Evaporative Emission Control Mysteries Solved Unraveling P0446 Code

P0446 is not an electrical issue--it indicates a physical blockage in the vent portion of the evap system. How to fix a Chevy / GMC P0446 engine Code: Evaporative Emission Control System Vent Control Circuit Malfunction Amazon Link to Smoke ... This DTC checks the EVAP system (Figure 2) for a restricted or blocked vent path. The scan tool being used to check this system is the GM Tech 2. Seasons Greetings All, My service engine light is on and the tech at Quick Lube said this is the error code that is reporting. "P0446 EVAP ... P0446 indicates an Evaporative Emission Control (EVAP) system vent control circuit malfunction. Typically, this indicates a faulty vent valve. i'm trying to solve my ECU P0446 light. Just changed the Gas cap, old one was pretty lose. I did restore the codes ( temporary and confirmed ) ... Possible causes · Missing Fuel cap · Incorrect fuel filler cap used · Fuel filler cap remains open or fails to close · Foreign matter caught in ... This code is directly connected to the vent valve, vent valve wires, and vent valve tube. So you'll see it if there's wiring issues, a leak in the tube, or ... 2005 Prius (186k miles) throwing the P0446 error code (Evap Emission Control System Vent Control Malfunction). It was in the shop twice last year for this. With a P0446 OBD-II trouble code, here are some things to try: Replace Vent valve, Repair open, short, or resistance problem in control circuit, Repair open, ...