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  • zaken1 06/10/12 2:45 am PST

    Has the dealer checked for a factory service bulletin about this problem? It looks like they didn't. Chevy has issued bulletin #2101090, which addresses the recommended fix for this problem:

    Document ID: 2101090
    Page 1 of 8
    2005 Chevrolet Chevy K Silverado - 4WD
    |
    Sierra, Silverado (VIN C/K) Service Manual
    | Document ID: 2101090
    #02-06-04-037D: DTC P0446 (Restricted/Blocked Evap
    Vent Path) Set, Check Engine Light On (Replace
    Evaporative Emission (EVAP) Vent Valve Solenoid
    Assembly and Add/Relocate Filter Box Using Service
    Kit) - (Apr 16, 2008)
    Subject: DTC P0446 (Restricted/Blocked EVAP Vent Path) Set, Check
    Engine Light On (Replace Evaporative Emission (EVAP) Vent
    Valve Solenoid Assembly and Add/Relocate Filter Box Using
    Service Kit)
    Models: 1999-2007 Chevrolet Silverado (Classic) Models
    1999-2007 GMC Sierra (Classic) Models
    2007-2008 Chevrolet Silverado Models
    2007-2008 GMC Sierra Models
    This bulletin is being revised to add new style pickups to the models and update the
    correction information to include a new location for the filter box. Please discard
    Corporate Bulletin Number 02-06-04-037C (Section 06 -- Engine/Propulsion System).
    Condition
    Some customers whose vehicles are operated in dusty type environments, such as farming or
    mining off-road type applications, may comment about the illumination of the check engine light,
    with a DTC of P0446 (Restricted/Blocked EVAP Vent Path) being set.
    Cause
    Dirt and dust intrusion into the EVAP canister vent hose assembly, resulting in restricted air flow,
    may cause this condition.
    Correction (1999-2007 Classic/Old Style Models)
    After following the published SI diagnostics for P0446 and determining that the EVAP canister vent
    valve is the cause of the MIL light, replace the existing EVAP canister vent valve assembly with a
    new assembly. This new assembly is a sealed unit that is designed to be vented through a remote
    filter box. To ensure correct installation, follow the procedures below.
    1999-2003 Model Year (Use Service Kit P/N 19152345)
    © 2009 General Motors Corporation. All rights reserved.
    http://gsi.xw.gm.com/si/showDoc.do?docS
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    Document ID: 2101090
    Page 2 of 8
    1. Raise the vehicle. Suitably support the vehicle.
    2. Disconnect the EVAP canister vent valve electrical connector, if equipped.
    3. Disengage the two vent valve pipe clips securing the pipe to the underbody. Remove the clips
    from the underbody and discard.
    4. Disconnect the vent valve pipe at the EVAP canister.
    5. Remove and retain the EVAP canister vent valve bracket mounting bolt.
    6. Remove the complete EVAP canister vent valve assembly with bracket attached and discard.
    Important: The new canister vent valve will be installed in a new location, outside of the
    frame.
    7. Position and secure the new valve assembly to the frame bracket on the outside of the frame
    using the existing hole and mounting bolt.
    Tighten
    Tighten the bracket mounting bolt to 12 N m (106 lb in).
    8.
    9.
    10.
    11.
    Connect the vent valve pipe to the EVAP canister.
    Install the two vent valve pipe clips into the existing underbody holes.
    Connect the EVAP canister vent valve electrical connector, if equipped.
    Attach bulk 5/8" heater hose to the vent valve port and secure using a clamp. Run a length
    as needed along the frame rail routing to the area above the transmission.
    12. Cut the hose to determined length and install the supplied filter box. Secure using a clamp.
    13. Remove the transmission support and lower the transmission assembly as necessary to allow
    for access to the new filter box location.
    http://gsi.xw.gm.com/si/showDoc.do?docS
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    Document ID: 2101090
    Page 3 of 8
    14. Secure the filter box to the transmission vent hose just forward of the hose tee-section using
    a tie strap. DO NOT pinch or restrict the transmission vent hose. The filter box opening
    should be pointing downward.
    15. Raise the transmission and reinstall the transmission support.
    16. Tie strap the hose as needed along the frame rail in order to keep the hose away from pinch-
    points and heat sources.
    17. Lower the vehicle.
    2004-2007 Model Year (Use Service Kit P/N 19152349)
    1.
    2.
    3.
    4.
    Raise the vehicle. Suitably support the vehicle.
    Disconnect the EVAP canister vent valve electrical connector.
    Disconnect the canister pipe from the vent valve.
    Push in the retainer and remove the existing canister vent valve from the fuel tank clip or
    mounting bracket. Discard the old valve.
    5. Cut back the existing canister pipe approximately 51 mm (2 in) to remove the quick connect
    end.
    Crew Cab Short Box Shown Below, Other Configurations Similar
    http://gsi.xw.gm.com/si/showDoc.do?docS
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    1/26/2009
    Document ID: 2101090
    Page 4 of 8
    Extended Cab Short Box Shown Below, Other Configurations Similar
    6. Install the new canister vent valve to the fuel tank clip or mounting bracket.
    7. Cut bulk 5/8" heater hose to a length of approximately 76 mm (3 in). Install the hose
    between the vent valve and the canister pipe and secure using clamps.
    8. Attach bulk 5/8" heater hose to the vent valve port and secure using a clamp. Run a length
    as needed along the frame rail routing to the area above the transmission.
    9. Cut the hose to determined length and install the supplied filter box. Secure using a clamp.
    10. Remove the transmission support and lower the transmission assembly as necessary to allow
    for access to the new filter box location.
    http://gsi.xw.gm.com/si/showDoc.do?docS
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    Document ID: 2101090
    Page 5 of 8
    11. Secure the filter box to the transmission vent hose just forward of the hose tee-section using
    a tie strap. DO NOT pinch or restrict the transmission vent hose. The filter box opening
    should be pointing downward.
    12. Raise the transmission and reinstall the transmission support.
    13. Connect the EVAP canister vent valve electrical connector.
    14. Tie strap the hose as needed along the frame rail in order to keep the hose away from pinch-
    points and heat sources.
    15. Lower the vehicle.
    Correction (2007-2008 New Style Models)
    After following the published SI diagnostics for P0446 and determining that the EVAP canister vent
    valve is the cause of the MIL light, replace the EVAP canister vent valve assembly and relocate the
    remote filter box. To ensure correct installation, follow the procedures below.
    Use Service Kit P/N 19152349
    1.
    2.
    3.
    4.
    Raise the vehicle. Suitably support the vehicle.
    Disconnect the EVAP canister vent valve electrical connector.
    Disconnect the vent valve pipe quick connect from the canister.
    Either cut the existing valve vent pipe and leave the remaining section of pipe in the vehicle
    or remove along with the valve.
    5. Push in the retainer and remove the existing canister vent valve from the fuel tank clip or
    mounting bracket.
    6. Cut back the existing canister pipe approximately 51 mm (2 in) and retain the pipe for use
    with new valve.
    7. Connect the canister pipe quick connect to the canister.
    2500 Crew Cab Short Box Shown Below, Other Configurations Similar
    http://gsi.xw.gm.com/si/showDoc.do?docS
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    Document ID: 2101090
    Page 6 of 8
    1500 Extended Cab Short Box Shown Below, Other Configurations
    Similar
    8. Install the new canister vent valve to the fuel tank clip or mounting bracket.
    9. Cut bulk 5/8" heater hose to a length of approximately 76 mm (3 in). Install the hose
    between the vent valve and the canister pipe and secure using clamps.
    10. Attach bulk 5/8" heater hose to the vent valve port and secure using a clamp. Run a length
    as needed along the frame rail routing to the passenger side area above the transmission.
    11. Cut the hose to determined length and install the supplied filter box. Secure using a clamp.
    12. Remove the transmission heat shield, if necessary.
    13. Remove the transmission support and lower the transmission assembly as necessary to allow
    http://gsi.xw.gm.com/si/showDoc.do?docS
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    1/26/2009
    Document ID: 2101090
    Page 7 of 8
    for access to the new filter box location.
    14. Secure the filter box to the transmission vent hose just forward of the hose tee-section using
    a tie strap. DO NOT pinch or restrict the transmission vent hose. The filter box opening
    should be pointing downward.
    15. Raise the transmission and reinstall the transmission support.
    16. Reinstall the transmission heat shield.
    17. Connect the EVAP canister vent valve electrical connector.
    18. Tie strap the hose as needed along the frame rail in order to keep the hose away from pinch-
    points and heat sources.
    19. Lower the vehicle.
    Parts Information
    Part Number Description Qty Material Allowance
    19152345 (1999-2003 Solenoid Kit, EVAP Emission 1 --
    Model Year) Canister Vent Valve
    19152349 (2004-2008 Solenoid Kit, EVAP Emission 1 --
    Model Year) Canister Vent Valve
    9438383 (5/8" X 25' Hose Cut to $10.80 USD ($22.59
    roll) Length CAD)
    12337820 (10 per Tie-Strap 5 $3.80 USD ($4.55 CAD)
    pack)
    2 (1999- $3.78 USD ($7.08 CAD)
    2003) (1999-2003)
    or or
    4 (2004- $7.56 USD ($14.17 CAD)
    2008) (2004-2008)
    15620999 (10 per
    pack)
    Clamp
    Put unused material on shelf for future use.
    http://gsi.xw.gm.com/si/showDoc.do?docS
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    1/26/2009
    Document ID: 2101090
    Page 8 of 8
    Warranty Information
    For vehicles repaired under warranty, use:
    Labor
    Operation
    J7908*
    Description
    Replace Evaporative Emission (EVAP) Vent Valve Solenoid
    Assembly and Add/Relocate Filter Box Using Service Kit
    Labor
    Time
    1.1 hrs**
    * This labor operation number is for bulletin use only. This number will not be published in
    the Labor Time Guide.
    **Diagnosis time is included in this labor time.
    GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform
    these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the
    proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how
    to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or
    that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit
    from the information.
    http://gsi.xw.gm.com/si/showDoc.do?docS
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    1/26/2009

  • terry126 06/10/12 10:00 am PST

    yes, the dealer put the relocated part on and told me the problem was fixed but about 2 days later the check engine light came back on with trouble code 446. the truck has had the new vent solenoid installed , new fuel cap ,purge valve, vent valve, pressure smoke test on lines, canister, and the check engine light still comes on

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