2006 Pontiac G6, P0449

This 2006 Pontiac G6 came in with the SES light on and code P0449 stored. There was also a symptom code of 00 present.

The canister vent solenoid is located at the right rear of the fuel tank. On the top side. You can barely see the red connector with the blue retainer. Click on the picture below to enlarge it.

The fuel tank has to be loosened up and dropped down to replace the solenoid. In fact it has to be dropped some to disconnect the solenoid and test it. The red/white wire should have a 12 volt power signal on it. Power is supplied from the “Emission 2” fuse in the rear fuse box. The PCM supplies a switched ground circuit to the solenoid. I did my testing with the Tech 2 and meters but there was not enough room to take a picture of all of that. I do show later how to do a simple continuity test of the solenoid assembly.

I of course had the vehicle in the air on my rack and used a transmission jack to support the tank. There are two straps that hold the tank in place.  Each strap is secured by a bolt. With the tank supported I removed both attaching bolts and started lowering the tank. To get the tank to move enough I also had to disconnect the tank’s vent and fill hoses at the rear of the tank. Three connections in all.

Once I got the tank to move enough to access the solenoid and it’s hoses I found that I could not get the hoses loose. I did not want to fight with getting the hoses off for hours so I carefully cut the solenoid tubes loose from the solenoid assembly. Care must be taken not to cut the hose, tank or wiring.

Once the hoses were loose they would pull down far enough to remove the tubes from the hoses. The white clamps have to be depressed on both sides.

Then I rotated and pulled the tube loose from the hose with a pair of pliers.

It does take a fair amount of finger force to depress the locking tabs.

The tube is now free from the hose.

There is another hose at the rear of the solenoid that has to be removed in the same manner. Then there is a slot to place a tool into to depress the locking tab.

With the tab depressed the solenoid can be slid to the rear of the vehicle and off of its mounting block.

The two terminals of the solenoid assembly.

I could not show this on the car but an ohm meter will easily tell that the solenoid internal circuit is open. I do recommend testing before pulling this solenoid out.

3 discussions on “2006 Pontiac G6, P0449”

  1. It could be a problem with one or both . It also could be a loose gas cap or evap hose connection.

    The control module tests the evaporative emission (EVAP) system for a large leak. The control module monitors the fuel tank pressure (FTP) sensor signal to determine the EVAP system vacuum level. When the conditions for running are met, the control module commands the EVAP canister purge solenoid valve OPEN and the EVAP canister vent solenoid valve CLOSED . This allows engine vacuum to enter the EVAP system. At a calibrated time, or vacuum level, the control module commands the EVAP canister purge solenoid valve closed, sealing the system, and monitors the FTP sensor input in order to determine the EVAP system vacuum level. If the system is unable to achieve the calibrated vacuum level, or if the vacuum level decreases too rapidly, the DTC P0455 sets.

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