Just leave it go could be gas tank cap left loose when running pointless to worry about this code if car runs fine dont worry try clearing the codes at autozone for free
It could be damage to the wiring harness. These components are under the car near the fuel tank. Or, it could all be caused by a bad pressure sensor. Cannot tell you a cost without a full diagnosis, but make sure you have a good mechanic and not someone that just replaces parts.
SOURCE: P0440 Evaporative Emission Control
You need a charcoal canister and vent control valve.
You also need the EGR solenoid valve (I think it the brown one).
Valve is located in the valley of the V, towards the transmission side of engine.
Do these 1st and reset light. You may have other issues but you have to start here.
SOURCE: 2006 Cadillac escalade Codes coming up are:
most places charge an hour's labor for the diagnosis at whatever the labor rate may be. The cost will be contingent upon the actual problem and what it takes to fix it (electrical issues, parts required...) the repair could range from 300.00 to 600.00 depending on whats wrong with the system. Take a look at your gas cap make sure the o-ring isn't cracked. If its ok reinstall it maiking sure it goes on tight. Locate the vent solenoid. the vent solenoid is normally open so when you ground it it should seal. You could use a vacuum pump and apply vacuum to the vent through the hose and see if the vacuum holds if it doesn't replace the solenoid. Ground the solenoid several times and listen for it to clickif at any time it stops clicking replace it. To do this you will need the ignition on disconnect the plug and with a test light identify power and ground. Back probe the ground wire and reconnect the plug the the solenoid. Connect one end of a jumper wire on a good ground and with the other end tap the back probe several times.
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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.
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An EVAP canister filter that is restricted can cause this DTC to set. Refer to Evaporative Emission Canister Replacement .
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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 !
If
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