Question about Chevrolet Cavalier
First try the gas cap to make sure it is on secure and tight.
Code P0440 indicates a problem with the EVAP vent solenoid, which essentially controls the venting of your gas tank in order to maintain a consistent pressure in the tank. This solenoid is mounted on the back of the chassis cross-member just behind your gas tank.
However, a loose or leaking vent hose that connects to this solenoid can also cause this code to appear.
Code P0446 indicates that the VCM (Vehicle Control Module) received
a failure when it tested the EVAP vent solenoid.
The VCM monitors the performance of the Evaporative Emission (EVAP) system by applying a predetermined level of vacuum to the EVAP system and monitors the vacuum decay rate. The VCM sets this code if the vacuum decay rate is more than a predetermined value.
Again, this could indicate a loose or leaking vent tube.
This solenoid is very easy to test simply by first checking for continuity across the coil, if that's good then applying 12 volts across the two pins on it will cause it to "click" changing the position of the valve.
Posted on Mar 22, 2011
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Posted on Jan 02, 2017
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