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P0446 Diagnostic Trouble Code Discussion for March 2011

EVAP Vent System Performance

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Trouble Ticket Help Requests for DTC P0446
Help Request Posted
2007 Chevrolet Cobalt LS 2.2L MIL Lamp on VIN: 1G1AK15F97
P0446: EVAP Vent System Performance. This customer bought this vehicle about 6 months ago. Well when the weather turned cold her check engine light came on and the gas milage got bad and the car started running bad. I checked it out and found the car had been in an accident. They put the wrong ai...
March 10, 2011
2002 Hyundai Sonata 2.4L MIL Lamp on VIN: KMHWF25S42
P0446: EVAP Vent Control Solenoid Circuit Performance (Closed). ... P0442 (evap small leak ) and P0446 ( evap vent system failure ). We checked the system with our smoke machine and found the canister dump valve was stuck closed. It had good power and ground so we put a new vent valve on and retested it then cleared the co...
March 10, 2011
1997 Mercedes-Benz S320 LWB 3.2L MIL Lamp on VIN: WDBGA33G5V
P0446: Canister shut-off valve. ... DTC's stored (p1453, p1420, p0446, p0443, p1525, p0802). Originally the MIL bulb was burned out. Replaced bulb, cleared codes. Drove vehicle about 2 minutes and the exact above mentioned c...
March 10, 2011
1998 Chevrolet Blazer 4.3L Mil VIN: 1GNCS13W5W
P0446: EVAP Vent System Performance. ... seem to figure out why this p0446 code keeps coming back intermitantly. I replaced the vent valve with my fingers crossed because I couldn't find any failures, but code back in 100 miles. I have gone through the diagnostic tree and pulled all of the vent...
March 28, 2011