P0446 Code - Evaporative Emission Vent System Performance
Quick Answer
This Diagnostic Trouble Code (DTC) tests the Evaporative Emission (EVAP) system for a restricted or blocked EVAP vent path that would cause excess amounts of vacuum to be developed in the EVAP system. Common causes include Plugged vapor canister, Pinched or blocked EVAP hose, Faulty Evaporative Emission Vent Solenoid Valve. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
- What it means
- P0446 indicates Evaporative Emission Vent System Performance.
- Common causes
- Common causes include Plugged vapor canister, Pinched or blocked EVAP hose, Faulty Evaporative Emission Vent Solenoid Valve.
- Severity
- Low - monitor the vehicle and repair when practical.
- Can I drive?
- The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
Code P0446 Description
What are the Possible Causes of the DTC P0446?
- Plugged vapor canister
- Pinched or blocked EVAP hose
- Faulty Evaporative Emission Vent Solenoid Valve
- Evaporative Emission Vent Solenoid Valve harness is open or shorted
- Evaporative Emission Vent Solenoid Valve circuit poor electrical connection
- Faulty Fuel Tank Pressure (FTP) sensor
How to Fix the DTC P0446?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0446 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- P0446 Buick — Evaporative Emission Vent System Performance
- P0446 Cadillac — Evaporative Emission Vent System Performance
- P0446 Chevrolet — Evaporative Emission Vent System Performance
- P0446 Chrysler — EVAP Purge Solenoid Stuck Open
- P0446 Dodge — EVAP Purge Solenoid Stuck Open
- P0446 Ford — EVAP System Vent Control Circuit
- P0446 GMC — Evaporative Emission Vent System Performance
- P0446 Hyundai — EVAP Emission System Vent Control Valve Open Circuit
- P0446 Infiniti — Evaporative System Canister Vent Control Valve Circuit
- P0446 Isuzu — Evaporative Emissions Vent System Performance
- P0446 Jeep — EVAP Purge Solenoid Stuck Open
- P0446 KIA — EVAP Emission System- Vent Control Valve Circuit
- P0446 Lexus — EVAP System Vent Control Circuit
- P0446 Mazda — Evaporative Emission Control System Vent Control Circuit Malfunction
- P0446 Mercedes-Benz — Evaporative Emission Control System Vent Control Circuit Malfunction
- P0446 Mitsubishi — EVAP System Vent Control Valve Circuit
- P0446 Nissan — Evaporative System Canister Vent Control Valve Circuit
- P0446 Pontiac — Evaporative Emission Vent System Performance
- P0446 Saturn — Evaporative Emission Vent System Performance
- P0446 Scion — EVAP System Vent Control Circuit
- P0446 Toyota — EVAP System Vent Control Circuit
Frequently Asked Questions about P0446 Code
1. What does OBDII code P0446 mean?
P0446 indicates a malfunction in the evaporative emission (EVAP) vent control system, preventing proper control of fuel vapors from the gas tank.
2. What are the common symptoms of code P0446?
Symptoms include the check engine light turning on, a slight decrease in fuel efficiency, and potentially a fuel odor near the vehicle.
3. What causes the P0446 code to appear?
Common causes include a faulty EVAP vent control valve, a clogged vent hose, a defective charcoal canister, or electrical issues such as damaged wiring or connectors.
4. Can a loose gas cap trigger a P0446 code?
While a loose or damaged gas cap is more likely to cause other EVAP codes like P0455, it can occasionally contribute to P0446 if it affects system pressure.
5. How is P0446 diagnosed?
A technician will inspect the EVAP system components, check for blockages in the vent hose, test the vent valve's functionality, and use a scan tool to monitor system pressure.
6. Is it safe to drive with a P0446 code?
Yes, it’s generally safe to drive with this code, but it should be addressed promptly to prevent further damage to the EVAP system or increased emissions.
7. How much does it cost to fix a P0446 code?
Repair costs can range from $100 to $400, depending on whether the issue lies with the vent valve, charcoal canister, or other components.
8. Can a P0446 code cause a failed emissions test?
Yes, a P0446 code can cause your vehicle to fail an emissions test since it indicates a problem with the EVAP system, which controls fuel vapor emissions.
9. How do I fix a P0446 code?
Common fixes include replacing the EVAP vent control valve, cleaning or replacing the vent hose, repairing damaged wiring, or replacing the charcoal canister.
10. Can extreme weather cause a P0446 code?
Yes, extreme temperatures can sometimes cause the EVAP vent valve to stick or malfunction, triggering the P0446 code.
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