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Cadillac ATS Technical Discussion Forum Discussion, 2013 ats po503 in Cadillac ATS Discussion Forums; for the past few months I noticed my tranny shifting weird I brought it to the dealer and they claimed ...
  1. #1
    romanats is online now Cadillac Owners Fanatic
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    2013 ats po503

    for the past few months I noticed my tranny shifting weird I brought it to the dealer and they claimed nothing wrong meanwhile they reset adaptive and the car was fine for a day or so. I have a Tune from BNR. Today I decided to run a code scan and the code I got was PO 503. I did some research and found its a speed sensor. I cleared the code and will keep an eye on it. Could that make tranny shift erratically.

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    ewired's Avatar
    ewired is offline Cadillac Owners Fanatic
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    What do you mean as weird? Firmness, speed of shift, or the timing(rpm) of the shift. What about downshifting?

  4. #3
    romanats is online now Cadillac Owners Fanatic
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    Thread Starter

    Re: 2013 ats po503

    downshifts are rough and delayed upshifts are firm in traffic it feels like gears are slipping

  5. #4
    redhead_823 is offline Cadillac Owners Member
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    Re: 2013 ats po503

    Yes, the trans controller uses vehicle speed as an input to decide when and how to shift.

  6. #5
    DiabloMike's Avatar
    DiabloMike is offline Cadillac Owners Enthusiast
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    Re: 2013 ats po503

    Do the issues persist if you remove the tune?
    Mike Litsch
    DiabloSport Inc.
    Diablosport.com

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