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2011-2016 Cruze 1.4 PCV Valve Cover/Intake Manifold Issues

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2011-2016 Cruze 1.4L PCV Valve Cover/Intake Manifold Issues

Video:
I made a video to help better explain how this whole PCV system works to supplement this article.


Overview
I find myself having to explain this issue to someone almost daily, so in the interest of brevity, I'm creating a thread specifically for people to reference quickly if they have an issue.

The Cruze 1.4L Turbo engine has a terrible PCV check valve design that afflicts 100% of cars I have come across. It's not a matter of if, but when, it will fail. There are three primary components to this system that frequently fail: the PCV regulator diaphragm (some people call it a check valve) on the valve cover, the check valve in the intake manifold, and the corrugated hose going from the intake manifold to the turbo. We will focus on the first two, which are the most likely failures.


Symptoms
Depending on how long you've had this issue, your vehicle may throw a check engine light with any or all of the following codes (DTCs):
P0171
P0106
P1101
P0507
P0299
P2096


Note: lack of check engine light does not mean everything is operating correctly!

Your vehicle may also exhibit any or all of the following symptoms:
  • Elevated oil consumption
  • Smoke blowing through the tail pipe
  • A hissing sound in the engine bay
  • A rough/stumbling idle
  • Loss of power
  • Reduced fuel economy


Diagnosis
Valve Cover
With the engine running, inspect the vent on the PCV regulator diaphragm. The PCV regulator diaphragm has a round non-removable cap on the driver side of the valve cover. Remove the cosmetic cover off of the valve cover:


Underneath, you'll find the cap that covers the PCV regulator diaphragm. If this has failed, the engine will be sucking in air from here, and creating a hissing sound. Place your finger over this hole to cover it. If the engine RPMs change or the hissing stops, the valve cover needs to be replaced.


DON'T STOP THERE! Failure of the valve cover PCV regulator diaphragm may only be a symptom of a greater problem: the PCV check valve in the intake manifold. If the intake manifold PCV check valve has failed and you only replace the valve cover, you will find yourself replacing valve covers every few months not knowing why.


Intake Manifold PCV Check Valve
With the engine off, locate the corrugated hose coming out of the top of the PCV check valve:


With tightly gripped pliers, remove the clip holding the hose off by pulling it out:


Pull the corrugated hose off from the base, taking care not to pull from the hose itself as it may crack or tear. Using a flashlight, look inside the hole. If you are facing the engine bay from the front, there should be an orange/pink/peach nipple/valve on the "back" of that hole that looks like this:


If you don't see that check valve, use q-tips and rubbing alcohol to clean that area and check again. If you still don't see it, this must be addressed.

There's one final part that needs to be checked:


PCV Hose/Valve
In the last section, you need to remove a hose from the intake manifold. That hose has another check valve at the other end of it; at the turbo inlet. To verify its functionality, blow into the hose; it should blow freely. Suck air back through the hose; it should completely block airflow. If it doesn't do either of these, the whole thing needs to be replaced. Those hose also has a tendency to become brittle and crack, at which point it will also need replacing. Be sure to check this hose everywhere if you suspect it is leaking or are hearing a hissing sound in the engine bay.


Repair Solutions
Both of the above components are covered under your powertrain warranty. If your car is still under powertrain warranty, bring your car to the dealer and tell your dealer you are experiencing oil consumption of one quart per 1,000 miles and to reference GM Bulletin PIP5197C.

If the PCV regulator diaphragm on the valve cover has failed, replacement is required and will cost ~$60. Refer to this tutorial for replacing the valve cover. How-To: Replace the Valve/Camshaft Cover (1.4L Turbo)

If the check valve on the intake manifold is missing, you have three options:
1. You can replace the intake manifold with a new one. As of late early 2018, GM is phasing out the intake manifold that ships with all accessories and is selling a bare intake manifold. I don't yet have the part number for that.
2. Dorman has begun releasing an option. However, this option has the same check valve design as the GM manifold, meaning it will be prone to failure and boost leaks, and is not serviceable. The part number is 615-380, but availability is currently limited.
3. You can install one of my Intake Manifold PCV check valve fix kits for as little as $75, which is much cheaper than the Dorman intake (after shipping) while providing you a more robust, leak-free, and durable check valve. My external check valve design allows for easy (doesn't require removal of the intake manifold) servicing and cleaning, and inexpensive replacement. Details are in this thread: GM 1.4L Turbo Intake Manifold PCV Valve Fix Kits

A tutorial for removing the intake manifold is located here: How-To: Remove 2011-2016 Cruze 1.4L Intake Manifold

If the check valve at the turbo inlet has malfunctioned or the hose is cracked, you will need to replace it: ACDelco 25193343 PCV Pipe with Valve


Resources
To learn more about this engine's PCV system, refer to the following thread: 2011-2016 Cruze Limited 1.4L PCV System Explained

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I'm not asking about the check valve in the intake manifold. I'm asking about the PCV diaphragm in the valve cover.
Sorry, I did not see that you were asking about the regulator.
Thanks Xtreme for the detailed write up and videos.

I have the 1.8L version, so no turbo. Is it still the same concept? Check to see if the PCV regulator diaphragm is suctioning air while engine is running? If it is suctioning air, does the 1.8L have a pcv valve to check since there's no turbo? Losing a bit of oil somewhere but haven't found any leaks anywhere and engine idle + performance is still excellent.
To get his attention, you need to use the "Reply" function or use the tag function like this: @Shawn855
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I had a weird issue with my cruze recently. To give a run down, I had the usual codes pop up and found out about the cover and replaced it. Reset codes then month later codes came back... found out about the v3 cruzekit and bought and installed then reset codes and things had been great until 2 months later when Englishtown came on but now instead of a bunch of codes i was down to the 299 underboost code. Checked oil and it was low very low little to none. Replaced that and engine light went off. Was fine after a week but then noticed some smoke in the light at night and looked inside and I have oil around my filler cap. No check engine light. Was wondering what this could be? I am at 121k miles now and this might sound random but my coolant level has always stayed low and someone suggested my problem could be the oil cooler. Would bad seals on oil cooler cause a positive pressure on the crank case? And why no codes? I've checked the filler cap and that doesn't seem to be the problem even replaced it.
What are the usual codes?

... when Englishtown came on???

Potential causes of a P0299 turbo underboost code include:

Intake (induction) air restriction or leak
Failed or damaged turbocharger (sticking, binding, etc.)
Faulty boost/charge pressure sensor
Read more at: P0299 Turbocharger/Supercharger A Underboost Condition


You may not have corrected all of the issues when you installed the kit. You need to clean the engine off and start clean and look for leaks. You also need to make or buy a boost pressure tester.

When you installed the kit, you should have first tested the intake manifold to see if the PCV vacuum diaphragm was blown, necessitating a new valve cover if it was - could be covered under warranty - even though you replaced it earlier, then you should have checked for a blown front crank seal.

As for the coolant level, there is a myriad of known and easily fixable issues with the cooling system. Check the thermostat housing, water outlet, the water outlet to surge tank hose, the surge tank and cap. After you have added Dexcool, make sure you bleed the system correctly or you will have more issues.
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Want some clarification. What if the diaphragm port is not sucking air (or blowing air for that matter)? I have a 13 sonic with the same 1.4t engine, but similar fault codes and rough idles. Couldn't check the valve inside the manifold, but isn't the rough idle caused by the vacuum leak from the torn diaphragm? The check valve issue is the root cause of the torn diaphragm, but can it cause rough idles by itself?
I did not understand your question, but the post you are referring to is about the 1.8 not the 1.4.

You need to check the valve, it is not that difficult and is the same procedure as the Cruze to do it.
Hi can the orange check valve nipple in the intake manifold look like the picture but still cause issues? (Eg not seated properly or half of the valve missing and is there any way to check without removing intake) It is oily in there.Have rough idle, lack of power and blue smoke from exhaust. Corrugated hose can blow through and when sucked back it’s like you can feel a valve close but oily taste in mouth. Regulator diaphragm isn’t drawing any air. Do you think there are any other problems to check that would give similar symptoms?
Yes
Okay cool, but I didn't know if my problem will be fixed with this kit? Under boost audible leak around the intake manifold.... red thing is definitely missing from the non return line fitting.
2011-2016 Cruze Limited 1.4L PCV System Explained
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Okay how do I know which kit to get? The red nipple is gone, it makes a hissing noise under boost and it has a P2261 code for turbo waste gate mechanical malfunction..
It depends on what your end goal is. The newest kit is the cheapest and fastest to install. The older kits have a better check valve and others are made to connect to a throttle body spacer.
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So I've been working on my sister's 2012 Cruze doing some long overdue maintenance. Struts, shocks, fluids, plugs and everything in between. Oil consumption, leaks and poor fuel economy (10 mpg) is what I'm seeing.
I stumbled upon this thread last week while researching some things for her car.
Tonight I ordered a 3.4 kit, thanks XtremeRevolution!
I did the three checks, valve cover diaphragm checked okay, intake check valve missing and pcv pipe to turbo check valve good. My concern is the valve cover. The idle didn't change when I covered the hole. The cap to the diaphragm is concaved inward, this normal?
My concern is, since this car appears to have had less than stellar maintenance and no history, should I go ahead and replace the valve cover or is the test I did good enough to verify all is well with the cover?
Welcome Aboard!(y)

Pop the cosmetic cover and place your finger over the small rectangular opening on the round PCV vacuum regulator. If there is no air blowing out, it is fine.



Picture taken from here:
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I definitely need a new valve cover. I would also like to get the after market V3.4+ GM 1.4L Turbo.
The clarification I need is, do I still need to fix the Intake Manifold PCV Check Valve and/or the hose check valve if I get the after market kit? Does the kit replace those parts?
Welcome Aboard!(y)

Don't forget to introduce yourself and your Cruze here.
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I followed all the steps and both my intake check valve and my hose check valve were both good. But when I would plug the hole on the valve cover nothing would happen. When I pull the dipstick out you can hear the hissing sound like there is a leak somewhere. Just curious if I should replace the valve cover and see or take a different route?
Is the check valve installed correctly? When you say "But when I would plug the hole on the valve cover " you did permanently plug the hole right? Look to see if it is still plugged.
I’m having the same problem with my 2014 Chevy Cruze 1.4L

PCV fix links
I got a kit from Cruzekit.com and put it in but it seems like it does not want to keep up to speed. If I set the cruise at 70 in 6th gear it stays at like 66-67 unless going down a hill then it will catch back up to 70 until I go up another hill. Was wondering what I should maybe look into next if there is something else that is a common deal on these cars?
The fix kit does not really have any direct connection to your Cruise Control system.
Hi. My first time writing but been reading a lot. I have Opel Adam s with the 1.4t ecotec.
I'm not sure if the valve cover is dead since the car runs kind of okay (loosing power when hot) and making no suction noise until I put my finger on the diaphragm hole, than the engine begin to stumble and make all kinds of noises.
Can you please help me figure out if the cover is dead?
Video of the simptom

Thank you
PCV Fix Links
Well aware of that. Been reading for months now before I wrote a word
Well, in that case your question has already been answered.
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Extreme Revolution or anyone...
What's this that's plumbed into the valve cover and how is it plumbed into the system and what's the purpose. I have read all over this forum and didn't see any info about it.

View attachment 300225
[/QUOTE]
IIRC that is his Amsoil bypass filter setup.

How-To: Bypass Filtration Install (1.4L Turbo)

I had a difficult time reading the rest of your post, but it looks like you need a fix kit.
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Today I checked the plug I glued into the intake manifold, I suspected it could have been gone as the glueing process wasn't that easy.
But as far as I can see from above it is still in place, even if it looks a bit messy.
You may need to clean or replace the PCV valve.
I just received the pcv kit in the mail yesterday. I hope this takes care of the oil being pushed out of my dipstick even with new orings installed. 190,000 mikes and I’ve only had to replace one cam cover only because the gasket was leaking oil.
Welcome Aboard!(y)

It should

Don't forget to introduce yourself and your Cruze here.
Hi there, I have what I think is the 2.0 fix kit installed on my '12 Cruze (Just bought it a month ago). If i really get into the gas and build a lot of boost I get a CEL for 0299 Engine Underboost. What could be the cause of this or where should I start troubleshooting? Do i need to clean the components of the fix kit? Ive checked the lines, replaced the main PCV hose (had a bad check valve) and checked the "burst disc" as well. Getting 15 inHg in vacuum but the Torque app only shows about 6psi boost max for Turbocharger Boost/Vacuum while the MAP value shows 20 PSI. My fear is that the wastegate may not be sealing. 176k miles, still alive.
Welcome Aboard!(y)

Don't forget to introduce yourself and your Cruze here.

I think is the 2.0 fix kit installed on my '12 Cruze: Take some pictures of the fixkit installed.

CEL for 0299 Engine Underboost: Potential causes of a P0299 turbo underboost code include:

Intake (induction) air restriction or leak
Failed or damaged turbocharger (sticking, binding, etc.)
Faulty boost/charge pressure sensor
Read more at: P0299 Turbocharger/Supercharger A Underboost Condition


Do i need to clean the components of the fix kit? Possibly. It would not hurt to do so anyways.

replaced the main PCV hose - Post a picture of this hose

(had a bad check valve) - which check valve? Picture.

checked the "burst disc" - And the result is? I assume you mean the one in the picture below? If so, that is the Vacuum Regulator
Motor vehicle Automotive air manifold Auto part Engineering Automotive tire
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