I have changed the charcoal canister..crankshaft sensor..camshaft sensor....evap canister purge selenoid..vapor canister selonoid...and my 2005 chevy tahoe will start and run good and after 20 minutes it turns off and won't turn on..I also got a new battery. Thank you

charcoal filter ????? Charcoal canister - evaporative emission system . Stores fuel vapors till the engine PCM - computer energizes the purge solenoid to draw vapors into the engine to be burned . How to Test and Repalce an EVAP Canister HD

Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
Chevrolet

All modern cars are equipped with an Evaporative Emission Control (EVAP)
system. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects and temporarily stores the fuel vapors in the charcoal canister. The charcoal canister is filled with activated carbon pellets that can absorb the fuel vapors. When the engine is running, the fuel vapors are purged from the canister and burned in the engine.


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DTC P0449: Evaporative Emission (EVAP) Vent Solenoid Control Circuit , your vent solenoid is opened or the wiring circuit is . The vent solenoid is by the charcoal canister at the gas tank .
P0449 Battery voltage is supplied to the EVAP canister vent solenoid valve. The control module grounds the EVAP canister vent solenoid valve control circuit to close the valve by means of an internal switch called a driver. The scan tool displays the commanded state of the EVAP canister vent solenoid valve as ON or OFF. The control module monitors the status of the driver.

older nissan? evap canister purge fault. check for loose or rotten/disconnected vacuum hoses before testing the vapor canister purge valve.
The charcoal canisters also clog up. Do some diagnosing before you go changing parts.

The canister purge valve is a computer controlled solenoid valve that allows any stored fuel vapors in the charcoal canister to be recycled back into the engine combustion process. The valve is typically located on or near the throttle body. The canister purge valve is controlled by the power train control module (PCM). The canister purge valve is closed each time the power train computer runs the OBD-II (Onboard Diagnostic Generation II) EVAP monitoring self-test.--------------------------------------------------------------------------------
renault can clip

This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. 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.

EVAP emission canister purge is contolled by a valve which allows engine vacuum to pull stored fuel vapors from fuel tank into the engine to be burned, rather than be vented to atmosphere. A vacuum switch is used to detect when flow exists. If the PCM commands purge and sees that the switch is closed (indicating no detected purge flow) P0441 is set.

Symptoms: Likely, no symptoms will be discernible to the driver, other than the illuminated Check Engine Light.

Causes: A code P0441 could mean one or more of the following has happened:
Bad vacuum switch
Broken or damaged EVAP line or canister
Open in PCM purge command circuit
Open or short in Voltage feed circuit to Purge Solenoid
Faulty purge solenoid
Restriction in EVAP solenoid, line or canister
Corrosion or resistance in purge connector
Bad PCM

Possible Solutions: With a P0441 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:
Common Chrysler fix - Replace Leak Detection Pump / LDP
Repair damaged EVAP lines or canister
Repair open or short in voltage feed circuit to Purge Solenoid
Repair open in PCM purge command circuit
Replace purge Solenoid
Replace vacuum switch
Repair restriction in Evap line or canister or soleniod
Repair resistance in purge connector
Replace PCM



Hope this helps (remember to rate and comment this answer).

The technical meaning of the code is Evaporative Emission Control System Malfunction.

P0440 EVAP System No Flow can occur during the following conditions:
Fuel filler cap might be loose

• Leak in the fuel tank, fuel filler neck or fuelsending unit 'O' ring.
• PCM might have failed.
• Purge vapor line might have clogged.
• Purge or vent solenoid power circuit is open .
• Fuel tank pressure sensor is damaged, disconnected or it failed.
• Charcoal canister is filled with fuel or moisture.

P0440: This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. 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 will likely not notice driveability problems with this code.

P0014: This indicates a camshaft position sensor problem which could cause your driveabilty issues.

P1345: This is a crankshaft or camshaft position sensor malfunction which could also be an issue with your driveabilty, i would have this checked by a professional scan tool such as a modis.

This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of alot of parts, including the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicles 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 engin

heres some things you can try
Remove and reinstall

the gas cap, clear the code, and drive for a day and see if the codes come back.
Inspect the EVAP system for cuts/holes in tubes/hoses
Inspect for damaged or disconnected hoses around the Evap purge solenoid
Check and/or replace the sensor
Check and/or replace the purge valve
Have a professional use a smoke machine to detect leaks