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Well I had an ongoing thread I posted about a month ago, detailing and documenting what has been done to vehicle, what checks / tests I have done, and what the dealer has told me. Now its gone??? And a week or so ago I came on here to update my latest info only to find out that I was banned for spam??? WTH? Said please contact admin if this was in error. Well....that was fun. Cant to squat with this website when "banned" so just how am I supposed to "contact admin"????? Had to clear history and cookies and all that. Well, finally I'm back.....but my previous thread and all its info are gone? Just wonderful. Nothing going right....just like with this stupid car.

Anyway, on to business. The car is actually a 2015 Buick encore. I am fighting an engine issue with lacking power.

Sometimes the car runs perfect.....other times its gutless. And while in its "gutless" state....sometimes it will throw a code.....but more often than not it wont throw a code.

I personally have checked the PVC system and checked for a blown diaphragm in the valve cover. Have also cleaned the throttle body, as well as preformed a boost-leak test. All is fine.

From the time this issue first started, it was never really an issue until hills. Its pretty flat around me, and its my wifes vehicle and she baby's it. So under normal conditions it really aint making boost anyway. But a new position with her company has her making a 1.5hr drive further (and pretty hilly) about once every two weeks. Everytime she makes this drive she complains that it can barley make it up hills. (when I say hills, its not like mountains. ITs interstate grades, in central ohio for crying out loud.) Once in a blue moon it will throw a freeze frame P0299 (underboost) code. But most times not. For all intent's and purposes, the thing seems to run great.....just as if you were towing 20k behind this little thing.

So after battling this intermittent issue (which I now think was only intermittent due to driving some hills only once every few weeks)...for about 6 months I decide its time for a dealer visit. I normally do all my own wrenching. Actually graduated college in 05 with an associate degree for working on vehicles. Just chose Industrial Multicraft as a profession rather than working in a dealership. But this has me stumped. I can us a laptop and interface with RXlogics 500 and 5000 in the factory.....but automotive computers are a whole different animal that I am not equipped to communicate with.

As I feared (and my hesitation for wanting to take to the dealer)....they had it for two days and couldn't find anything wrong. I honestly dont think they drove the car more than 5 min. They wanted us to come drive it more, and if a code came on not to clear it and bring it back promptly. I asked the mechanic what he "checked" in the two days. He rattled off all the same stuff I already checked. Throttle body cleaning, PVC system, Vacuum leak / cam cover issue, etc. I asked him about the turbo wastegate as thats one thing I had not checked and what the odds were it was intermittently hanging up causing issues. He said it did have a little slop and "could" be intermittently hanging up causing the issue. HE also said there were cracks at the wastegate (which is a common thing but not an issue). So when we left I told the wife to drive a little more aggressively to try to force it it act up since we dont have good "hills" to test it on.

Didnt make it 5 min and its a gutless turd again and pops a code. Took right back to the dealer, but all the techs were gone. (This was just after 5 on a friday). They were busy saturday, didnt get to it monday...finally tuesday they call and say it needs a turbo. And that we can come and get it if we want to think about it and they have to order parts anyway.

Im still not convinced its the turbo. I think the mechanic is just piggy-backing off of my hypothesis that the wastegate is hanging up as thats exactly what he said the issue is pretty much in "my words" as he described the problem to me and why a new turbo is needed.

I borrowed a bluedriver off a guy at work if you guys are familiar. So I could monitor and record MAP data, pedal position, "commanded throttle position" , "accelerator position" etc.

It is plain as day on the data and charts that when the issue occurs....its making NO BOOST.I left the heat shroud off so I could actually see the wastegate actuator. When this issue occurred during my testing with the bluedriver, on multiple occasions I would get out and wiggle the wastegate. No change, still no boost. So I am not convinced that the wastegate....even though it is rough and sloppy, is the issue. But when this low-power issue occurs.....the "commanded throttle position", "actual throttle position" and "accelerator position B" as labeled in the bluedriver data all drop WAY off, and the car simply isnt making boost. Even though the "accelerator pedal position" is way above where it normally is when things are working properly. The engine revs way up....4500rpm+....pedal position high.....but yet no boost, and it appears the throttle body isnt opening or even being commanded to be open.

So its the "what came first, the chicken or the egg" analogy. Is the computer sensing an issue with the turbo and preventing the "drive-by-wire" throttle butterfly from opening. OR is there some other issue preventing the butterfly from opening and THAT is what is causing it to not make boost because the engine simply isnt breathing enough air to allow turbo to spool???

I drove this car up and down the road, from babying all the way up to romping on it for 30 min straight and never making boost. Yet not one code was thrown. Was expecting to see a P0299. But lack of code tells me the computer is seeing exactly the boost it ought to see based on the other parameters. And again, wiggling and moving the wastegate made no change. BUT.....shutting off the engine for a mere 2 seconds and restarting....all of the sudden everything works perfectly again, and making plenty of boost? A quick powercycle is making me think the issue is more electrical gremlins rather than a mechanical issue (wastegate).

My personal theory is that something other than the turbo is causing the throttle to not open. And a closed throttle (or mostly closed) preventing the engine from breathing is causing no power and no boost. And that the once in a blue mood that I get a P0299, may indeed be the wastegate hanging up....but that is a very infrequent problem and the much more frequent issue of "No power and no code" is something totally different.

My fear is that I am gonna spend alot of money on a turbo....then still have the same issues and be right back at square one. And not sure what recourse I'll have with the dealer if they failed to diagnose the issue correctly? I dont like paying for them the guess and throw parts at it hoping they eventually guess right.

Sorry it was long winded, but hoping someone will have some insight.
 

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I'm Having the exact same issue with my 2013 Cruze and wondering the same thing, I don't want to start buying expensive parts until I'm sure. I've also noticed its worse on wet days.
 

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Check the Wastegate actuater.

 

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Discussion Starter #4
I'm Having the exact same issue with my 2013 Cruze and wondering the same thing, I don't want to start buying expensive parts until I'm sure. I've also noticed its worse on wet days.
How many miles? My buick has 75k on the clock. I havent noticed wet conditions having an effect
Check the Wastegate actuater.

Elaborate? What to check? What is normal operation? Because driving the car while the issue is present, the actuator is actively pulling the wastegate closed and takes quite a bit of force to overcome. And having someone in the car bliping the throttle, the actuator opens just a tad at higher RPM then snaps back closed.

And if the actuator were acting up, leaving the waste gate hang open, wouldnt that throw a p0299 code? Which I am not getting 90% of the time, even after driving for 30 min with ZERO boost pressure
 

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Mine is up there i have 175,000 miles on it and have run the trifecta tune (higher boost pressure) most of its life. So I strongly suspect its my turbo. I've done the pressure test and intake checks, I replaced the valve cover last year. Yesterday I got the P2135 Code witch is the throttle position sensor mismatch. That's why I'm wondering if its the throttle body causing the boost issue or the turbo causing the throttle code. I just gave my waste-gate rod a wiggle, there is a little movement but i will have to remove the heat shield to properly have a look.
 

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Mine is up there i have 175,000 miles on it and have run the trifecta tune (higher boost pressure) most of its life. So I strongly suspect its my turbo. I've done the pressure test and intake checks, I replaced the valve cover last year. Yesterday I got the P2135 Code witch is the throttle position sensor mismatch. That's why I'm wondering if its the throttle body causing the boost issue or the turbo causing the throttle code. I just gave my waste-gate rod a wiggle, there is a little movement but i will have to remove the heat shield to properly have a look.
I just wish I would get a code. Like I said, once in a blue moon I get a p0299 underboost. Which I suspect is indeed the wastegate hanging up. And when that code is set....the issue is only momentary. Like driving in some hills. One hill may have the issue and set code....but next hill it is fine and plenty of power (but code remains as freeze frame). I clear the code and it dont come back for a LOOONGG time....and when it does....its momentary again just like I described.

But 90% of the time this thing is a turd and making no boost.....there is NO code...so I dont suspect wastegate and thing there is another issue that is the cause of most of my issues.

I can deal with the wastegate hanging and tripping a code once in a great while. What I cannot deal with is a gutless turd with no codes and no boost and no clue as to why
 

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I just wish I would get a code. Like I said, once in a blue moon I get a p0299 underboost. Which I suspect is indeed the wastegate hanging up. And when that code is set....the issue is only momentary. Like driving in some hills. One hill may have the issue and set code....but next hill it is fine and plenty of power (but code remains as freeze frame). I clear the code and it dont come back for a LOOONGG time....and when it does....its momentary again just like I described.

But 90% of the time this thing is a turd and making no boost.....there is NO code...so I dont suspect wastegate and thing there is another issue that is the cause of most of my issues.

I can deal with the wastegate hanging and tripping a code once in a great while. What I cannot deal with is a gutless turd with no codes and no boost and no clue as to why
If it's getting an underboost condition though it will throw a code. If it feel like a gutless turd and not throwing a code something else is going on.
 

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If it's getting an underboost condition though it will throw a code. If it feel like a gutless turd and not throwing a code something else is going on.

Its definitely NOT making boost when this happens and its a gutless turd. I am watching the MAP data on the scanner graph, as well as a mechanical gauge hooked up.

So that most certainly is why it is gutless. Why it is not throwing a code is what puzzles me. It seems as if the computer doesnt want boost, like it thinks we just want to coast along, even though we are hard on the accelerator pedal, and even causing the transmission to downshift and revs to go up. Just no boost, no code.
 

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Its definitely NOT making boost when this happens and its a gutless turd. I am watching the MAP data on the scanner graph, as well as a mechanical gauge hooked up.

So that most certainly is why it is gutless. Why it is not throwing a code is what puzzles me. It seems as if the computer doesnt want boost, like it thinks we just want to coast along, even though we are hard on the accelerator pedal, and even causing the transmission to downshift and revs to go up. Just no boost, no code.
That's really strange....
 

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I'm not sure if you've checked this but it might help. My P0229 usually does not trigger the CEL. It usually appears as a pending fault ( I'm using Torque Pro to scan) I will only get the CEL to turn on if I'm flooring it after the car has gone into low boost mode, my guess is the computer is not allowing the throttle body to open up fully. Me flooring it causes the Throttle position code I get along with the Under boost code. LOL **** computer controlled everything.
 

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Well I had an ongoing thread I posted about a month ago, detailing and documenting what has been done to vehicle, what checks / tests I have done, and what the dealer has told me. Now its gone??? And a week or so ago I came on here to update my latest info only to find out that I was banned for spam??? WTH? Said please contact admin if this was in error. Well....that was fun. Cant to squat with this website when "banned" so just how am I supposed to "contact admin"????? Had to clear history and cookies and all that. Well, finally I'm back.....but my previous thread and all its info are gone? Just wonderful. Nothing going right....just like with this stupid car.

Anyway, on to business. The car is actually a 2015 Buick encore. I am fighting an engine issue with lacking power.

Sometimes the car runs perfect.....other times its gutless. And while in its "gutless" state....sometimes it will throw a code.....but more often than not it wont throw a code.

I personally have checked the PVC system and checked for a blown diaphragm in the valve cover. Have also cleaned the throttle body, as well as preformed a boost-leak test. All is fine.

From the time this issue first started, it was never really an issue until hills. Its pretty flat around me, and its my wifes vehicle and she baby's it. So under normal conditions it really aint making boost anyway. But a new position with her company has her making a 1.5hr drive further (and pretty hilly) about once every two weeks. Everytime she makes this drive she complains that it can barley make it up hills. (when I say hills, its not like mountains. ITs interstate grades, in central ohio for crying out loud.) Once in a blue moon it will throw a freeze frame P0299 (underboost) code. But most times not. For all intent's and purposes, the thing seems to run great.....just as if you were towing 20k behind this little thing.

So after battling this intermittent issue (which I now think was only intermittent due to driving some hills only once every few weeks)...for about 6 months I decide its time for a dealer visit. I normally do all my own wrenching. Actually graduated college in 05 with an associate degree for working on vehicles. Just chose Industrial Multicraft as a profession rather than working in a dealership. But this has me stumped. I can us a laptop and interface with RXlogics 500 and 5000 in the factory.....but automotive computers are a whole different animal that I am not equipped to communicate with.

As I feared (and my hesitation for wanting to take to the dealer)....they had it for two days and couldn't find anything wrong. I honestly dont think they drove the car more than 5 min. They wanted us to come drive it more, and if a code came on not to clear it and bring it back promptly. I asked the mechanic what he "checked" in the two days. He rattled off all the same stuff I already checked. Throttle body cleaning, PVC system, Vacuum leak / cam cover issue, etc. I asked him about the turbo wastegate as thats one thing I had not checked and what the odds were it was intermittently hanging up causing issues. He said it did have a little slop and "could" be intermittently hanging up causing the issue. HE also said there were cracks at the wastegate (which is a common thing but not an issue). So when we left I told the wife to drive a little more aggressively to try to force it it act up since we dont have good "hills" to test it on.

Didnt make it 5 min and its a gutless turd again and pops a code. Took right back to the dealer, but all the techs were gone. (This was just after 5 on a friday). They were busy saturday, didnt get to it monday...finally tuesday they call and say it needs a turbo. And that we can come and get it if we want to think about it and they have to order parts anyway.

Im still not convinced its the turbo. I think the mechanic is just piggy-backing off of my hypothesis that the wastegate is hanging up as thats exactly what he said the issue is pretty much in "my words" as he described the problem to me and why a new turbo is needed.

I borrowed a bluedriver off a guy at work if you guys are familiar. So I could monitor and record MAP data, pedal position, "commanded throttle position" , "accelerator position" etc.

It is plain as day on the data and charts that when the issue occurs....its making NO BOOST.I left the heat shroud off so I could actually see the wastegate actuator. When this issue occurred during my testing with the bluedriver, on multiple occasions I would get out and wiggle the wastegate. No change, still no boost. So I am not convinced that the wastegate....even though it is rough and sloppy, is the issue. But when this low-power issue occurs.....the "commanded throttle position", "actual throttle position" and "accelerator position B" as labeled in the bluedriver data all drop WAY off, and the car simply isnt making boost. Even though the "accelerator pedal position" is way above where it normally is when things are working properly. The engine revs way up....4500rpm+....pedal position high.....but yet no boost, and it appears the throttle body isnt opening or even being commanded to be open.

So its the "what came first, the chicken or the egg" analogy. Is the computer sensing an issue with the turbo and preventing the "drive-by-wire" throttle butterfly from opening. OR is there some other issue preventing the butterfly from opening and THAT is what is causing it to not make boost because the engine simply isnt breathing enough air to allow turbo to spool???

I drove this car up and down the road, from babying all the way up to romping on it for 30 min straight and never making boost. Yet not one code was thrown. Was expecting to see a P0299. But lack of code tells me the computer is seeing exactly the boost it ought to see based on the other parameters. And again, wiggling and moving the wastegate made no change. BUT.....shutting off the engine for a mere 2 seconds and restarting....all of the sudden everything works perfectly again, and making plenty of boost? A quick powercycle is making me think the issue is more electrical gremlins rather than a mechanical issue (wastegate).

My personal theory is that something other than the turbo is causing the throttle to not open. And a closed throttle (or mostly closed) preventing the engine from breathing is causing no power and no boost. And that the once in a blue mood that I get a P0299, may indeed be the wastegate hanging up....but that is a very infrequent problem and the much more frequent issue of "No power and no code" is something totally different.

My fear is that I am gonna spend alot of money on a turbo....then still have the same issues and be right back at square one. And not sure what recourse I'll have with the dealer if they failed to diagnose the issue correctly? I dont like paying for them the guess and throw parts at it hoping they eventually guess right.

Sorry it was long winded, but hoping someone will have some insight.
My 1st suggestion would be go on Amazon and buy a snake camera pop off the Turbo airline going from the Turbo to the top of the intake manifold you will take this snake and put on in different attachment that they provide it has a mirror on it so you can stick it inside the hole on the intake manifold and look for that red. if you don't see that red. it means that got sucked up by your intake manifold and you can that boost to properly without it just replace it and see where you get truthfully the intake manifold was not that complex as I thought it was going to be it took me an hour to get it off and it took me an hour and 15 to get it back on and I've never done one of them before only 1 of the old school cars P0299 on a Chevy cruise does not just mean waste gate it actually means air induction system I'm wondering if my Throttle body is going because I've been having P0299 for a very long time I had changed my intake manifold valve cover mass air flow sensor boost sensor map sensor Turbo Turbo oil supply line Most of that within the last month Truthfully people say the Chevrolet Turbo Is not a good Turbo it is I got at least a 165000 miles out of my Turbo in truthfully I don't think I needed to replace it I think it was my intake manifold the entire time
 

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My 1st suggestion would be go on Amazon and buy a snake camera pop off the Turbo airline going from the Turbo to the top of the intake manifold you will take this snake and put on in different attachment that they provide it has a mirror on it so you can stick it inside the hole on the intake manifold and look for that red. if you don't see that red. it means that got sucked up by your intake manifold and you can that boost to properly without it just replace it and see where you get truthfully the intake manifold was not that complex as I thought it was going to be it took me an hour to get it off and it took me an hour and 15 to get it back on and I've never done one of them before only 1 of the old school cars P0299 on a Chevy cruise does not just mean waste gate it actually means air induction system I'm wondering if my Throttle body is going because I've been having P0299 for a very long time I had changed my intake manifold valve cover mass air flow sensor boost sensor map sensor Turbo Turbo oil supply line Most of that within the last month Truthfully people say the Chevrolet Turbo Is not a good Turbo it is I got at least a 165000 miles out of my Turbo in truthfully I don't think I needed to replace it I think it was my intake manifold the entire time
The pcv check valve you are referring to is intact and present. So I fuled that out.

And if that were indeed the problem....why would it be such an intermittent problem that power-cycling the engine usually makes it go away?
 

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The pcv check valve you are referring to is intact and present. So I fuled that out.

And if that were indeed the problem....why would it be such an intermittent problem that power-cycling the engine usually makes it go away?
Just because you can see it does not mean its working. I recommend you buy the version 3 fix kit and install it.
 

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I've heard of computers not throwing codes before. In one case I'm thinking of, the guy's intercooler hose had popped off. Fortunately, an easy fix.

Have you tried the boost leak test described elsewhere on the forum?
 

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Truthfully more more it's sounding like you're wasting gate because I just checked mine and this is a fairly new Turbo my waist gate Is burned out it's hard to move So I'm not sure how well it's moving I'm just gonna buy a whole new Turbo and call it A-day hopefully that will solve my problem are you doing the work yourself if so just go buy a Turbo If it doesn't work at least you've got Turbo parts I know what you'r going through I constantly get P0299 I've got More than a 193000 miles I installed the new catalytic converter I'm personally looking at some external waste gates maybe modify this system and you something like that I am thinking it'll probly hold a little bit better but I'm not too sure how the cruise is really gonna like that We have the same exact motor and Turbo
 

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Something to consider if an aftermarket wastegate actuator.


You'll have to buy a tune as well. But as long as the turbo itself is good, this might be a cheaper alternative.

But I'd still check for boost leaks first. Much cheaper.
 

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Definitely something to consider that's also something you can do yourself But my problem was The little nipple on the intake manifold it was missing thats probly why I riginal I thought I needed the new Turbo that's what Chevrolet told me I got the Turbo replaced and it still did it then I bought a camera to look inside and the nipple was gone the Tech Did not do a proper diagnostic That's a well known Chevy Cruise Issue So my car the waste gate was shut to block off the Turbo because the Turbo shuts down when the light comes on P0299 so there was no cool air intake and because of that it damaged the exhaust manifold I just have my catalytic converter changed so hopefully that's not blown The intake manifold probly got a lot of bit warmer than normal so hopefully I can get the bolts off I would check the Waste gate disconnect the actuator and then Lift up the actual waiter arm a little bit when your engine is cold obviously see if you can move your Waste gate with your finger if you can your waste gate is good If you can't move it with your finger then your waste gate is badd My 2016 Chevrolet Cruze is going to be nearing 200000 miles The intake manifold should last a while mine didn't go until at least a 190000 miles But I have had 3 valve covers I get about one year out of a valve cover Right now my Turbo kind of gets stuck the waste gate so I'm going to change my Exhaust manifold Right now my car is boosting I'm sure it can't properly go up hills because of the damage to the waste gate but I can at least function I'm sure there's also a crack in it I can stick my camera and there and take a look but what's the sense I are really know what it's going to look like I'm gonna definitely stick my camera down there and see if my turbine is damaged so as long as my turbine is good exhaust manifold it is I'll tell you this looking codes up is not gonna work Because I look up p0299 number 1 thing it says waste gate But Onstar does a diagnostic and they say there's a problem with the air induction system please have serviced wait wait wait you said P0299 chevrolets codes are specific the air induction system that says it Air intake system That was my problem I'm looking up codes that are generic and that's what mechanics are doing but even though I told Chevrolet and my mechanic it's the air induction system they both said now and then I come to find out the nipple isn't in there so when I change it now I boost So if you want your codes for the vehicle to be specific I would definitely definitely go with The description of P0299 or any other code that On star Gives to you
 

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I've heard of computers not throwing codes before. In one case I'm thinking of, the guy's intercooler hose had popped off. Fortunately, an easy fix.

Have you tried the boost leak test described elsewhere on the forum?
Yes. No issues
 

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I have been meticulously going through my engine looking at what I can with a camera and cleaning it up and looking for oil leaks checking whether shootings are tightened things are worn I've been keeping a good look at that my feel injectors seem perfect there's no carbon build-up their fine I figured I would check them since I was taking them out to do The intake manifold I did also clean the Throttle body thoroughly But of course at almost 200000 miles that throttle body actually looked 99.99% clean Probably due to using super Because you're supposed to be using nothing Alas then mid grade which is special So if you using anything but special that could be a problem Because IU super because it's clean I got the repairs on cars when I was younger I didn't have the problem taking the time To do it it was easy enough I always thought By suggestion My father told me I should keep thorough records of my car honestly I should have never done that I should have done what I always do do my own Maintenance and preventative maintenance because there's all kinds of connectors broke in things Reattached properly so I'm turning my entire garage into a shop I have a lot of tools to start with that's for sure I just don't have a lot of diagnostic equipment I've already looked into buying a lift I used to use one when I worked there Honda That Was the only dealership I ever worked for and I will never work for another one
 
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