Question about Hyundai Motor 2002 Elantra

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P0121 - Hyundai Motor 2002 Elantra

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  • martywansink Aug 13, 2008

    I have a 2002 Elantra automatic, and my engine check light came on just last week. These were the problems:

    -sometimes it idles high when I start it up

    -harsh shifts between 2-3 when cold

    -rpm surge on the highway under light load (like the overdrive kicks off, then on again)

    -accelerating from a stop, it sometimes won't go past 2nd gear

    I had the code: P0121 TPS switch "A" circuit range/performance

    The Hyundai dealership doesn't know what to fix next.

    Any suggestions?


  • martywansink May 11, 2010

    Does the TPS also prevent the tranny from shifting into 3rd gear sometimes?

  • gruntsmith
    gruntsmith Mar 09, 2013

    Marty, I'm having the same issue. What fixed the problem?

  • gruntsmith
    gruntsmith Mar 09, 2013

    Marty, what did you do to fix the problem? I'm having the exact same issue.



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P0121 - Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance Problem

The throttle position sensor is probably either damaged, dirty, unplugged, or dead. It's located on the engine. Find the throttle body - the TPS will be the little box on the side of the throttle body - it measures how far open the throttle is, and tells the computer so the computer knows how to direct the car's driving parameters (shift points, fueling, etc).

Posted on Jul 29, 2008

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I have no solution just yet but for those who do not know there is two throttle sensors the tps an the app sensor then there the speed controller cable ...

Posted on Sep 28, 2012


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