P0446 A Comprehensive Guide to Diagnosing and Resolving EVAP Vent Valve Problems

Code P0446 indicates that there is an improper voltage drop in the EVAP Vent Valve circuit, which can be caused by either too little or too much electrical ... My vehicle: 2004 Suburban 2500 LT, 4x4, 8.1L engine, Whipple supercharger. Bought from original owner with 208000 miles. DTC P0446 or P1450 indicates that Self-Test has detected the Evaporative Emission Control System has excessive fuel tank vacuum. Best way to test the purge valve is either a smoke machine to see if it' stuck open or to disconnect the line from the canister to the purge valve and place a ... I have an 04 Crew cab with the I5. My CEL light is on and I get the P0446 code (Evaporative Emission System Vent Control Circuit). General Tech Help - PO446 code and Misfire @ 2,4, and 6 - What is the main problem with trouble code PO446? Emission control? Problems/Service/Repairs - PO446 Error Code - I know that this code is an emissions venting problem that can be associated with the gas cap, ... This diagnostic trouble code (DTC) is a generic OBD-II powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996- ... The code P0446 is set when the engine computer recognizes a fault or restriction at the vent control part of the Evaporative emission control system (EVAP). The manual I have shows the canister on the PS firewall area, with the Evap. gas check valve near the bottom of the canister. The purge solenoid ...