Question about 2004 Buick Rainier

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There is a loud thud and associated jolt (like a parking lot hit) coming from the rear. Maybe something to do with the suspension? it has a self-levelling suspension. Or -- could be other cause - don't know! It is intermitent - and can't get the vehicle to fault at the service dep't.

Is this normal self-levelling going on? or some other problem?

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  • fly24au Aug 16, 2008

    You are not alone. Mine does it too. And of course - the service department can't get it to duplicate. I need help on this one too!!!

  • famgel Oct 06, 2008

    I have same problem recently dealer replaced a sensor in transmission and didn't fix it. Now their talking about rebuilding or replacing rearend differential, which could cost $1000's.

  • clydedog692 Oct 26, 2008

    We have had the same problem. Going around a corner once, it sounded and felt like the entire undercarriage was going to fall off. Throughout the past two years the service dept has never been able to identify the problem and say no one else has complained of a similar problem.

  • Anonymous Jan 13, 2009

    well a jolting like jumpy or missing gears happens only somtimes and it only happens when im goin very slow,or coming to a stop.

    sounds like its from the bk rear end but it could be the transmision idk

    can somone plz solve this soon.thanks.

  • LynnWiz Jan 15, 2009

    I have the same problem as you all....the thump and then mine actually pulls violently to the right. I have had the transmission and rear sway bars replaced and it still does it. It's at the dealership right now and they are saying they don't feel it and no one else has had this issue. Someone please help us. I just bought this thing!

  • Yngbld14 Apr 06, 2009

    I also have the same problem. As I am driving you can hear a light thumping in the back. I also thought it was the self leveling mechanism, but am finding out others have the same issue. My all wheel drive light is now on, so if anyone could help out that would be great. Or point us in the right direction.

  • Candi Girl Apr 14, 2009

    I have the same problem with my 2005 Buick Rainier. Whenever I am sitting still with the brake on, like at a red light, it jolts from the rear a few times. I've taken it to the dealer and they "can't replicate my concern". I am starting to think I should just sell it and buy something else as I am getting tired of wasting my time at the dealer to end up looking like a women who doesn't know what she's talking about. My husband said it could be the catalytic converter, but the engine temp. is fine. I think it's electrical and has to do with the All-Wheel-Drive.

  • Anonymous May 12, 2009

    I have the same problem with my 2004 Rainier. It has to do with the drive shaft and a broken seal. It needs to be lubed.

  • Kathleen Turner
    Kathleen Turner Aug 14, 2012

    Hello i have had my rainier for a year now and i am going through these problems,does anyone have cheaper solutions other LenImmkeBuicks $$1800,or Mr.Tires$$1800 please call me ASAP614-930-9491


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These are side products of the all wheel drive system, incombo with the locking rear dfferentials.

You'll find the auto-lockers will tend to do that following a tight turn, particularly when you're doing it quickly.

The thud is similar in nature; it's just the All wheel system trying to figure out where to put the power.

Posted on Nov 04, 2008

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I had the same problem, with my 2004 Rainier. It would thud, crack like h_ll in the rearend, when turning or leaving a light. I replaced the motor in the transfercase, it wasn't unlocking all the way from 4 wheel drive. It fixed my problem

Posted on Mar 30, 2012

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This is the air compressor in the rear which helps to stabilize the rear suspension.

Posted on Apr 26, 2009

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