Problem with my 2000 PONTIAC GRAND AM GT
code P0449.
Why does my car HAVE A CHECK ENGINE
LIGHT on. IT IS FOR P0449. I CHECKED THE
VENT SOLENOID AND IT IS TURNING ON AND
OFF. COULD THE SOLENOID STILL BE BAD?
WHAT ELSE SHOULD I DO? THANK YOU.

Answer:
If the vent valve is functioning, it is POSSIBLE
that the solenoid in the valve is functioning, but
the resistance is either too high or too low, and the
PCM sees that and sets the code. If you do not
have any leak codes along with it, then i would say
to check the resistance of the wires between the
pcm and the solenoid.

No more than .2 ohm on each. Make sure not
grounded, and not shorted together. If the wiring
all checks out, then i would replace the solenoid
and clear codes. Also, be sure you are checking
the vent valve, and not the Purge valve. Purge
valve is on the engine, vent is under the rear.
2002 Chevy Silverado 2500HD. Service Engine Soon. Codes:
EVAP input low. I Replaced purge solenoid assembly. Low input
to evap could the canister be bad or ?

Answer:
There are many components to the EVAP system on your
Silverado. A low input code refers to voltage levels at a sensor.
The canister itself has no electronic sensors so it most likely is
not bad. A general check of components should be done to
check for system leaks to start. A good sealing gas cap,
preferably factory, is necessary as well. If you've changed the
Purge Solenoid up near the top of the intake manifold, you
should check the Vent Valve underneath the truck located at the
rear of the gas tank.

There is an updated design from GM for your vehicle. Wiring and
connectors should be checked for corrosion and wear. There is
possibly an updated PCM software calibration that needs to be
done as well.
Code P0449 On Chevy And Pontiac
1998 Pontiac grand am v6 4 door v6.
Question = For some reason I can't get my emissions done
because when they plug in the machine it won't work they get
nothing.

We have checked all fuses under Hood and the inside fuses and
they are fine,what can I do help!
Answer:
The emissions station is basically plugging in a scan tool, similar
to what a mechanics would plug in to check for codes. If the
scan tool cannot communicate with the car computer, and the
fuses are all good, then you either have a bad computer or the
wire used to communicate to the car computer has a break in it.
Turn the key to the ON position and see if the check engine light
comes on, if it does not, then most likely the computer is bad. If
it does come on, that communication wire is going to need to be
checked.

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