P0446: Evaporative Emission System Vent Control Circuit Malfunction
The ECM detects an electrical circuit failure (open circuit, short to ground, or high resistance) in the EVAP canister vent valve solenoid wiring or internal coil winding.
Driveability & Safety Advisory
Yes, safe to drive. Engine performance is unaffected.
Official Manufacturer TSB Advisories
Factory Condition: Wiring harness harness chafe at rear frame crossmember cuts 12V power supply to vent solenoid.
Physical Component Location & Service Access
Mounted on or directly next to the charcoal canister under the vehicle near the spare tire or fuel tank.
Electrical Specifications & Live PID Benchmarks
Scan Tool Live Data Targets
Digital Multimeter (DMM) Specs
Documented Model-Specific Case Studies
Root Cause: Corrosion in rear vent valve sub-harness connector.
Verified Fix: Solder new weather-pack pigtail connector.
Technician Inspection & Testing Workflow
Disconnect 2-pin connector at vent solenoid. Check for 12V with key ON.
Check ground side: Use test light to battery positive and command vent valve ON with scan tool.
Measure coil resistance with multimeter (should be ~20Ω).
Cost Breakdown
Tools & Parts Matrix
Diagnostic Questions & Answers
Why does my gas pump nozzle keep clicking off when filling gas?
When code P0446 is active, the vent valve may be stuck closed, preventing air inside the fuel tank from venting out while fuel is pumped in.