Service engine light code po 449 - 1999 Chevrolet Silverado 1500

SOURCE: I am getting codes PO440 PO443 PO 449 on my 2000

PO440 Possible Causes:
Charcoal canister is loaded with fuel or moisture
Fuel filler cap is loose, cross-threaded, damaged or wrong part
Fuel tank, fuel filler neck or fuel sending unit 'O' ring is leaking
Fuel tank pressure sensor is damaged, disconnected or it failed
Fuel tank vapor line(s) is clogged, damaged or disconnected
Purge valve vapor line is clogged, damaged, or disconnected
Purge or vent solenoid power circuit is open (check the fuse)
PCM has failed

PO443:
Purge solenoid control circuit is open or shorted to ground
Purge solenoid control circuit is shorted to system power (B+)
Purge solenoid power circuit is open (test the ENG1 fuse)
Purge solenoid is damaged or has failed
PCM has failed

PO449:
Sames as PO443.

Hope this helps.

SOURCE: Codes PO 442, 449 and 455

Check all vacuum lines from the gas tank to the evaporative charcoal cannister by the gas tank and to the purge valve located at the engine. Check the electrical connector at the vent solenoid which should be located on the charcoal cannister and purge valve solenoid by the intake manifold.

SOURCE: Check engine light on popped up code po 449. evap

yep,,, the engin breather is blocked up,,, clean velve or replace it soon

SOURCE: 2002 chevy blazer codes 443 449 i replaced the maf...

p0443 is evaporative emission control system, purge control curcuit malfunction, p0449 is emission control system, vent control curcuit malfunction. p0449 is often a filler cap problem on fuel tank. try tightening cap

SOURCE: The engine light is on.

CODE PO449 EVAP VENT SOLENOID CONTROL CIRCUIT MALFUNCTION CONDITIONS. CHECK FUSE IF GOOD THE VENT SOLENOID FAILED.EVAP LOCATED ON A BRACKET NEAR THE FUEL TANK.