Question about 2006 Chevrolet Silverado 1500 2WD

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Codes P0449+P0455 have shown up on my 2006 Chevy 1/2 ton pickup. Have changed fuel cap, what next? Have cheked lines , under the truck, no wires unhooked, or hoses cracked, that I can visually see.

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6ya6ya
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Posted on Jan 02, 2017

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outdoorsman5
  • 631 Answers

SOURCE: We hooked up an OBD11 Auto Scanner to our 2005

P0449 has to do with the Evap System. The problem could be with wiring short circuit, Could be the EVAP canister purge valve or the ECM.
P0455 has to do with the evap system as well. Could be a leak in one of the hoses to the evap system so you need to check all lines to the evap system. There is also one hose that connects to the top of the tank that we have seen come loose. Could also be a intake leak or a problem with the Canister purge valve. You can fix these yourself somewhat. I would trace down all the lines first to see if anything has come loose under the vehicle to the Black plastic EVAP canisters. Without being able to check the valves you will probably have to take it to a shop to have them checked out or pay the price to replace the valves and gamble they are the problem.

Posted on Sep 29, 2009

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  • 262 Answers

SOURCE: Getting codes P0455 and P0449. From what I read,

The vent solenoid valve has been redesigned to correct the problem you are having. I would recommend purchasing the dealer component.
I am not aware of any aftermarket parts suppliers.

Posted on Feb 25, 2010

techbuster
  • 5081 Answers

SOURCE: My 2005 Tahoe has engine light codes P0449 &

The PCM has determined that a malfunction exists in the electrical circuit for the vent valve/solenoid in the evaporative emission control system.


Probable Causes
1- Purge or vent solenoids defective
2- Check connevtor and wiring
3- Fuel saturated vapor canister
4- Failed EVAP vent solenoid

Posted on Aug 24, 2010

czaa
  • 4536 Answers

SOURCE: What are codes P0455 and P0449 ?

evaporative emissions control-has to do with the fumes from the tank-may effect function of vehicle but not a major thing-its for clean air--buy a haynes book car repair and all the codes

Posted on Dec 16, 2010

jsmes1027
  • 749 Answers

SOURCE: I have a 2006 Chevy Tahoe...codes reported are

There may be an emissions leak but a very common issue is the canister vent valve. Make sure if you contact your local dealership that you have your vehicles vin number available.

  • P0449 - Evaporative Emission (EVAP) Vent Solenoid Control Circuit
  • P0455 - Evaporative Emission (EVAP) System Leak Detected
  • Posted on Dec 28, 2010

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    What are the probable causes of DTC P0449?


    P0449 - OBD-Codes.com

    www.obd-codes.com/p0449
    Detailed information on diagnosing and repairing a P0449 DTC code which refers ...P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit ... OBD-IITrouble Code Technical Description ... 2004 Chevrolet Tahoe 4.8L p0449

    EVAP Code P0449 - YouTube

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    Quick Easy Fix P0449 P0455 Evap Codes on Chevy Silverado 2007 .... Well clearing the error codes at auto store will not prevent it come ...

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    Jan 07, 2016 | 2004 Chevrolet Chevrolet Impala

    1 Answer

    2005 chevy 1500 silverado eng. light on ran code p0455 and p0449 how to fix the problem. and how much work it takes. thanks STEVE.


    P0449 is the evap vent valve solenoid circuit malfuntion.
    P0455 is an evap gross leak
    Perhaps the gross leak code has to do with the vent valve. Find the vent valve. It should be near a rectangle evap canister. Maybe under the bed. The small vent line from the fuel tank will go to it. The solenoid is near the cansiter. With the key off the valve will be open. With the key on it should be closed. You may try disconnection the hose and blow through it with both key off and on and see if air will pass through. If the valve has died and is stuck open, that can be the huge leak.

    If it is not the leak then a smoke machine should be used. Easier than searching the lines for bad o-rings, splits, or whatevers.

    Sep 02, 2011 | 2005 Chevrolet Silverado 1500 2WD

    2 Answers

    2006 Ford Fusion 2.3L I4 Engine Check engine light ODBC code is P0455. I have already replaced the gas cap. The computer codes were cleared by disconnecting the battery. The check engine light and same...


    If you have already replaced the gas cap then you need to start looking for splits in your evap lines, and the evap canister for your vehicle. This procedure is easier done at a shop then by the DYI due to how many different lines that you have, and you may have a small slice in a line that only opens up under certain conditions. The p0455 is a very difficult code to diagnosis

    Jun 06, 2011 | 2006 Ford Fusion

    2 Answers

    P0449 and P0455 error code 2008 2wd gmc envoy 30,203 miles


    P0449 - Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction

    P0455 - Evaporative Emission Control System Leak Detected (no purge flow or large leak)

    Both are refer at EVAP system; other EVAP DTCs: P0440 - P0441 - P0442 - P0443 - P0446 - P0453 - P0455 - P0456

    This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

    Symptoms: You likely won't notice any drivability problems.
    Causes: most likely means one or more of the following has happened:
    A loose or improperly affixed gas cap
    A non-conforming gas cap (i.e. not factory/original brand)
    Other leak or damaged piece in EVAP system

    Possible Solutions: the most common repair is to:
    Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
    Otherwise, replace the gas cap, and/or
    Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary


    Hope helps.

    Apr 23, 2011 | 2008 GMC Envoy

    2 Answers

    I have a 2006 Chevy Tahoe...codes reported are P0449 and P0455....replaced fuel cap but did not solve problem....what are my next steps without spending tons of money at a dealership? Thanks


    There may be an emissions leak but a very common issue is the canister vent valve. Make sure if you contact your local dealership that you have your vehicles vin number available.
  • P0449 - Evaporative Emission (EVAP) Vent Solenoid Control Circuit
  • P0455 - Evaporative Emission (EVAP) System Leak Detected
  • Dec 28, 2010 | 2006 Chevrolet Tahoe

    3 Answers

    My check engine light is on and I am getting codes P0449 and P0455. What is this and how do i fix it?


    The p0455 is for a leak concern and if that was the only code I'd say give the cap a shot. However the p0455 is most likely just a side effect of the P0449. The P0449 is a test that is run on the vent solenoid circuit to check the electrical functions in basic terms. The computer is putting out voltage amount X and in a properly functioning circuit it knows it will see voltage amount Y come back. It isn't coming back as what it expects to come back at so there must be something electrically wrong with the vent circuit. And of course if the vent doesn't work you get a large leak. If we are just throwing parts at trucks the logical one for you is a vent valve. Since your Vue is a 2008, most likely there is a good chance that it's covered under the emission warranty which is 5 years.
    Thank you for using fixya. and be safe.

    Jul 07, 2010 | 2008 Saturn VUE

    1 Answer

    2002 chevy blazer codes 443 449 i replaced the maf sensor the vaf sensor on air horn the emmision valve on the engine the vent valve to even tried the gas cap clear codes drove the truck guess what codes...


    p0443 is evaporative emission control system, purge control curcuit malfunction, p0449 is emission control system, vent control curcuit malfunction. p0449 is often a filler cap problem on fuel tank. try tightening cap

    May 20, 2010 | 2002 Chevrolet Blazer

    1 Answer

    K2500 chevy 3/4 ton pick up. no power under load


    IN your distributer under the rotor is a magnet and a pickup coil (the magnet is known as a pole piece) check your pickup coil for corrsion (green in color) and the module and also check pole piece for cracks in the magnet where the rivets hold it together. sometimes oil wicks up around the distributer shaft because of housing wear or the pieces just wear out over time.

    May 16, 2010 | 1999 Chevrolet K2500

    2 Answers

    Getting codes P0455 and P0449. From what I read,


    The vent solenoid valve has been redesigned to correct the problem you are having. I would recommend purchasing the dealer component.
    I am not aware of any aftermarket parts suppliers.

    Feb 25, 2010 | 2005 Chevrolet Avalanche

    1 Answer

    We hooked up an OBD11 Auto Scanner to our 2005 Chevy Silverado 1500 pickup and got the codes P0449 and P0455 What do they mean and can we fix it ourselves or do we have to take it in.


    P0449 has to do with the Evap System. The problem could be with wiring short circuit, Could be the EVAP canister purge valve or the ECM.
    P0455 has to do with the evap system as well. Could be a leak in one of the hoses to the evap system so you need to check all lines to the evap system. There is also one hose that connects to the top of the tank that we have seen come loose. Could also be a intake leak or a problem with the Canister purge valve. You can fix these yourself somewhat. I would trace down all the lines first to see if anything has come loose under the vehicle to the Black plastic EVAP canisters. Without being able to check the valves you will probably have to take it to a shop to have them checked out or pay the price to replace the valves and gamble they are the problem.

    Sep 29, 2009 | 2005 Chevrolet Silverado 1500 2WD

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