Remove the negative battery cable for 6 minutes and then replace.
The code PO441 means that the vehicle has an incorrect purge flow. The code PO446 is for the vsv vapor pressure sensor.
I ran a smoke test and found that the vapor canister had a leak at the seem. I put sealer on the seem and solved the problem no more po446 code!
Google the code and you will have the answer.
The P0446 fault code on a 2004 Chevy Avalanche typically indicates an issue with the evaporative emissions control system vent control circuit. This could be caused by a faulty vent valve, damaged wiring, or a problem with the ECM. It is recommended to have the vehicle inspected by a qualified mechanic to diagnose and fix the issue.
po446 is a large evap. system leak some times cause by leaving vehicle running while fueling up, or leaving cap off or loose after gassing up.
Evaporative Emission Control system vent control Circuit po446 code
PO446 code isÊa diagnostic code for Evaporative Emission Control System Vent Control Circuit.Ê The most common fix for this code is to replace the gas cap and make sure it is turned till you hear a click.
Trouble code P0401 means: Exhaust Gas Recirculation Flow Insufficient Detected replace the EGR valve Trouble code P0446 means: Evaporative Emission System Vent Control Circuit
Repairs for this will be covered for 36,000 miles or 3 years. These are codes set when there is a fuel vapor leak. Make sure your fuel filler cap is tight, clean, and sealed well, then drive for a few days and see if the light goes out before you bring it for repair.
Check your charcoal fuel canister. I had the same problem changed the light went out. The problem fixed.
Evaporative emission control system / Vent control circuit malfunction. Don't ask me how to fix it, I got this from the Haynes Repair Manual.
change the sencer related to the code and reset the computer problem solved drive safe