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P0446 Diagnostic Trouble Code Discussion for December 2012

EVAP Vent System Performance

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Trouble Ticket Help Requests for DTC P0446
Help Request Posted
2000 Honda Passport EX 3.2L Cuts out, Stall, MIL Lamp on VIN: 4S6CK58W1Y
P0446: EVAP Vent Control System Performance. the vehicle came in with a check engine light customer said had reduced power light on once in last 3 months did throttle sweep seems to be ok maf, map,o2, fuel trim, timing all ok, car runs fine know but has the intermittent reduced power
December 05, 2012
2000 Chevrolet Monte Carlo LS 3.4L MIL Lamp on, evap VIN: 2G1WW12E9Y
P0446: EVAP Vent System Performance. p0446 replaced 2 vent solenoids, and filler neck now light is back on. Try to turn on vent solenoid to smoke system, computer says too much vaccum. Plugged vapour line and now leak found.
December 12, 2012