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P0446 Diagnostic Trouble Code Discussion for September 2013

EVAP Vent System Performance

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Trouble Ticket Help Requests for DTC P0446
Help Request Posted
1999 Mercedes-Benz CLK430 4.3L No Start, Poor Idle Quality VIN: WDBLJ70G6X
P0446: Evap shutoff valve Function chain. This car will crank for a long time before starting cold. When it does finally start, it will stumble for 20 seconds or so, then runs smooth. If you put in gear it has no power cold. It runs perfect warm, with fuel trim around -5% after driving. Check engine l...
September 11, 2013
2008 Ford Escape Hybrid 2.3L MIL Lamp on VIN: 1FMCU59H18
P0446: . Have this Escape hybrid with evap canister damage. What I believe was the canister vent solenoid was completely missing as road debris hit canister. Electrical connector was ripped out. I have a violet wire (power) and red wire (ground), but I can not find wir...
September 17, 2013
2001 Chevrolet Silverado 1500 4.8L Excessive Emissions, VIN: 1GCEK19V01
P0446: EVAP Vent System Performance. Ok pay attention. I have tested every part of this evap system one by one in and out of the truck. Here is the issue. I can smoke test the truck with modis and it holds smoke and releases smoke. The issue I am having is that when running a bay test the vent va...
September 28, 2013