Question about 2000 Chevrolet Silverado 1500

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PO 449 Evaporotive Emissions Vent Valve Solenoid

What is the usual cause of this DTC?

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  • johnnyw2113 Mar 27, 2009

    The truck was fine and then one day it began to run very rough. i had my repair guy check it out and he says the problem is a sensor thats located between the air filter and the intake manifold. the part has the word DEpass thjis unitLPHI written on it. This part is 200 dollars and it has happened several times to my friends truck. is there anyway to by-pass this?????

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FUEL VENT VALVE FOR 2001 CHEV TRUCK

Posted on Mar 28, 2009

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  • bluegrass309 Mar 28, 2009

    WHERE IS THE VENT VALVE LOCLATED ON THIS TRUCK

  • bluegrass309 Mar 28, 2009

    HOW TO FIND THIS ON THIS TRUCK

  • bluegrass309 Mar 28, 2009

    SOLVE THIS PROBLEM

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It can be anything from your gas cap to the fuel pump vent solenoid there is also a charcoal canister that may have a bad hose or relay on it

Posted on Mar 08, 2009

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2007. What are the probable causes of DTC P0446?


DTC P0446: Evaporative Emissions (EVAP) Vent System Performance
Circuit/System Description
This DTC tests the evaporative emission (EVAP) system for a restricted or blocked EVAP vent path. The control module commands the EVAP canister purge solenoid valve Open and the EVAP canister vent solenoid valve Closed. This allows vacuum to be applied to the EVAP system. Once a calibrated vacuum level has been reached, the control module commands the EVAP canister purge solenoid valve Closed and the EVAP canister vent solenoid valve Open. The control module monitors the fuel tank pressure (FTP) sensor for a decrease in vacuum. If the vacuum does not decrease to near 0 inch H2O in a calibrated time, this DTC sets.
Diagnostic Aids
?€¢
An intermittent condition could be caused by a damaged EVAP vent housing, a temporary blockage at the EVAP canister vent solenoid valve inlet, or a pinched vent hose. A blockage in the vent system will also cause a poor fuel fill problem.


?€¢
An EVAP canister, vent hose, or vent solenoid valve that has restricted flow may cause this DTC to set. Using a purge solenoid command with a scan tool will allow vacuum to be applied to the system instead of pressure. With the engine running, the EVAP canister vent solenoid valve open, and the EVAP canister purge solenoid valve commanded to 100 percent, the fuel tank vacuum should not increase to more than 5 inches H2O.


?€¢
An EVAP canister filter that is restricted can cause this DTC to set. Refer to Evaporative Emission Canister Replacement .


?€¢
Disconnecting one component at a time while the EVAP system is under flow will help to pinpoint a restriction in the system


Do you have a scan tool that reads data PID'S ?
Your FTP - fuel tank pressure sensor could be at fault !

    Ignition ON and fuel cap removed, verify that the FTP sensor parameter is between 1.3-1.7 volts. ?‡'
    If not within the specified range, go to the FTP sensor section in Circuit/System Testing.

  1. Install the fuel cap.
  2. With the engine running, the EVAP canister vent solenoid valve open, and the EVAP canister purge solenoid valve commanded to 100 percent, the fuel tank vacuum should not increase to more than 12 inches H2O.
?‡'
If the fuel tank vacuum is greater than the specified range, go to the restriction section in Circuit/System Testing.



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Sep 06, 2015 | Chevrolet Impala Cars & Trucks

1 Answer

GMC Canyon problem DTC P0449


Code 449 is for a problem with the EVAP system vent valve solenoid circuit.
The solenoid may not be reacting to computer commands to open or close.
The solenoid and circuit would need to be tested.

Feb 19, 2013 | 2005 GMC Canyon

1 Answer

I received the following code for a 2006 Saturn Ion with a 2.4 Litre motor P0446 what is is and how do I fix it?


Trouble Code: P0446

Evaporative Emissions (EVAP) Vent System Performance

Possible Causes:


The EVAP system tests run when the engine is first started and meets the Conditions for Running the DTC. An intermittent condition could be caused by a damaged EVAP vent housing, a temporary blockage at the EVAP canister vent inlet, or a pinched vent hose. A blockage in the vent system will also cause a poor fuel fill condition.An EVAP canister, vent hose, or vent solenoid valve that has restricted flow may cause this DTC to set. Using a purge solenoid command with a scan tool will allow vacuum to be applied to the system instead of pressure. With the engine running, the EVAP canister vent solenoid valve open and the EVAP canister purge solenoid valve commanded to 100 percent, the fuel tank vacuum should not increase to more than 5 inches H2O.An EVAP canister filter that is restricted can cause this DTC to set. Refer to Evaporative Emission (EVAP) Canister Filter Replacement and Evaporative Emission (EVAP) System Cleaning .Disconnecting one component at a time while the EVAP system is under flow will help to pinpoint a restriction in the system.Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.For intermittent conditions, refer to Intermittent Conditions .

Dec 29, 2012 | 2006 Saturn ION

1 Answer

Trouble codes po443 and po449


PO 443--Evap Purge Control Valve Circuit

PO 449---Same thing---Vent Valve/Solenoid
Circuit Malfunction

Dec 04, 2012 | 2001 Pontiac Grand Am SE

1 Answer

Setting a po 449 code


This is for a defective Evaporator vent valve solenoid. It should be close to the canister on most cars, but your car is configured for high water crossings so it may be mounted higher.

You can probably buy one at Autozone,or another aftermarket parts store. There is usually very little to changing one of these.

Apr 07, 2012 | 2006 Hummer H3

1 Answer

The engine light came on and when tested a code of PO 449 Evap. vent emission control came up. What is this?


DTC P0449 - Evaporative Emission Control System Vent Valve/ Solenoid Circuit Malfunction
The most likely problem is the evap vent solenoid which is mounted under the truck back by the fuel tank. The code is related to the circuit to the solenoid. Most likely the solenoid is shorted or Open which is causing the code to set. The other things to check if the solenoid is not the problem is the wiring to the solenoid could be corroded or broken or damaged. The last thing to suspect is the pcm which is the computer that runs the system. It could have a faulty driver inside, but I would suspect the solenoid or wiring first.

There is a bulletin for the vent solenoids getting dirt or road debris inside of them so when you go to get your solenoid, you may get a kit that will require you to relocate the solenoid and add a section of heater hose and a new inlet which you will need to mount around the passenger side of the trans. This keeps road debris and dirt from getting into the solenoid.

Check Diagnostis Information Procedure.

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Nov 02, 2011 | 2006 Chevrolet Silverado

1 Answer

Gives me a code po 449 evap.vent emission control what is this?


DTC P0449 - Evaporative Emission Control System Vent Valve/ Solenoid Circuit Malfunction
The most likely problem is the evap vent solenoid which is mounted under the truck back by the fuel tank. The code is related to the circuit to the solenoid. Most likely the solenoid is shorted or Open which is causing the code to set. The other things to check if the solenoid is not the problem is the wiring to the solenoid could be corroded or broken or damaged. The last thing to suspect is the pcm which is the computer that runs the system. It could have a faulty driver inside, but I would suspect the solenoid or wiring first.

There is a bulletin for the vent solenoids getting dirt or road debris inside of them so when you go to get your solenoid, you may get a kit that will require you to relocate the solenoid and add a section of heater hose and a new inlet which you will need to mount around the passenger side of the trans. This keeps road debris and dirt from getting into the solenoid.

Check Diagnostis Information Procedure.

Hope this helps and just keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa.

Nov 02, 2011 | Cars & Trucks

1 Answer

Po 442 po 455


P0442 - Evaporative Emissions System Leak Detected (Small Leak)

P0455 - Evaporative Emissions System Leak Detected (Gross Leak)

This diagnosis detects leaks in the EVAP purge line using engine intake manifold vacuum. If pressure does not increase, the ECM will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition. The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.

Causes:
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Incorrect fuel tank vacuum relief valve
- Leak is in line between intake manifold

Solutions:
- Re-tighten or replace fuel tank filler cap
- Replace damaged or leaking EVAP canister
- Replace damaged or leaking lines.

Feb 10, 2011 | Chrysler Town and Country Cars & Trucks

1 Answer

Codes PO 442, 449 and 455


Check all vacuum lines from the gas tank to the evaporative charcoal cannister by the gas tank and to the purge valve located at the engine. Check the electrical connector at the vent solenoid which should be located on the charcoal cannister and purge valve solenoid by the intake manifold.

Jun 10, 2009 | 2003 Chevrolet Silverado 1500

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