Need help 2019 5.3 p0455 - SOLVED

[ptm82379]

Hi all, my cel came back on so I got the code read. I don't have a gas cap so it isn't that. Several things are listed. Before we begin I do have a upr catch system installed. I'm not seeing any issues other than a slight mileage drop and oil vapors smell in the cabin.

Where should I look?
Evap purge solenoid valve, evap can vent solenoid, evap can, do these trucks even have that stuff??
I did order the vapor can purge solenoid that is behind the throttle body.
Could it just be the pcv?

 

[ptm82379]

Did I put this in the wrong sub forum?

 

[zbad55]

Did I put this in the wrong sub forum?

There are plenty of threads to look thru for a P0455 code, I would suggest searching thru them to find out what you can try and do, below is just one example,

Issues with P0455

Folks i am having issues with filling at gas pump. To the point of gurgles at filler neck for 3 minutes. I recorded a video but can't upload it here so i did my best to provide a picture. Parts that have been replaced are gas cap, charcoal canister, vapor canister vent valve and purge solenoid...

www.tahoeyukonforum.com

 

[Fless]

It could still be the gas filler leaking (not sealing).

 

[SpyShops212]

Purge valve

 

[Oh Kee Pah]

I had been dealing with the P0455 for almost 8 months. All of those with intermittent Check Engine dash icon illuminating. Would also usually receive a "Tighten Gas Cap" message prior to check engine light coming on. Noticeable decrease in engine performance and gas mileage. Last couple months it always was seemed to be searching for a gear and just lacking power all together.

Wasted 2x $160 on Chevy techs looking it over. I even got to the dealer once with an appointment and check engine light went off on the way over, so they were no help.

SOLVED: Followed advice of a TYForum member and used the "shotgun spread" approach.
Replaced the following parts, cleared codes and so far been running good for over a month now.

Fuel Cap (rear of vehicle)
Vapor Canister assembly (rear of vehicle)
Purge valve (engine bay)

All parts can be purchased online. All can be installed by yourself, dealer or mechanic.


Safe Travels

 

[ptm82379]

It ended up being the purge solenoid. After I replaced it the code hasn't come back.

 

[tom3]

Thanks for the comeback. With the code in the title a future search by someone should find this thread.

 

[RB_Trucker]

This was a good thread to come by, I just ordered an own purge valve because I have an ongoing issue with the CEL everytime
My wife fills the suburban. I’ll be changing it out in a few weeks and I’ll post an update.

 

[tom3]

One thing I've started doing these days is too just fill up to the first click, then quit. Had a problem with our old Blazer that the code showed a gas tank problem. I checked everything in the system, all good. After several first click fills it just went away and hasn't came back.