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P0446 2016 Chevrolet Silverado Code - Evaporative Emission Vent System Performance

Quick Answer

The P0446 diagnostic trouble code (DTC) in a 2016 Chevrolet Silverado indicates a problem with the Evaporative Emission Control System Vent Circuit. Common causes include Faulty Vent Valve: The vent valve may become stuck open or closed, preventing proper operation of the vent system, Blocked Vent: Debris or dirt can block the vent, causing a restriction in the system, Leak in the System: A leak in the hoses or connections of the evaporative emission system can trigger the P0446 code. 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 2016 Chevrolet Silverado indicates Evaporative Emission Vent System Performance.
Common causes
Common causes include Faulty Vent Valve: The vent valve may become stuck open or closed, preventing proper operation of the vent system, Blocked Vent: Debris or dirt can block the vent, causing a restriction in the system, Leak in the System: A leak in the hoses or connections of the evaporative emission system can trigger the P0446 code.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code P0446 2016 Chevrolet Silverado Description

The P0446 diagnostic trouble code (DTC) in a 2016 Chevrolet Silverado indicates a problem with the Evaporative Emission Control System Vent Circuit. This system is responsible for capturing and storing fuel vapors from the fuel tank to prevent them from escaping into the atmosphere. The vent system allows fresh air to enter the charcoal canister to displace the fuel vapors that are then purged into the engine and burned.

OBDII Code P0446 2016 Chevrolet Silverado - Evaporative Emission Vent System Performance
P0446 2016 Chevrolet Silverado Code - Evaporative Emission Vent System Performance

Common Causes of P0446 2016 Chevrolet Silverado

  1. Faulty Vent Valve: The vent valve may become stuck open or closed, preventing proper operation of the vent system.
  2. Blocked Vent: Debris or dirt can block the vent, causing a restriction in the system.
  3. Leak in the System: A leak in the hoses or connections of the evaporative emission system can trigger the P0446 code.
  4. Electrical Issues: Wiring problems or a malfunctioning PCM can also be the cause of the code.

Symptoms of P0446 2016 Chevrolet Silverado

  1. Check Engine Light: The most common symptom associated with the P0446 code is the illumination of the check engine light on the dashboard.
  2. Rough Idle: A malfunctioning evaporative emission vent system can cause the engine to idle roughly or stall.
  3. Fuel Smell: A strong smell of fuel inside or outside the vehicle may indicate a problem with the evaporative emission system.
  4. Failed Emissions Test: If the vehicle is subjected to an emissions test, it may fail due to increased emissions caused by the malfunctioning vent system.

How to Fix P0446 2016 Chevrolet Silverado

  1. Diagnose the Issue: Use a scan tool to retrieve the DTC and perform a visual inspection of the evaporative emission system components.
  2. Test the Vent Valve: Check the operation of the vent valve using a multimeter to determine if it is functioning properly.
  3. Inspect for Leaks: Check all hoses and connections for leaks using a smoke machine to detect any escaping vapors.
  4. Replace Faulty Components: Replace any faulty components such as the vent valve, hoses, or canister if necessary.
  5. Clear the Code: After completing the repairs, clear the DTC using a scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0446 2016 Chevrolet Silverado

The typical repair costs for addressing a P0446 code in a 2016 Chevrolet Silverado can range from $100 to $300, depending on the specific cause of the issue and the cost of parts. This estimate includes parts such as a new vent valve or hoses, as well as labor costs for diagnosis and repair. It's important to note that prices can vary based on location, vehicle make and model, and the rates of individual auto repair shops. It's recommended to obtain quotes from multiple shops to ensure a competitive price.

What does this mean?

Tech Notes for P0446 2016 Chevrolet Silverado

Dirt and dust intrusion into the EVAP canister vent hose assembly, resulting in restricted air flow, may cause this condition.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0446 2016 Chevrolet Silverado Code

1. What does the OBDII code P0446 mean on a 2016 Chevrolet Silverado?

P0446 indicates a malfunction in the evaporative emission (EVAP) vent system, which controls the release of fuel vapors from the fuel tank into the atmosphere.

2. What are the common symptoms of code P0446 on a 2016 Chevy Silverado?

Symptoms may include an illuminated Check Engine Light, a slight decrease in fuel efficiency, and potential difficulty refueling due to pressure buildup in the fuel tank.

3. What causes the P0446 code to appear on a 2016 Chevrolet Silverado?

Common causes include a faulty EVAP vent solenoid, a clogged charcoal canister, damaged or disconnected EVAP system hoses, or wiring and connector issues.

4. Can a loose gas cap trigger the P0446 code on a Silverado?

While a loose gas cap more commonly causes other EVAP codes, it’s still a possible contributor and should be checked first.

5. How do you diagnose the P0446 code on a 2016 Chevy Silverado?

Diagnosis involves inspecting the EVAP vent solenoid for proper operation, checking for blockages in the EVAP system, inspecting hoses and connections, and using a scan tool to monitor EVAP system pressure.

6. How serious is the P0446 code on a 2016 Chevrolet Silverado?

While it doesn’t typically affect drivability, it can cause emissions test failure and lead to increased fuel vapor emissions, so it should be addressed promptly.

7. How do you fix the P0446 code on a 2016 Chevy Silverado?

Repairs may include replacing the EVAP vent solenoid, clearing blockages in the EVAP system, repairing damaged hoses, or addressing electrical issues such as corroded connectors.

8. Where is the EVAP vent solenoid located on a 2016 Chevy Silverado?

The EVAP vent solenoid is usually located near the rear of the vehicle, close to the fuel tank, or mounted to the frame.

9. Can I drive my 2016 Chevrolet Silverado with a P0446 code?

Yes, you can drive the truck, but prolonged driving without repair may lead to additional issues, such as increased emissions or further damage to the EVAP system.

10. Will clearing the P0446 code with a scan tool solve the issue?

Clearing the code will turn off the Check Engine Light temporarily, but the issue will likely return unless the underlying problem is repaired.

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