Question about 2009 Jeep Grand Cherokee

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Deceleration whining/humming noise

A whining/humming noise is heard when foot is removed fromt the gas. The sound is more audible at 65 mph decelerating to about 40 mph. The sound is audible at lower velocity around 20-40 mph, but has a less noticable tone. I took it to the dealer and they ran tests and concluded that nothing was wrong and that it may be a computer programing glitch with the gear ratios when downshifting automatically. I have a liftetime powertrain warranty. What should I do?

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  • bbehar Jun 01, 2009

    It is all time 4wd.

  • Richard Scordino May 11, 2010

    Have someone check the differential gears for wear, that kind of noise often comes from low fluid or excessibe gear lash from wear.

  • Eric Shephard May 11, 2010

    Have you had any work done on the differentials or transfer case.

  • Eric Shephard May 11, 2010

    Is the vehicle altime 4wd

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  • 78 Answers

I would tell the dealer you want your rear differential opened up, checked, and more fluid added. There really is no test they can do other than to pop the cover off the differential.

Posted on Jul 10, 2010

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