P0446 2016 Chevrolet Silverado 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 2016 Chevrolet Silverado 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 2016 Chevrolet Silverado Description
What are the Possible Causes of the DTC P0446 2016 Chevrolet Silverado?
- 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 2016 Chevrolet Silverado?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0446 2016 Chevrolet Silverado 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.
Need more information about the P0446 2016 Chevrolet Silverado code?
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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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