Zia's Auto Tip #324

8:33 PM
If you get a code P0446 on your old Tahoe, here's what you can do to fix it. This is pretty common. (This also could apply to old Yukons, Escalades, some Sierras and Silverados)

An intermittent condition could be caused by a damaged evaporative emission (EVAP) vent housing, a temporary blockage at the EVAP vent solenoid inlet, or a pinched vent hose. A blockage in the vent system will also cause a poor fuel fill problem.

An EVAP canister, vent hose, or vent solenoid valve that has restricted flow may cause this DTC to set. Using purge solenoid valve command with a scan tool will allow vacuum to be applied to the system instead of pressure. With the EVAP canister vent solenoid valve open and the EVAP canister purge solenoid valve commanded to 100 percent , vacuum should not increase to more than 9 inches H2O.

2 comments:

Susan Henshaw | January 1, 2009 at 9:09 PM

This is all fine and well, and I am impressed with your expertise, but I need to know about a 1994 Buick Park Avenue, please.

Grammie

Susan Henshaw | January 1, 2009 at 9:47 PM

Baby Zia - Grammie is so silly. You were doing a diagnostic for Auntie Dawn!

When the Buick has a problem, I will let you know, but until then, don't worry a second about it.

You know, Grammies are not always the sharpest nail in the pouch, but we are the funniest!

Love, Grammie

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