P0446 2017 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 2017 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 2017 Chevrolet Silverado Description
What are the Possible Causes of the DTC P0446 2017 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 2017 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 2017 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 2017 Chevrolet Silverado code?
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Frequently Asked Questions about P0446 2017 Chevrolet Silverado Code
1. What does the OBDII code P0446 mean on a 2017 Chevrolet Silverado?
P0446 indicates an issue with the Evaporative Emission (EVAP) vent system, specifically a malfunction or restriction in the vent control circuit.
2. What are the common symptoms of code P0446 in a 2017 Chevrolet Silverado?
Symptoms include an illuminated Check Engine Light, possible fuel odors near the vehicle, and in some cases, difficulty refueling due to pressure buildup in the fuel tank.
3. What causes the P0446 code to appear on a 2017 Chevy Silverado?
Common causes include a faulty EVAP vent solenoid, clogged or restricted vent lines, electrical issues like damaged wiring or connectors, or a malfunctioning vapor canister.
4. Can I still drive my 2017 Chevrolet Silverado with a P0446 code?
Yes, the vehicle is generally safe to drive with a P0446 code, but it may fail emissions testing and could lead to reduced fuel efficiency or fuel system damage if not addressed.
5. How do I diagnose the P0446 code on a 2017 Chevrolet Silverado?
Diagnosis typically involves inspecting the EVAP vent solenoid for proper operation, checking for clogged vent lines, testing electrical connections, and using a smoke machine to detect leaks in the EVAP system.
6. How do I fix the P0446 code on my 2017 Chevrolet Silverado?
Repairs may involve replacing the EVAP vent solenoid, clearing debris or blockages in the vent lines, repairing damaged wiring, or replacing the vapor canister if it’s defective.
7. How much does it cost to fix the P0446 code on a 2017 Chevy Silverado?
Repair costs vary but typically range from $100 to $300, depending on whether the vent solenoid, wiring, or other components need replacement.
8. Can a loose gas cap trigger the P0446 code on a 2017 Chevrolet Silverado?
A loose gas cap is unlikely to cause a P0446 code but can trigger other EVAP-related codes like P0455 or P0442. It’s still worth ensuring the gas cap is properly tightened.
9. Does the P0446 code affect fuel economy on a 2017 Chevy Silverado?
While the code itself may not directly impact fuel economy, unresolved EVAP system issues could lead to inefficiencies over time.
10. Can extreme weather cause a P0446 code on a 2017 Chevrolet Silverado?
Yes, extreme weather conditions, such as heavy rain or freezing temperatures, can affect the EVAP system by causing moisture buildup or freezing in the vent solenoid or lines.
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