Question about 2009 Hyundai Sonata

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Cruise control problem

On the highway every time we hit a small hill ,and i mean small, the car jumps in the passing gear.It is very annoying . It feels like you're losing control of the car. We have just bought thi new car and we are very disappointed with this occurence.
Any fix for this problem?
2009 sonata GL Sport 4 cyl

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  • Samuel Charles Spriggs May 11, 2010

    I think the transmission is just downshifting into the next lowest gear. This is typical with low horsepower vehicles. Except it shouldn't be downshifting on very low grades.



    But, since it's new, have you taken it back to the dealer? -- it must still be under warranty.

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This tranny is programable by the dealer. It takes a little while but they can reset the shift patterns. They did it to my 2009 Sonata.

Posted on Jun 07, 2009

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This is normal for the 2.4 lit 4 cylinder engine. I assume this is the size engine you have in your Sonata. If it isn't, perhaps you should take it in to the Hyundai Service Center and ask them to verify whether or not it's a problem that needs to be fixed under warranty, or whether it's normal.

Posted on May 31, 2009

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