Dreaded P 056 Code
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Dreaded P 056 Code in Past Cadillac Vehicle Discussion; Son's 1995 Seville SLS is getting the dreaded P056 Transmission Input Speed Sensor code. Check engine light on, I've reset ...
  1. #1
    eldoradogary is offline Cadillac Owners Fanatic
    Automobile(s): 1995 Cadillc Eldorado 2000 Cadillac Seville STS
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    Dreaded P 056 Code

    Son's 1995 Seville SLS is getting the dreaded P056 Transmission Input Speed Sensor code. Check engine light on, I've reset the code several times and it comes back. The transmission shifts just fine and smooth thru all gears. Any help appreciated.

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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    Re: Dreaded PO56 Code

    If the DTC keeps coming back it's obviously detecting a failure in the ISS. Unfortunately it's not easy to get to.
    Attached Images

  4. #3
    eldoradogary is offline Cadillac Owners Fanatic
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    Re: Dreaded PO56 Code

    Thanks Ranger, well so long as everything seems to be fine as far as shifting and operation we'll see how long she will go before failing, will live with the check engine light.

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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    Re: Dreaded P 056 Code

    It's odd that you are not having any shifting problems.

  6. #5
    eldoradogary is offline Cadillac Owners Fanatic
    Automobile(s): 1995 Cadillc Eldorado 2000 Cadillac Seville STS
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    Re: Dreaded P 056 Code

    Quote Originally Posted by Ranger View Post
    It's odd that you are not having any shifting problems.
    I know, shifts just as smooth as my '95 Eldorado, maybe smoother.

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