← View Generic P0446 Guide
Severity: Medium
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Vehicle-Specific Guide
This guide is customized for your 2021 Honda PASSPORT
P0446: Evaporative Emission Control System Vent Control Circuit Malfunction
on 2021 Honda PASSPORT
Fix Cost
$20 - $200
Parts & Labor
Difficulty
2/5
30 mins - 2 hours
DIY Possible?
✅ Yes
Save money
Your Vehicle
2021 Honda
PASSPORT
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Important for 2021 Honda PASSPORT Owners
Before starting repairs, verify which engine your 2021 Honda PASSPORT has. Check your VIN or engine code to ensure you order the correct parts.
📖 What Does P0446 Mean on 2021 Honda PASSPORT?
The EVAP system vent valve is not operating properly, preventing proper venting of the fuel tank.
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Symptoms
- • Check engine light
- • fuel tank may be difficult to fill
- • fuel odor
- • failed emissions test.
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Common Causes
- • Faulty EVAP vent valve
- • damaged wiring to vent valve
- • clogged vent filter
- • mechanical blockage in vent system.
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How to Fix P0446 on 2021 Honda PASSPORT
Replace EVAP vent valve, repair wiring to vent valve, replace vent filter, clear blockages in vent system.
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Need Maintenance Info for Your PASSPORT?
Get oil capacity, filter specs, and torque settings for your specific 2021 Honda PASSPORT.
View 2021 Honda PASSPORT SpecsParts for 2021 Honda PASSPORT
Essential Tool
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Related Diagnostic Codes
Other codes that may appear with P0446
P0440
Same System
Evaporative Emission Control System Malfunction
Low
P0441
Same System
P0441: Evaporative Emission Control System Malfunction
Medium
P0442
Same System
EVAP System Leak Detected Small Leak
Low
P0443
Same System
Evaporative Emission Control System Purge Control Valve Circuit Malfunction
Medium
P0455
Related Problem
EVAP System Leak Detected Large Leak
Medium
💡 Why These Codes Are Related:
- • Similar Issues: Same root cause or component failure
- • Related Problems: Often occur together due to system interactions
- • Sequential Codes: Progressive failure stages or multiple sensors
- • Same System: Components within the same automotive system