P0446 2018 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 2018 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 2018 Chevrolet Silverado Description
What are the Possible Causes of the DTC P0446 2018 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 2018 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 2018 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 2018 Chevrolet Silverado code?
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Frequently Asked Questions about P0446 2018 Chevrolet Silverado Code
1. What does the OBDII code P0446 mean on a 2018 Chevrolet Silverado?
P0446 indicates a problem with the evaporative emission (EVAP) vent system, specifically an issue with the vent valve's performance or control.
2. What are the common symptoms of code P0446 in a 2018 Chevrolet Silverado?
Symptoms can include an illuminated check engine light, a possible fuel odor near the vehicle, and difficulty refueling due to pressure buildup in the fuel tank.
3. What causes the P0446 code to appear on a 2018 Chevy Silverado?
Common causes include a faulty EVAP vent valve, a clogged or restricted vent hose, damaged wiring or connectors, or a malfunctioning EVAP system control module.
4. Can a loose gas cap trigger the P0446 code on a 2018 Silverado?
While a loose gas cap often triggers other EVAP codes, it is less likely to cause P0446. However, inspecting the gas cap for damage or improper sealing is still recommended.
5. How do you diagnose the P0446 code on a 2018 Chevrolet Silverado?
Diagnosis typically involves checking the EVAP vent valve operation, inspecting the vent hose for clogs or damage, testing the wiring and connectors, and using a smoke test to identify leaks in the EVAP system.
6. Is it safe to drive a 2018 Silverado with the P0446 code?
Yes, it is generally safe to drive, but the vehicle may fail an emissions test, and unresolved EVAP issues can lead to fuel vapor leaks or reduced fuel efficiency.
7. How much does it cost to fix the P0446 code on a 2018 Chevrolet Silverado?
Repair costs can vary but typically range from $150 to $300, depending on whether the vent valve, hoses, or other components need replacement.
8. How do you reset the P0446 code on a 2018 Chevy Silverado?
After addressing the issue, the code can be reset using an OBDII scanner. However, it’s important to verify the repair by driving the vehicle and ensuring the code does not return.
9. Can extreme weather conditions cause the P0446 code in a 2018 Silverado?
Yes, extreme heat or cold can sometimes cause the EVAP vent valve to malfunction, leading to this code.
10. What happens if you ignore the P0446 code on a 2018 Chevrolet Silverado?
Ignoring the code may lead to long-term damage to the EVAP system, reduced fuel efficiency, and failure to pass an emissions test.
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