P0449 Code - GMC Acadia, Sierra

Main Navigation

Advertisement
Social Connect
Resources
Our Brand Family
UnderhoodService
Technical resources to help diagnose and repair engine-related service issues.
Emissions

GMC Tech Tip: EVAP Vent Solenoid Replacement (P0449)

Check engine light is illuminated with code P0449 from scan tool (Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction).

Underhood Service Staff Writers
By Underhood Service Staff Writers
obdii port diagnostics featured

Model: 2009 GMC Sierra

Related Articles

Complaint

Check engine light is illuminated with code P0449 from scan tool (Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction).

Situation

  • The solenoid does not respond to scan tool command.
  • The solenoid has power to A-terminal red wire.
  • Test light between terminals A and B does not light.
  • EVAP vent solenoid was replaced along with white wire from PCM to solenoid; code still appears.
  • Gas cap seals properly.
  • New wire does not allow test light to illuminate.

Solution

Test for a ground signal at the PCM on the white wire while activating the solenoid. If a ground signal is present, the wire has a break in it and needs replaced. If the signal is not present, the PCM module is faulty and needs replaced.

Courtesy of Mitchell1 SureTrack Real Fix.

You May Also Like

Emissions

E-15 Ethanol Damage to Fuel Pumps

One of the problems with ethanol is how it reacts to water in the air and in the tank.

Andrew Markel
By Andrew Markel

In the next few months, you will be hearing a lot about E-15 summer-blend fuels making their way to gas pumps across the country. E-15 uses more ethanol in its blend to reduce our dependence on fossil fuels. No matter your political view, you must wonder what this means for engines.

Read Full Article

More Emissions Posts
Oxygen Sensor Questions Answered

If an O2 sensor is not reading properly or is borderline, it should be replaced regardless of its age or mileage.

By Andrew Markel
Managing (DPF) Diesel Particulate Filter Regeneration Cycles

The DPF is designed to store the soot and ash, to later burn them off during a regeneration cycle.

By Josh Troche
Ultimate Underhood – Gasoline Particulate Filters

Just like a DPF, a gasoline particulate filter (GPF) traps and stores soot particles in the exhaust stream.

By Underhood Service Staff Writers
Why O2 Sensors Fail To Calculate Exhaust Levels Over Time

As miles accumulate, O2 sensors effectively “catch a cold,” meaning they can’t breathe like they should.

By Gary Goms

Other Posts

EVAP Codes and Fuel Pumps (VIDEO)

Here are three tips can help you avoid having to drop the fuel tank for a second time. Sponsored by Carter Fuel Systems.

By Joe Keene
Perform OE-Level Analysis With New Diagnostic Tool

Bluetooth-enabled device automatically identifies make, model and year match software.

By Underhood Service Staff Writers
EVAP Test Late-Model Vehicles with Redline Detection EasyConnect

Technicians can snap the adapters into an easily accessible line, then connect their smoke machine to the EVAP system.

By Underhood Service Staff Writers
Clearing The Air About Diesel Exhaust Fluid (DEF)

Reducing emissions to acceptable levels is achieved through a four-stage process.

By Brendan Baker