P0449 Buick -replaced purge solenoid and vapor solenoid on tank, checked pink wire also?

Question

should i replace the cannister vent solenoid valve as well?

Answer 1

HI there,

Sometimes you can get this code when there is another issue with the system. If the pressure sensor doesn't see a change in the pressure then it will set off a code. I would test the VCV, remove it and add power and ground, you should hear it clicking when you do this. If you do then it's not the issue. If not, then it is. When the system purges it's like sucking through a straw with your finger over the end.