AutoCodes – GMC – P0446 2014 GMC Sierra

P0446 2014 GMC Sierra 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 2014 GMC Sierra 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.

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Code Popularity 510

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 21, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0446 2014 GMC Sierra Description

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. The Engine Control Module (ECM) commands the EVAP purge solenoid valve Open and the EVAP vent solenoid valve Closed. This allows vacuum to be applied to the EVAP system. Once a calibrated vacuum level has been reached, the ECM commands the EVAP purge solenoid valve Closed and the EVAP vent solenoid valve Open. The ECM monitors the Fuel Tank Pressure (FTP) sensor for a decrease in vacuum. If the vacuum does not decrease to near 0 in H2O in a calibrated time, this DTC sets.

OBDII Code P0446 2014 GMC Sierra - Evaporative Emission Vent System Performance - AutoCodes.com — P0446 2014 GMC Sierra Code - Evaporative Emission Vent System Performance

What does this mean?

What are the Possible Causes of the DTC P0446 2014 GMC Sierra?

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 2014 GMC Sierra?

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 does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0446 2014 GMC Sierra 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 2014 GMC Sierra code?

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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 2014 GMC Sierra Code

1. What does OBDII code P0446 for a 2014 GMC Sierra indicate?

- OBDII code P0446 on a 2014 GMC Sierra relates to the Evaporative Emission Vent System Performance issue.

2. What are the common symptoms of a P0446 code in a GMC Sierra?

- Common symptoms of a P0446 code in a GMC Sierra include the check engine light coming on, a noticeable fuel smell, and possible problems filling the gas tank.

3. What are the possible causes of a P0446 code in a 2014 GMC Sierra?

- Possible causes of a P0446 code in a 2014 GMC Sierra include a faulty vent valve, a clogged vent filter, damaged hoses, or issues with the fuel cap.

4. How serious is a P0446 code on a 2014 GMC Sierra?

- While a P0446 code may not cause immediate drivability issues, it can lead to increased emissions and potentially affect the vehicle's overall performance.

5. Can I continue driving my 2014 GMC Sierra with a P0446 code?

- It is generally safe to drive your 2014 GMC Sierra with a P0446 code, but it is recommended to address the issue promptly to prevent further damage and ensure proper emissions control.

6. How can I diagnose a P0446 code in my 2014 GMC Sierra?

- Diagnosing a P0446 code in a 2014 GMC Sierra involves checking the vent valve, inspecting the vent filter and hoses, testing the fuel cap, and verifying the electrical connections.

7. What are some repair tips for fixing a P0446 code in a 2014 GMC Sierra?

- Repair tips for addressing a P0446 code in a 2014 GMC Sierra include replacing the vent valve, cleaning or replacing the vent filter, checking and repairing any damaged hoses, and ensuring the fuel cap is tightened properly.

8. Can I reset the check engine light after fixing a P0446 code on my GMC Sierra?

- After fixing a P0446 code on your GMC Sierra, you can reset the check engine light using an OBDII scanner to clear the stored error code.

9. How much does it typically cost to repair a P0446 code in a 2014 GMC Sierra?

- The cost to repair a P0446 code in a 2014 GMC Sierra can vary depending on the specific issue, but it may range from $100 to $300 for parts and labor.

10. How often does a P0446 code reoccur in a 2014 GMC Sierra after being fixed?

- If the underlying issue causing the P0446 code is properly addressed and repaired, it should not reoccur frequently in a 2014 GMC Sierra. Regular maintenance and inspections can help prevent its recurrence.