Question about 2001 Hyundai Sonata

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Engine revs up to 3000-4000 rpm all by itself

Yesterday, I was driving at about 40-45 mph, and all of a sudden the engine revs up to 3000-4000 rpms.  I come to a stop light the engine is still at that same high level of rpms with my foot on the brake.  I found that when I was going up a steep hill, I didn't need to put my foot on the accelerator because I was coasting just fine up a hill at 45 mph.  We parked the car and it wouldn't turn back on.  After not touching it for 30 minutes, we came back to the car and the check engine light was on and the problem was gone.  I have a 2001 Hyundai Sonata Automatic V6.

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  • chevydan04 May 11, 2010

    Have you taken the car to autozone or advanced auto to have the engine code read? What does the code say?

  • Jeimmy Rodriguez Apellido

    Today i solved similar problem on that car. It cable a broken wire wich is located next to the left cushion gum. looks like a black sensor. Check the wires.

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THERE IS A TEMPERATURE SENSOR ON MOTOR WHICH CAUSES THIS PROBLEM... USUALLY IT SHOWS A NEGATIVE TEMP READING WHICH CONFUSES THE COMPUTER CAUSING IT TO REV UP....HAVE THE ENGINE DIAGNOSED ON A SCANNER....GOOD LUCK...

Posted on May 25, 2009

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I want to know did you find out what the problem was? I too also have this annoying f'ing problem where it just revs itself up and down driving me up the wall

Posted on Jun 19, 2012

  • systemfailur
    systemfailur Dec 13, 2012

    The timing belt on the sonata's need to be done at 50,000 miles or it will lead to serious issues

  • andrewgra267 Oct 25, 2015

    Yes it did work for my Sonata 2.5 V6 1999

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