Question about GMC Denali
This type of truck did have problems with the EVAP (evaporative emissions system) vent solenoid. There is a totally new vent solenoid available with a new tube and needs to be relocated. The main problem with the old vent solenoid is it would get water in the system, and quite often freeze, thus cracking the housing, or the water would simply seize the actuator in the vent solenoid. Its not likely related to the battery being low, but more to the cold temperature. I would clear the code, if possible, and wait to see if it returns. If it comes on immediately then I would suspect the vent solenoid is damaged and will need replacement. Code P0449 is most common.
Posted on Mar 20, 2011
P0440 small leak in evap system . The battery problem likely had nothing to do with the code . The fuel level in the tank and cold weather could of set the code off . The fuel tank is pressurized when the vehicle is running but cold lowers the pressure in this type of system like tires .you could try checking the gas cap granted it could be a split hose or a bad vent soleniod or canaster . But if this is the first time for this problem its likely something simple So clear the code and wait to see what happens before you start replaceing compounts and changeing things that may be easly detcited by lossening the cap to see if you have pressure in the tank when warm
Posted on Mar 20, 2011
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Posted on Jan 02, 2017
Tips for a great answer:
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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