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2011 Chevy Impala - Service Stabilitrak - Reduced Engine Power

scotsmanusascotsmanusa Posts: 4
edited May 2015 in Chevrolet

Hi all,

As I see on the forums there are many issues with what seems to be the Throttle Body, sensor etc.
Here is my wonderful story and I will be updating regularly in the next few days. I will add that I commute at least 2 hours per day and rely heavily on my car for work and to take care of my 2 children - 1 of which is special needs.

2011 Chevy Impala LS
61K miles (90% of which were highway)
Running full synthetic oil - changed every 5-6K miles


Left work last night and not driving for more than 30 seconds when the engine light came on followed quickly by what can only be described and mild to moderate jack hammering of the car and the reduced power to engine message.
I pulled over, checked the manual - then Google/Edmunds which brought me here.


I got a ride home after securing the vehicle and came back this morning. Got it towed to the dealership and was told that it was out of bumper to bumper warranty and that it wouldn't be covered under the Powertrain warranty if it was the throttle body or any of the associated sensors.

I'm currently awaiting the call back from the dealership regarding the diagnostic result ($125) and will post everything as it becomes available in an attempt to help anyone else having a similar issue.

It's a shame too - after the research I had done on this car I thought it would be more reliable than my old 2005 Ford Focus. But since May 2013 I've now been left dead by the side of the road twice... first time with a blown thermostat!

So - as I said - waiting on service calling me back. I've also taken the liberty of emailing with the details of the vehicle. I'm trying to take a positive approach to this in the hope GM customer Service will pull through for one of its customers... I can only hope they do!

Good luck and safe driving! Updates coming soon!

See Also: Chevrolet Impala LTZ 2009. Accelerator pedal position sensor replacement! Easy Fix!


  • So I sent a little email to GM regarding this issue and my situation.

    90 minutes after sending the email I received a call from a GM customer service rep that passed me through to a district agent. Linda (the agent) was exceptionally nice, took the details of the issues I'm having as well as previous issues with the vehicle (blown thermostat), contact info for the dealership/service center I dropped the car off at etc.

    She said she'd contact the service center directly to follow through and see what could be done with my case.

    Upon hanging up the service center called and confirmed that it is indeed the throttle body, that it isn't covered under the 5 year/100K powertrain (as of 2010 on all models apparently) and that it would be $650 out the door for parts & labor.

    At this time as I need the vehicle I've approved the work and will be picking it up on Saturday as I'm currently travelling for work... more updates to follow!

  • Kirstie_HKirstie_H Posts: 10,994

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  • Follow-up as of today (Day 3)...

    No return call from the GM district rep but got a call today to say my vehicle had been repaired, that the GM rep had called the shop directly and that GM has discounted the cost of the repairs.

    Initial cost was an even $650 + tax ($679)
    Discounted cost is $571.98.

    At this point I'll be forking out the money as I need my car back. Not sure if anyone else has attempted to contact GM with any similar results - would be good to hear from you if you did!


  • I have the same issue with my 2011 Impala LT. Bought used in 2012, I drive quite a bit, have put approx 30K miles on the car in two years. I have had the same issue as discussed off an on for the entire time I have owned the vehicle. Fortunately, it has never happened while I am driving down the interstate yet. I have found that if I pull over and shut the car off for about 10 minutes, the system seems to "reset" and the error is gone and the vehicle drives normally. The Check Engine light stays on and then goes off in a day or two. I have not taken it to the dealer for service, because, frankly, I can't afford it right now. Especially if I am going to have to take it back several times to resolve the issue
  • Oh no this must be a nightmare I just bought a 2009 Impala from a used car dealership have not even have the car 2 weeks and the check monitor tire system came up along with tire traction n reduce engine power is this a recall or what is going on I am freaking out I am a mother of 2 babies n I work this is my only transportation thought I was getting a good car but oviously I didn't what can I do.???
  • Hello, 
              My wife's 2011 Chevy Impala 3.5l. I've been having the same issue with my car (service stabilitrak, traction control, engine power reduced). 
    The problem is the car is a "drive by wire" car meaning there's a sensor on ur pedal the communicates with the sensor on your throttle telling it where the pedals at and how much to open the throttle. Both sensors are prone to going out and even once replaced the replacements normally only last 2-4 yrs. I know all this cause my buddy is a GM mechanic. I went to local auto store and purchased both parts and replaced myself for roughly $200 something dollars compared to there $1100 dollar job. My buddy told me the GM parts have a chance at lasting a little longer but for that price I could replace them myself 3-4 times with auto zone or advance auto parts or oriellys equivalent. So if your mechanically inclined that's the best route. They need to fix this issue cause it makes me irritated when stuff like this goes unsolved by a leading company. Now on another note my 2012 camaro is having the same problem. I mean seriously GM get on your stuff and do something.
  • tammy2016tammy2016 Posts: 4
    All's I know is if GM knows about this issue wasn't the thing being recalled instead of us forking out money maybe we should call the Better Business Bureau and the newspapers to get their attention I feel like they should fix that on their dime not ours. And I'm sure you won't call me or there won't be any thing from customer service
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