I have the same problem with my 98' grand am se and I was told at a garage that to fix/replace everything it would run me around $3000 with labor fees so I just kept driving with the engine light on hope this narrows it down a little.
evaporative emission control system ,vent system performance code p0446
Trouble code P0446 means: Evaporative Emission System Vent Control Circuit
In many cases the fuel cap is at fault, or a cracked vapor/vacuum hose.
Evaporative emission control system / Vent control circuit malfunction. Don't ask me how to fix it, I got this from the Haynes Repair Manual.
Trouble code P0446 means: Evaporative Emission System Vent Control Circuit
Trouble code P0441 means: Evaporative Emission System Incorrect Purge Flow
Trouble code P0441 means: Evaporative Emission System Incorrect Purge Flow
The evaporative emission control system vent valve on a 2001 Chevy Express van is typically located near the fuel tank, often mounted on or near the canister assembly. It can usually be found underneath the vehicle, towards the rear, and may require removing some undercarriage panels for access. Always refer to a repair manual for the exact location and any specific removal instructions.
P0443 - Evaporative Emission ( EVAP ) system fault - Chilton repair manual P0443 - EVAP Vapor Management Valve ( VMV ) circuit fault - Haynes repair manual P0443 - EVAP Control System Cannister Purge Valve Circuit Malfunction - DTC codes
On a 2001 GMC Sonoma, the evaporative emission control system vent control circuit is typically located near the fuel tank. It is connected to the EVAP canister and may involve a vent solenoid that regulates the flow of vapors. You'll often find the wiring harness and connectors leading to this component near the rear of the vehicle, under the bed or near the fuel filler neck. For precise location, consulting a repair manual or service guide specific to your vehicle is recommended.
P0442 Evaporative Emission Control System Leak Detected (small leak) Can be a loose or defective gas cap, or many other things. Also check all vacuum lines.
Code P1450 often indicates an issue with the evaporative emission control system, specifically related to the pressure sensor or the purge valve. To fix the problem, you may need to replace the evaporative emission (EVAP) pressure sensor or the purge control valve, depending on which component is malfunctioning. Additionally, inspecting and repairing any vacuum leaks in the EVAP system could also be necessary. Always consult the vehicle’s service manual for specific diagnostic and repair procedures.