in stock, so I grabbed it. Couldn't see anything wrong w/ my old cap, no cracks in the O-ring, but figured it was worth a shot. Sure enough, after installing it and re-clearing the error code it hasn't come back in the 30 miles I've driven.

Hope this helps somebody!

 

I had something similar but the gas cap worked for only a short time. Had to replace my EVAP VSV. It was awhile ago however and can't remember the exact code....but I do believe it was the 446. The 442 are the most common codes I get into my shop which is almost always been a loose gas cap in my past experience.

 

Had the exact same problem. I got a new gas cap at walmart last week and just unhooked the battery today. No more cel.