P0446
Low SeverityEVAP Vent Control Circuit
EVAP System
What Does P0446 Mean?
Fault in the EVAP vent valve circuit. The vent valve allows the EVAP system to breathe.
Common Fix
Replace EVAP vent valve
Estimated Cost (DIY)
$20 - $60
Symptoms
- ⚠️Check engine light
- ⚠️Possible fuel smell
- ⚠️Failed emissions
Related Symptoms
Common Causes
How to Diagnose P0446
- 1Check vent valve connector
- 2Test vent valve with 12V
- 3Inspect vent filter for blockage
- 4Replace valve
OEM Diagnostic Flowchart
Scroll to load technician if/then branches.
Read live data and freeze frame for P0446 to pinpoint the cause before buying parts.
Related Resources
Repair guides, symptom pages, and wiring diagrams related to P0446.
OEM Manual Evidence
Browse →A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL Denali AWD V8-6.2L Service Manual | Operation CHARM Operation CHARM : Car...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL Denali 2WD V8-6.2L Service Manual | Operation CHARM Operation CHARM : Car...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL 4WD V8-6.0L Service Manual | Operation CHARM Operation CHARM : Car repair...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL 4WD V8-5.3L Service Manual | Operation CHARM Operation CHARM : Car repair...
Related Symptoms
Browse →Exact Vehicle Hubs
Browse →Open the exact vehicle hub grounded by OEM manual evidence related to P0446.
Open the exact vehicle hub grounded by OEM manual evidence related to P0446.
Open the exact vehicle hub grounded by OEM manual evidence related to P0446.
Open the exact vehicle hub grounded by OEM manual evidence related to P0446.
Related Codes
Frequently Asked Questions
- Where is the EVAP vent valve?
- Usually near the charcoal canister, often under the vehicle near the fuel tank area.
- Can spider webs block the vent valve?
- Yes — this is surprisingly common. Spiders build webs in the vent, blocking airflow and triggering P0446.