Last post on Jun 30, 2013 at 8:40 AM
You are in the Buick LaCrosse
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Buick LaCrosse, Sedan
#1391 of 2056 Re: 2011 buick lacrosse AWD [awdbl001]
Jan 24, 2011 (2:45 pm)
awdbl: Very interesting messages from the drive system. Methinks that all three events are a product of the same sensor that may or may not be a mechanical problem. I had an ABS light ( pre message center) and it turned out to be a sensor built into the rear brake hub. Whole hub needed R&R and problem went away. Explanation was salt and corrosion (maybe), but not on a car with 1000 miles. Betcha it is a lose connection to one of the ABS, Traction control or AWD system which are all related to the same feedback loop IMO since the messages are intermittent but important due to driveability issues. Obviously a warranty issue and hopefully a short no cost service call but still frustrating on new car. Good luck.
#1392 of 2056 Re: Lacrosse Vibration [e_net_rider]
Jan 26, 2011 (9:54 am)
Just wondering if anyone that has had a highway speed vibration in their 2010 LaCrosse has an update? Has it been fixed on your car? What was done to fix it?
I have had the same problem with mine and and the power train is the main suspect. Since it has been a year since I first experienced the problem and it is still not solved, I am becomming more and more dissapointed that GM has not come up with a resolution for me or anyone else.
#1393 of 2056 Re: Lacrosse Vibration [50324lacrosse]
Jan 26, 2011 (11:33 am)
Dave I have a 2010 Lacrosse, I don't have the vibration problem, I had a steering problem and GM was giving me the run around,I contacted Lemon Law.com, they were my saving grace, for a fix that GM couldn't fix after emon Law contacted them my car is now fixed, try Lemon Law.com
#1394 of 2056 Re: Lacrosse Vibration [benc3981]
Jan 26, 2011 (12:53 pm)
Thanks for your reply. What trim level and wheels do you have? I have the base CS with steel wheels and 3.0 engine.
I just got back from driving a CXL with 3.6 engine and cast wheels. The car had the same vibration and at the same speed range that mine has.
#1395 of 2056 Re: Lacrosse Vibration [50324lacrosse]
Jan 27, 2011 (2:49 am)
What sort of vibration?
Can you tell where it is coming from?
Is it steady? Does it change if you apply slight deceleration or acceleration through the speed you notice it?
Yesterday I noted it is time for rotation. And the tires are so smooth that I'm thinking no re-balance.
#1396 of 2056 Re: Lacrosse Vibration [e_net_rider]
Jan 27, 2011 (7:06 am)
It is a side to side vibration. One would think it was the tires being out of balance. It is not. Test indicate otherwise. Now engineers from GM have it narrowed down to something in the torque converter or something that rotates in a sideways direction of the car.
It usually happens between 60mph and 80mph. I test drove a 2011 CSX yesterday and found it to have the same vibration. Another friend drove one from a different dealership and different model. It had the same thing.
#1397 of 2056 Re: Lacrosse Vibration [50324lacrosse]
Jan 27, 2011 (3:34 pm)
There just is not anything that rotates laterally to the body of the car, except the spider gears in differential and they should not be rotating unless you are driving in circles.
Did the CSX have touring package? It would have hyperstruts.
Were tires RFB? If it seems to be at front, did rotating front to back make any difference?
The calipers might move slightly side to side if rotors are imperfect. Had someone rotated tires prior to it showing up on your car? Have you noted slight braking at those speeds for change?
#1398 of 2056 Re: Lacrosse Vibration [50324lacrosse]
Jan 28, 2011 (9:48 am)
I went for a short drive last night, killed sound, and paid attention. So quiet I did not hear engine, just a bit of road noise.
But felt a nagging side to side bumping motion which also showed up at wheel. At 50MPH it seemed faster than if it were an imbalance issue. If this is what you have found, it is the slight amount of play in suspension bushings that are quite hard material. You will likely find this in most vehicles except maybe full size pickup trucks since they still mostly use the old big body RWD car type suspension. Other full size vehicles might fare well, such as Town Car.
The Aurora was beautiful in the way it handled this annoyance, but totally different suspension design. Wish they'd use it more.
During that run, I changed to sport mode and that knocked nearly all of it out. I could not feel any of it at the steering wheel thanks to Magnasteer.
I suspect all Lacrosse have Magnasteer, which in my opinion could be set a little higher in Touring mode and apparently so for vehicles without Touring Package. Maybe even a little higher in sport mode.
If this sounds like you, see if dealer can check/adjust Magnasteer. It might reduce the annoyance.
I suspect the slightest out of round for the tire will aggravate this condition. Especially if uneven across the tread or mild cupping. Wide tires likely make it more noticeable since the objective is to keep the footprint maximized and even. I assume you've been testing on very smooth road. If driving on less than that, you should see similar motion/vibration, but changing some as you cross imperfections.
#1399 of 2056 Re: Lacrosse Vibration [e_net_rider]
Jan 28, 2011 (5:57 pm)
So, what you are saying is that if I had the ability to change to "sport mode" and "magnasteer" it will go away?
What about the field engineer from GM that drove and inspected the car and said he was stumped? Was that just to shut me up? Even the field repsentative said it was something he would agree was a problem and should be looked into. So now that two GM employees, one service manager and the owner all agree, are we all crazy to think it can be fixed?
Thanks for your input, my frustration with the car and problem may be showing in my words at this point. No disrespect intended towards you or anyone else.
#1400 of 2056 Re: Lacrosse Vibration [50324lacrosse]
Jan 29, 2011 (5:46 am)
I feel your frustration and that is why I attempt to help locate the issue. I could be totally wrong as to the source. Magnasteer is full time and might be on all models.
I remember some complaints a while back related to magnasteer, but I don't remember the particulars. I think it was some thought the magnasteer acted like a power steering booster, they had steering issues, maybe. But the Magnasteer is more like a damper in my knowledge and experience. It uses a speed input on a basic system to decide how much resistance to apply. The amount of electricity applied is likely determined in computer. But questionable whether it will show a code if it fails.
I have not looked at suspension either. If you determine you are at least looking in area of disturbance, then maybe you will get it fixed.