P0455 code large leak detected?

2016 CHEVROLET TRAVERSE

139,000 MILES • 3.0L • 4WD • AUTOMATIC

JULIANNE MASON

MEMBER
3 POSTS

I have a p0455 code large leak detected. I also get message on the dash to tighten my gas cap which I have gotten since buying the car 2 years ago. I have already changed my maf sensor. Where is the evap emissions purge valve located. I am recently widowed and disabled. If its easily accessible i may be able to change it out myself. I have inspected what hoses i could see. I cant access the airfilter does that black cover need to come off ? Until i can get it repaired can i still drive the car . I need to work.

Sep 6, 2026 at 10:43 AM

STRAILER

✓Experienced Mechanic
55,579 POSTS

I’m very sorry for your loss. The good news is that a P0455 EVAP leak generally does not mean the engine is in danger, and you can normally continue driving while arranging the repair, provided you do not smell raw gasoline or see fuel leaking. The engine-mounted EVAP purge valve is located on top/front of the intake manifold.

The large black plastic engine appearance cover may need to be removed for access. On most versions, remove the oil-fill cap, lift the cover from its rubber retainers, and reinstall the cap temporarily so nothing can fall into the engine. You should not need to remove the air-filter housing. The purge valve normally has one electrical connector, one vapor-line connector, and a retaining bolt.

Here is the valve location and a video to help as well, make sure to clear the codes once the repair is completed.

https://www.youtube.com/watch?v=aTNr3IEgVF0

Image (Click to enlarge)