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Subject: 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).






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.



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






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.


Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

Remove the bolt retaining the vent valve bracket.

Disconnect the electrical connector.

Disconnect the canister vent valve hose.

Install the new vent valve bracket, P/N 15105605, to the vehicle with the retaining bolt.


Tighten the bracket mounting bolt to 12 N·m (106 lb in).


Install the new vent valve, P/N 10382105, to the bracket.

Reinstall the electrical connector.

Reinstall the canister vent valve hose.

Lower the vehicle.

Clear the DTC.

Parts Information

Part Number





Bracket, EVAP Emission Canister Purge




Valve, EVAP Emission Canister Control


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Can anyone help me identify the location of the EVAP Emission Canister Control Valve & brkt to help aid me to hopefully make the replacement go a bit easier? Any helpful tips for R&R would be greatly appreciated as well. BTW: The vehicle is a 2001 Suburban 5.3L 1500 4X4.


Thanks much!


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