I HAD REPLACED VENT SELENOID AND CODE P0446 STILL CAMING BACK

SOURCE: I have 2 codes going

Hi,

P0442 - This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. 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.

You likely won't notice any drivability problems.

A code P0442 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)
• A small leak/hole in a fuel vapor hose/tube
• Other small leak in EVAP system
• Faulty vent o-ring seal

With a P0442, 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, or
• Inspect the EVAP system for cuts/holes in tubes/hoses

Gas cap and any of the hoses under the hood. Best method is to have a "smoke" test done , which will pinpoint the leak in the shortest time and can be done by most shops these days.

P0446 - There is a complete technical bulletin for the same. Read the complete instructions :-

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 N8. Connect the vent valve pipe to the EVAP canister.
9. Install the two vent valve pipe clips into the existing underbody holes.
10. Connect the EVAP canister vent valve electrical connector, if equipped.
11. 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




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 pinchpoints
and heat sources.
17. Lower the vehicle.

Parts Information
Put unused material on shelf for future use.
Part Number Description Qty Material Allowance
19152345 (1999-2003
Model Year)
Solenoid Kit, EVAP Emission
Canister Vent Valve
1 --
19152349 (2004-2008
Model Year)
Solenoid Kit, EVAP Emission
Canister Vent Valve
1 --
9438383 (5/8" X 25'
roll)
Hose
Cut to
Length
$10.80 USD ($22.59
CAD)
12337820 (10 per
pack)
Tie-Strap 5 $3.80 USD ($4.55 CAD)
15620999 (10 per
pack)
Clamp
2 (1999-
2003)
or
4 (2004-
2008)
$3.78 USD ($7.08 CAD)
(1999-2003)
or
$7.56 USD ($14.17 CAD)
(2004-2008


Let me know,if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

SOURCE: i have a p0446 code

Here it is..not too clear...best i can do...Hope this helps you ???

SOURCE: 2003 avalanche 1500. Code p0446. I changed the

The simplest (and least expensive) possible solution is to replace the gas tank filler cap. If the cap doesn't seal properly, the EVAP system cannot pull and maintain a vacuum, and the computer will throw a P0446 code. Try it and see if it doesn't solve your problem.

SOURCE: fix code p0446

HI. NOW IT NEED TO BE TURN OFF YOU CAN DO THIS BUT YOU WILL NEED A CODE READER OR TAKE TO A CAR SHOP THAY CAN DO IT FOR YOU