Question about Hyundai Elantra

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2001 Hyundai with automatic trans axle. When driving the car the transmission starts going crazy. It down shifts roughly, up shifts and seems to do whatever it wants to as though it is possessed. An OEM speed sensor was installed yesterday, the negative battery cable checked and disconnected from battery for 30 minutes or longer and an additional ground circuit was added to the car as I have read that prior to 2001 there were ground issues. After these items were changed the trans axle acted exactly the same. I have read other articles that suggest replacing both the input and output sensors. Do you have any suggestions? There is also a P1529 code. Thanks for any assistance.

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  • Kevin Alexander
    Kevin Alexander Nov 19, 2009

    How long or how many miles is a drive cycle? It is very hard for me to believe that when a trans axle is out of control that you would suggest completing two complete drive cycles. Do you have any real experience with this problem and two drive cycles corrected the problem?

  • Kevin Alexander
    Kevin Alexander Nov 19, 2009

    2001 Hyundai with automatic trans axle. When driving the car the transmission starts going crazy. It down shifts roughly, up shifts and seems to do whatever it wants to as though it is possessed. An OEM speed sensor was installed yesterday, the negative battery cable checked and disconnected from battery for 30 minutes or longer and an additional ground circuit was added to the car as I have read that prior to 2001 there were ground issues. After these items were changed the trans axle acted exactly the same. I have read other articles that suggest replacing both the input and output sensors. Do you have any suggestions? There is also a P1529 code. Thanks for any assistance.

  • Kevin Alexander
    Kevin Alexander Nov 19, 2009

    While doing research about the codes on ALLDATA there was a diagram that had code P0720 listed and the resolution to that code was to replace the output speed sensor.

  • Kevin Alexander
    Kevin Alexander Nov 19, 2009

    2001 Hyundai with automatic trans axle. When driving the car the transmission starts going crazy. It down shifts roughly, up shifts and seems to do whatever it wants to as though it is possessed. An OEM speed sensor was installed yesterday, the negative battery cable checked and disconnected from battery for 30 minutes or longer and an additional ground circuit was added to the car as I have read that prior to 2001 there were ground issues. After these items were changed the trans axle acted exactly the same. I have read other articles that suggest replacing both the input and output sensors. Do you have any suggestions? There is also a P1529 code. Thanks for any assistance.

  • Kevin Alexander
    Kevin Alexander Nov 19, 2009

    Thank you, I really appreciate your response that is given without insult. Have a great day!

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Hi,

The code you have, P1529, is set in the cars PCM and basically is an information code that says a transmission error has occurred. When this code is set there will be another code set in the TCM, or transmission control module. The code that is set in the TCM is what we need to get us closer to what the failure is. An aftermarket scan tool may not be able to read the codes from the TCM. We need this code to give an accurate answer. However, my experience is that likely you have either a failing input or output speed sensor, or a faulty range switch. Either of these will cause the transmission to failsafe, causing a hard shift concern.


Let me know, if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on Nov 19, 2009

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  • Hyundai Master
  • 17,970 Answers

Code P1529
TCM MIL request signal, this code sets in the computer engine control module when there is a transmission fault code
.

I suggest reviewing the proper installation of speed sensor that you have changed, some short circuit or faulty installation could be generating the error and fails. The speed sensor was changed for some specific purpose?

Posted on Nov 19, 2009

  • ZJ Limited
    ZJ Limited Nov 19, 2009

    First there is a problem with the TCM and the
    other codes code be false codes related to a bad TCM. All the codes are
    electrical codes and can be fixed without rebuilding the tranns.

    P1529 is for a TCM (transmission control module) error. If you have access, review the DTC P1529 TCM error - Invalid message which could be the problem for everything. Code 1529 is a general code which means you have a transmission error code. It means nothing by itself.

    The TCM is the computer that controls all the
    functions of the transmission. Just like the computer that controls the
    engine there is one for the transmission also. Here is the location.




    Also, check it the solenoids of the vales of the system (control fluid pressure, etc.)

    Here have comments from other Hyundai owners with TCM faults...

    Well, I thought I replaced all the sensors , but
    I was wrong. After going to HMASERVICE.COM I found that the input
    sensor is by the air filter box. Not by the front right wheel .I have
    overlooked this (input) sensor. So I went to the wreck yard to see if I
    could find another, just to see if it would make a difference. I found
    most of the cars already missing this sensor. Finally I found one. The
    car was totaled from a head on crash, so I assumed it was running when
    it got hit. I went home and put the new sensor in, still got an engine
    light. I drove to Auto zone (3 miles), with no problem. I was going to
    have them do a code scan. I thought maybe that would clear the codes.
    When I got there I shut off the engine. Then I decided to to see if the
    code was still there, by starting it back up. The engine light didn't
    come back on. I decided I needed to put more miles on it to see if this
    was really the correct fix. So far 75 miles and no symptoms.

    Success.


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  • Master
  • 1,615 Answers

I have Mitchell online. Thier is a TSB. A tech at this point would clear the code. Drive the car for two complete drive cycles to see if it resets the code. If the code came back the recommdation would be to replace the PCM or TCM, For this code it doesnt even say to replace the sensor like you already did so that part was a waste of money.

Posted on Nov 19, 2009

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