p0446
Easy Fix
Chevrolet · Trucks
Evaporative Emission (EVAP) Vent Control Circuit Malfunction
Quick Answer
Error code P0446 on your Chevrolet Trucks means: Evaporative Emission (EVAP) Vent Control Circuit Malfunction. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
CK15706Colorado LT 2024Colorado Trail Boss 2024Colorado WT 2024Colorado Z71 2024Colorado ZR2 2024Silverado 1500 Custom 2024Silverado 1500 High Country 2024Silverado 1500 LT 2024Silverado 1500 LT Trail Boss 2024Silverado 1500 LTZ 2024Silverado 1500 RST 2024Silverado 1500 WT 2024Silverado 1500 ZR2 2024Silverado 2500HD High Country 2024Silverado 2500HD LT 2024Silverado 2500HD LTZ 2024Silverado 2500HD WT 2024CL14543CS10403CK10743CK10543CK20943CK30943CK10906
Likely Causes
How to Fix It
1
Locate the EVAP vent valve near the charcoal canister at the rear of the vehicle
2
Inspect the vent valve connector and wiring harness for damage or corrosion
3
Check the vent hose and filter for blockages or debris
4
Test the vent valve solenoid with a multimeter for proper resistance
5
Replace the vent valve assembly if it fails testing
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Parts You May Need
EVAP vent valve assembly
Wiring harness repair kit
Vent valve filter
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