Question about 2005 Chevrolet Avalanche
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Posted on Jan 02, 2017
SOURCE: I have 2 codes going
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:
With a P0442, the most common repair is to:
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
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 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.
Put unused material on shelf for future use.
Part Number Description Qty Material Allowance
Solenoid Kit, EVAP Emission
Canister Vent Valve
Solenoid Kit, EVAP Emission
Canister Vent Valve
9438383 (5/8" X 25'
$10.80 USD ($22.59
12337820 (10 per
Tie-Strap 5 $3.80 USD ($4.55 CAD)
15620999 (10 per
$3.78 USD ($7.08 CAD)
$7.56 USD ($14.17 CAD)
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Posted on Feb 17, 2011
SOURCE: I have a service engine
vent solenoid is that open or close the air to engine when you stop engine in emergency this solenoid close the air to engine. so you have to check the air flap.
Posted on Sep 01, 2011
you see code po441 the purge solenoid could be faulty or disconnected. if you have problem with evap switch to vent solenoid you would smell gas fumes in vechicle.check make sure gas cap on tight not leaking because it will set off code po441.
Posted on Feb 07, 2012
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An EVAP canister, vent hose, or vent solenoid valve that has restricted flow may cause this DTC to set. Using a purge solenoid command with a scan tool will allow vacuum to be applied to the system instead of pressure. With the engine running, the EVAP canister vent solenoid valve open, and the EVAP canister purge solenoid valve commanded to 100 percent, the fuel tank vacuum should not increase to more than 5 inches H2O.
An EVAP canister filter that is restricted can cause this DTC to set. Refer to Evaporative Emission Canister Replacement .
Disconnecting one component at a time while the EVAP system is under flow will help to pinpoint a restriction in the system
Do you have a scan tool that reads data PID'S ?
Your FTP - fuel tank pressure sensor could be at fault !
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