yes- some folks have replaced the throttle body- I think for $128-$150... purchased on ebay.
and no more errors.

Someone just posted pics of the throttle body taken apart-- (the electronics)- and it is NON serviceable based on pics).

 

... Put it back together and it is working again. Could it be possible that the throttle body sensor is starting to go out and needs to be replaced?...

Prior to changing any parts, research each of these codes on the 'net and read what's said about them. It could be something as simple as an electrical connection that went bad, or got corroded.

 

2007 Acadia in the same boat. 2 months ago I saw the Engine Power Reduced, Service Stabilitrack and Traction Control Off warnings. We cleaned the TB and no problems until this morning. We've had snow for the past 3 days and weather has ben extremely cold. After removing the air hose and inspecting the TB again, there is very little oil that has collected since the cleaning in January. So I know that I'll have to replace the TB to get the car back to full operation, but my concern is...why is it going out? What has caused the TB or the TB sensor to fail?

 

My 07 had the TB replaced because it was losing communication with the throttle (gas pedal). Not a common problem but an easy fix

 

So Forum GM, are you saying in your case that it is just a bad sensor and no other looming problems were present?

 

2007 Acadia in the same boat. 2 months ago I saw the Engine Power Reduced, Service Stabilitrack and Traction Control Off warnings. We cleaned the TB and no problems until this morning. We've had snow for the past 3 days and weather has ben extremely cold. After removing the air hose and inspecting the TB again, there is very little oil that has collected since the cleaning in January. So I know that I'll have to replace the TB to get the car back to full operation, but my concern is...why is it going out? What has caused the TB or the TB sensor to fail?

What codes is it logging?

 

I have been getting the StabiliTrak disabled, traction control disabled, and service traction control messages for over a year, I call them the Trio of messages. My mechanic traced it to a faulty Mass Air Flow sensor in the air intake snorkel. He cleaned it but that didn't solve the issue, it needed to be replaced. A year later it went again so I replaced the sensor myself, and the problem was gone.

They have been going bad probably due to the Milkshake/Oil/ Moisture in the snorkel.
This winter, I got the dreaded Reduced Engine Power along with the trio of messages while cruising at 70 MPH. I pulled over and let it sit for 10 minutes, restarted, and went on my way with no further problems. The throttle plate was frozen. This all started on New Year's Eve.

Since then I have had to replace 3 MAFs and empty the intake snorkel a dozen times, sometimes the water came pouring out. I witnessed ice on the throttle plate twice. I had the reduced engine power 3 times in January and February. I replaced the Throttle Body just recently and so far no more reduced engine power issues. I believe the cause of all the oil and moisture is due to a clogged PCV system. I did the modification and it did reduce my oil/moisture problem but did not eliminate it yet.

Search "modern camaro pcv mod". New Throttle Body at Rockauto.com $120, New MAF $50
Can anyone see the pictures below?

 

... I have had to replace 3 MAFs and empty the intake snorkel a dozen times, sometimes the water came pouring out. ...

Are you pulling a Brian Williams on us, or did you make some kind of mod that backfired on you?

 

So Forum GM, are you saying in your case that it is just a bad sensor and no other looming problems were present?

Yeah bad sensor in the throttle body; had no other problems after they changed it out

 

What codes is it logging?

P1516

 

P1516

You might find this interesting reading for resolving the P1516........

Oil in air inlet duct

 

There is a service bulletin related to oil in the intake tube? Interesting.........GeoHawk do you have access to that bulletin or is it here and I have just missed it?

 

I know on the 08s for example- there was a service procedure- which called for changing the gasket and something on the valve covers.

well see if there is an update for the later models.

THis seems like east coast 'issue'. (the freezing part)
where temps are really low.

 

Are you pulling a Brian Williams on us, or did you make some kind of mod that backfired on you?

Oh No, I found out about the mod after the major moisture problems. I did the mod and it eliminated most of the moisture. I pulled the PCV barb off a second time and had to clean it again. Then for a week of normal commuting, maybe even babying it, I had no moisture whatsoever. Then on a 500 mile trip to Vermont and back, I opened the snorkel and found the starting of the milkshake. I pulled the barb off again hoping to find it clogged again, but it was clean. I can live with the moisture that I am getting now and am planning on installing a catch can. I figure that most of the blow by came on the mountain roads keeping up the speed on the hills.

 

I know on the 08s for example- there was a service procedure- which called for changing the gasket and something on the valve covers.

well see if there is an update for the later models.

THis seems like east coast 'issue'. (the freezing part)
where temps are really low.

Yes it has been especially cold this year, but the first time it froze up was New Years Eve cruising at 70MPH in 20 degree temps, although I was coming come back from single digit temps.

 

So, it has now been a week and I have not had any major issues since I unplugged and plugged my throttle body sensor back in. It did act like it was going to go out a couple of days ago while at a stop light, but I put it in park and revved the engine and it seemed to help (not sure if related or not). I am really leaning towards just replacing the whole throttle body. For those of you that have done it yourselves, did you have to do the "throttle down" procedure at the dealer with their computer, or did it work without it? Thanks.

 

It seems like it relearns itself pretty quickly. You may be getting a random misfire, I have been getting those for years. Is there moisture/oil in the snorkel?

 

For those of you that have done it yourselves, did you have to do the "throttle down" procedure at the dealer with their computer, or did it work without it? Thanks.

You may have a day or two of an erratic or high idle as the system "relearns", but you don't need to go to the dealer.

 

I know this is an old topic but I am a fairly new member and I have been having this issue in my 08 SLE 2WD for a little over a year. I took it in to the dealership last winter and they didn't believe me when I told them about the problem. I kinda wondered if the problem wasn't related to the throttle body but I'm not a mechanic. So it sat in the driveway for most of the winter. Finally, we started driving it again and didn't have any issues for a few months until today. Today I was smart enough to do an online search of the 'Engine Power Reduced' error message and I found an article but, because I haven't posted enough, I am still not allowed to post the link. So, do an online search of the error message and you should be able to find the article from Brake And Front End website. It lists 36 steps about how to diagnose and fix the problem.

Fortunately, I happened to be right next to an AutoZone when the error occurred so, after reading the article and letting the car sit for about 15 minutes (it tends to reset and drive normal if I turn off the engine and let it sit for about 15 minutes) I went to AutoZone and had the codes read. The error codes and article confirmed my hunch; it's a throttle body issue. There are a few issues that could be the problem and the article will point you in the right direction. At first, I was trying to see about getting my ECM reprogrammed and updated but the programming modules can be expensive to purchase. You may need to find a mechanic that has one to do the job for you. Next, I looked into replacing the throttle position sensors in the throttle body but I have not been able to find a store that carries them so I may need to replace the throttle body.

Hopefully, this may help anyone else out there that runs into this same issue.

 

...
Hopefully, this may help anyone else out there that runs into this same issue.

Tech Tip: Reduced Engine Power Message Displayed on GM Vehicles

Information in your article is not for the everyday shade-tree mechanic. I don't think a dealer tech would do it either.

 

The code is telling you what went wrong. Sometimes the engine throws a code due to a temporary problem. I carry a Scanner in my 08 Acadia. I have a code about twice a year. When this happens my Acadia goes in to "LIMP" mode. No engine power, stabilitrack and traction control off. I have found that if I read then ERASE the code it restores the vehicle back to normal power and the stabilitrack and traction control are normal. I am not recommending you ignore the code, but if you are on a trip and need to drive back home? I assume that if the problem was not a temporary situation (bad gas) the code will come back. So far this has worked for me. However, I do see we have a history of throttle body problems and yours may need replaced.

 

Hi all.
Hopefully following up on this thread will trigger previous post owners for a reply.
We have a 2012 Acadia, All wheel Drive. uncertain if its an SL or SLT.....it's my wife's so I don't get in and out of it too frequently.

Recently the Service Stabilitrac, Service Traction Control alarms came on with the reduced power. When I research this there seems to be an overwhelmingly opinion that it's the throttle body.
I have a couple of questions if someone would care to offer an opinion.

- do I need more detail before I diagnose this as throttle body? would it help to go to an auto parts store and get the specific error codes?
- some threads mention it could be the connector - ot the throttle body - or just the throttle body needing cleaning. a) would cleaning potentially help or in your opinion - once the lights are on - is it time to replace? b) any easy way to tell if it is the harness vs the throttle body itself?

Lastly. I'm not a mechanic but I'm relatively handy. Are there any decent videos or guides to changing out the throttle body? I've found some decent videos on You Tube but haven't seen anything on changing out the throttle body on the acadia

Really appreciate any replies.

Mac

 

get the codes read.
and do a simple cleaning of the TB. (without removing it). that is spray and move the butterfly around to get smooth movement.
the spray cleaner is about $5.

if this doesnt fix it-- proceed from there.

 

I had the same thing happen to me on 11/11/17. I was on the highway and it kicked off those alerts. Luckily I was not too far from my mechanic....long story short It was my fuel pump. $800 bucks later issue resolved.....and I noticed the acceleration was improved, not that it was an issue before, but I noticed a difference.

 

what model year do you have?
2009+ have 2 fuel pumps... low pressure in tank and High pressure mounted to the side of engine.....

 

sorry...should have been more specific.... I have a 2012 Arcadia SLT, and you are correct it has 2 pumps.. one at the tank and one at the engine... the one at the engine went bad...prior to the issue on 11/11, the car, in my opinion, was running fine and handled well since I bought it used on 7/20/17.

However, after the pump replacement, it accelerates a whole lot better, and my gas mileage per gallon has gone up!

 

sorry...should have been more specific.... I have a 2012 Arcadia SLT, ...

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