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shifty · 05-02-2019, 09:14 AM

Oooh hey, I found a diagnostic page on the GM website which pertains to the L31, lists a bunch of diag codes and technical details on expectations.

https://gsi.ext.gm.com/gmspo/mode6/p...t57R_HD_yE.pdf (see page 33/40)

It mentions this exact error code with a bunch of diag info. Specifically says it points to a "restriction" in one of the following. I wonder if my vapor canister is just clogged?

When I popped off the vent valve, I took a whiff on the nipple and it smells pretty heavily saturated. I looked in the hole, it looked like the canister was just full of foam. I've heard others say there was cotton packing and charcoal in there. I guess this box isn't serviceable eh, if it needs to remain sealed.

05-02-2019, 09:14 AM	#15
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: P0446 mil Oooh hey, I found a diagnostic page on the GM website which pertains to the L31, lists a bunch of diag codes and technical details on expectations. https://gsi.ext.gm.com/gmspo/mode6/p...t57R_HD_yE.pdf (see page 33/40) It mentions this exact error code with a bunch of diag info. Specifically says it points to a "restriction" in one of the following. I wonder if my vapor canister is just clogged? When I popped off the vent valve, I took a whiff on the nipple and it smells pretty heavily saturated. I looked in the hole, it looked like the canister was just full of foam. I've heard others say there was cotton packing and charcoal in there. I guess this box isn't serviceable eh, if it needs to remain sealed. Attached Images __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.