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Help w/ Code: P0446 - EVAP ...PCV stuck in case (2.7L)

POE

By POE
in Troubleshooting, Warranty & Recalls

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POE Enthusiast

POE

Posted
Posted

 I live in MN, so clearing this CEL to get my remote start working is important. 

 

2019 Silverado 2.7L

 

CEL Code = P0446 - Evaporative Emissions System Vent Control Circuit

Also, when I fill the tank, the gas pump shuts off prematurely MANY times before I can get the tank full.

 

I'm not sure how to resolve this, but I bought a new PCV valve and Purge Valve hoping these would help. But I can't figure out how to remove the old PCV. As you can see in the pic below, the PCV is held in place by 3 prongs with 90° lips that hold it in the case. How do I remove this?? I tried pulling on it pretty hard, but nothing happened other than some bending and I thought I might break it. Am I suppose to pull harder till it pops out?

 

I have yet to try and install the purge valve. I'm not even sure I bought the right part. This part is under the truck bed below the gas fill tube, right? There are literally zero videos on youtube for items like this on the 2.7L engine. (I know I just need to go look under the bed to see, it's just been cold and wet lately.)

 

Does anyone have a download for a 2.7L Service Repair Manual? 

 

PCV: (shows retaining clips)

No photo description available.

 

Purge Valve:

image.png.55e849b48926ef84f5d0007062277188.png

 

image.png.5125f723432f9da17d0c43d904cb96a9.png

Kilgore Trout Enthusiast

Kilgore Trout

Posted
Posted (edited)

Not sure how the PCV would be playing a role.  I also don't think your purge valve is the problem (it is located up near the engine intake and allows your engines vacuum to draw vapors into the intake).

 

I think you likely need a "vent solenoid".  There are a few YouTube videos covering your MY replacement, but it is straight forward, a couple of hoses (one from the canister to the vent solenoid, the other going to the end of the vent line).

 

Here is a video explaining the system operation.  The vent solenoid needs to be open for your tank to fill easily and not keep kicking off.

 

 

Edited by Kilgore Trout
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POE Enthusiast

POE

Posted
  • Author
Posted

Thank you Kilgore Trout

 

I ordered a Vent Solenoid. Hopefully this will do the trick. Removing that CEL and getting that remote start working will really help. 

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POE Enthusiast

POE

Posted
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Posted (edited)

146,000 miles. No warranty. 

 

Yes, this is a 2019 Silverado 1500, with the 2.7L turbo. It's just spun a lot of miles in a short time.  

Edited by POE
newdude Senior Enthusiast

newdude

Posted
Posted (edited)
On 11/11/2021 at 11:03 AM, POE said:

 I live in MN, so clearing this CEL to get my remote start working is important. 

 

2019 Silverado 2.7L

 

CEL Code = P0446 - Evaporative Emissions System Vent Control Circuit

Also, when I fill the tank, the gas pump shuts off prematurely MANY times before I can get the tank full.

 

I'm not sure how to resolve this, but I bought a new PCV valve and Purge Valve hoping these would help. But I can't figure out how to remove the old PCV. As you can see in the pic below, the PCV is held in place by 3 prongs with 90° lips that hold it in the case. How do I remove this?? I tried pulling on it pretty hard, but nothing happened other than some bending and I thought I might break it. Am I suppose to pull harder till it pops out?

 

I have yet to try and install the purge valve. I'm not even sure I bought the right part. This part is under the truck bed below the gas fill tube, right? There are literally zero videos on youtube for items like this on the 2.7L engine. (I know I just need to go look under the bed to see, it's just been cold and wet lately.)

 

Does anyone have a download for a 2.7L Service Repair Manual? 

 

 

 

PCV and the Purge valve won't fix a vent solenoid code.  Also, PCV valve DOES NOT just pull out.  The front upper timing cover has to be removed to change it.  Also, whatever that tube valve thing you have a picture of, what is that?  The purge valve (and the super common purge pump) for a 2.7T Silverado engine look NOTHING like that.  

 

You've most likely got a failed EVAP Vent Solenoid.  You will most likely need p/n 84613138 EVAP vent solenoid to fix your issue.

 

The VENT VALVE is under the truck, in front of the tank and behind the EVAP canister.  Two plastic fittings and one screw.  The quick disconnects, there should be a WIDE band on one side of the fitting.  PUSH IN on the WIDE band and while holding it in, pull the fitting off the line its connected to.  

 

Hopefully you can return the parts you bought that won't fix your P0446, providing you didn't install any of them.  

 

sedf.thumb.png.35ec1fe37275a498bcdde8e4356fcf60.png

Edited by newdude
  • Like 2
newdude Senior Enthusiast

newdude

Posted
Posted (edited)
On 11/11/2021 at 11:03 AM, POE said:

 

image.png.5125f723432f9da17d0c43d904cb96a9.png

 

 

 

 

ALSO.

 

Unless I'm reading your scanner wrong, it says you have 3 other codes.  What are the other 3?

Edited by newdude
  • Like 2
POE Enthusiast

POE

Posted
  • Author
Posted
2 hours ago, newdude said:

PCV and the Purge valve won't fix a vent solenoid code.  Also, PCV valve DOES NOT just pull out.  The front upper timing cover has to be removed to change it.  Also, whatever that tube valve thing you have a picture of, what is that?  The purge valve (and the super common purge pump) for a 2.7T Silverado engine look NOTHING like that. 

First off, thank you so much for your input!
I've been trying to find info on this new Chevy model and it's been difficult. I was trying to find part numbers based on chevy-parts-online.com parts schematics but I guess I ended up with some bad advice and the wrong part numbers (even if I did need to replace the purge valve solenoid). I've been confused about that one even after the ebay seller answered my question directly to say that it fit my truck. The PCV valve is at least the right part, but I guess I'll save myself the labor and leave the current on in place. 

 

2 hours ago, newdude said:

You've most likely got a failed EVAP Vent Solenoid.  You will most likely need p/n 84613138 EVAP vent solenoid to fix your issue.

I'm glad you confirmed that part number. Since I made this post, I have ordered that exact part number. It is in transit now. 

 

I did not install any parts yet. I'll try to return, but they were cheap, so if I can't, it's not a big deal. 

 

The scanner had the ONE error, but had multiple pages of info to scroll through and read. So I'm praying this vent solenoid will fix the CEL and I can use my remote start. We have snow on the ground now in Minnesota. 

Thanks again. That was the clearest reply I have gotten for this topic on this board and two Facebook groups. 

 

 

  • Like 1
POE Enthusiast

POE

Posted
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Posted (edited)

And maybe this board won't let me 'react' to others' posts because I'm too new, but just pretend I 'liked' your posts. 

 

 

EDIT: Yup, there it is. After the 5th post I can now react to others' posts. 

Edited by POE

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