AutoCodes – GMC – P0449 2017 GMC Sierra

P0449 2017 GMC Sierra Code - Evaporative Emission Vent Solenoid Valve Control Circuit

Quick Answer

The Evaporative Emission (EVAP) Vent Solenoid Valve is located on the EVAP canister and is used to seal the canister vent. Common causes include Faulty Evaporative Emission Vent Solenoid Valve, Evaporative Emission Vent Solenoid Valve harness is open or shorted, Evaporative Emission Vent Solenoid Valve electrical circuit poor connection. 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: P0449 2017 GMC Sierra indicates Evaporative Emission Vent Solenoid Valve Control Circuit.
Common causes: Common causes include Faulty Evaporative Emission Vent Solenoid Valve, Evaporative Emission Vent Solenoid Valve harness is open or shorted, Evaporative Emission Vent Solenoid Valve electrical circuit poor connection.
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 362

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 Jun 27, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
Comments
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Code P0449 2017 GMC Sierra Description

The Evaporative Emission (EVAP) Vent Solenoid Valve is located on the EVAP canister and is used to seal the canister vent. The Evaporative Emission Vent Solenoid Valve responds to signals from the Engine Control Module (ECM). Battery voltage is supplied to the EVAP vent solenoid valve through a fuse. The ECM grounds the EVAP Vent Solenoid Valve control circuit through an internal switch called a driver. A plunger will then move to seal the canister vent. The ability to seal the vent is necessary for the on board diagnosis of other evaporative emission control system components. The ECM monitors the status of the driver. A scan tool will display the commanded state of the EVAP Vent Solenoid Valve as Not Venting (On) or Venting (Off). The Diagnostic Trouble Code (DTC) will be set when the ECM detects the EVAP vent solenoid valve control circuit is open within 0.25 s.

OBDII Code P0449 2017 GMC Sierra - Evaporative Emission Vent Solenoid Valve Control Circuit - AutoCodes.com — P0449 2017 GMC Sierra Code - Evaporative Emission Vent Solenoid Valve Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0449 2017 GMC Sierra?

Faulty Evaporative Emission Vent Solenoid Valve
Evaporative Emission Vent Solenoid Valve harness is open or shorted
Evaporative Emission Vent Solenoid Valve electrical circuit poor connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0449 2017 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

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0449 2017 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.

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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.