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Originally Posted by lerndoutofnesscity
Where and what should I be looking for to fix this code?
(P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction).
I have a 2000 Buick Century with a 3.1L engine
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Using GM terminology odb-ii P0449 DTC error code for a 2000 model year GM 3.1L is Fuel Tank Vent Circuit Fault. The DTC will set when the PCM checks the output driver for electrical integrity and sees that it is invalid. The output driver feeds the vent solenoid located at the evaporative charcoal cannister. It is not a common evaporative emissions fault but is PCM module related although I believe external circuits could cause the test to fail.