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P0446 Diagnostic Trouble Code Discussion for May 2005

EVAP Vent System Performance

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Trouble Ticket Help Requests for DTC P0446
Help Request Posted
2000 Chevrolet Silverado 1500 5.3L MIL Lamp on VIN: 2GCEK19TOY
P0446: EVAP Vent System Performance. This is the second of the new body style chevys i have seen with this code this week, the first was a 1999 and after a tsb search i found a gm bulletin to replace the vent sol. and hose assy with an updated one. These are both farm/gravel road trucks. I am get...
May 04, 2005
2001 Cadillac Seville STS 4.6L MIL Lamp on VIN: 1G6KY54931
P0446: EVAP Vent System Performance. I have an 2001 caddy that shows PO446 -- a restricted or blocked evap vent path. Pulled off all the hoses from the charcoal canister to the vent solenoid, taken apart the vent solenoid, cleaned the filter, blew air through lines from the throttle body to the c...
May 23, 2005