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Check Engine Light 03 Tahoe

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Anyone help?


FOr what its worth it happened JUST after I got the car washed. Hoped in, and the dreaded orange light is glowing.. Habla Zone said its code 0446


P0446....Evaporative Emission Control System Vent Control Circuit


I got nothing :lol:

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999999995.gifSubject:LR4, LM4, LM7, L59, LQ9, LQ4, L18 DTC P0446 (Restricted/Blocked EVAP Vent Path) Set, Service Engine Soon (SES) Lamp Illuminated (Replace Vent Solenoid and Bracket) #04-06-04-055A - (03/20/2006)







Models:2000-2003 Cadillac Escalade



2002-2003 Cadillac Escalade EXT



2003 Cadillac Escalade ESV



2000-2003 Chevrolet Suburban, Tahoe



2002-2003 Chevrolet Avalanche



2000- 2003 GMC Yukon, Yukon XL



with 4.8L, 5.3L, 6.0L, 8.1L Vortec™ V8 Engine (VINs V, P, T, Z, N, U, G -- RPOs LR4, LM4, LM7, L59, LQ9, LQ4, L18)





This bulletin is being revised to add updated warranty information and enhance the content. Please discard Corporate Bulletin Number 04-06-04-055 (Section 06 -- Engine/Propulsion System).


<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1791752&psdid=304&evc=sm#ss1-1791752">


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 instrument panel SES light, with a DTC of P0446 (Restricted/Blocked EVAP Vent Path) being set.


<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1791752&psdid=304&evc=sm#ss2-1791752">


Dirt and dust intrusion into the EVAP canister vent solenoid, resulting in restricted air flow, may cause this condition.


<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1791752&psdid=304&evc=sm#ss3-1791752">






Replace the EVAP vent solenoid with a more robust vent solenoid.


DO NOT Replace the EVAP canister or other EVAP parts.


After following the Service Manual diagnostic P0446 and determining that the EVAP canister vent valve is the cause of the SES light, replace the existing EVAP canister vent solenoid and bracket. This new vent solenoid has an enhanced filtering capability and a filter element that can be easily removed and cleaned. To ensure correct installation, follow the procedure below.


  1. <LI type=1>Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information. <LI type=1>Remove the bolt retaining the vent valve bracket. <LI type=1>Disconnect the electrical connector. <LI type=1>Disconnect the canister vent valve hose. <LI type=1>Install the new vent valve bracket, P/N 15105605, to the vehicle with the retaining bolt. Tighten
    Tighten the bracket mounting bolt to 12 N·m (106 lb in).
    <LI type=1>Install the new vent valve, P/N 10382105, to the bracket. <LI type=1>Reinstall the electrical connector. <LI type=1>Reinstall the canister vent valve hose. <LI type=1>Lower the vehicle.
  2. Clear the DTC.

<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1791752&psdid=304&evc=sm#ss4-1791752">

Parts Information

Part Number








Bracket, EVAP Emission Canister Purge






Valve, EVAP Emission Canister Control




<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1791752&psdid=304&evc=sm#ss5-1791752">

Warranty Information

For vehicles repaired under warranty, use:


Labor Operation




Labor Time




Valve, Evaporative Emission Canister Vent Solenoid and Bracket - Replace


Use Published Labor Operation 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.


© Copyright General Motors Corporation. All Rights Reserved.



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humm- thanks!


As of right now, I pulled the ground batt cable and its gone - we'll see if it lasts.. Otherwise i'll replace the valve

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Probably a fluke about the car wash. Some codes like missfire codes and critical stuff like mass air flow and coolant temp are constantly checked. The evap systems test only runs under certian conditions and may not run for over a month. Good luck with the reset maybe you get lucky and it doesn't come back on.

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