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Thread: Is there a way to reset computer to relearn shift points?

  1. #1
    Caught the Bug AgBass01's Avatar
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    Is there a way to reset computer to relearn shift points?

    I recently regeared from 3.21 to 4.56 and my transmission is not shifting when I think it should. It's holding on to each gear a little longer and today I floored it to get up on the highway and it actually hit a rev limiter I guess going from 3rd to 4th. Hit 7000 rpm on the gauge and the throttle died out for a couple seconds then it finally shifted.

    Sent from my SM-G950U using WAYALIFE mobile app

  2. #2
    Meme King WJCO's Avatar
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    You need a calibrator/programmer to access your pcm and change the gear ratio data.
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  3. #3
    Caught the Bug AgBass01's Avatar
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    The shop that did the install changed it for me.
    Quote Originally Posted by WJCO View Post
    You need a calibrator/programmer to access your pcm and change the gear ratio data.
    Sent from my SM-G950U using WAYALIFE mobile app

  4. #4
    Been Around the Block Primo82's Avatar
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    Quote Originally Posted by AgBass01 View Post
    The shop that did the install changed it for me.

    Sent from my SM-G950U using WAYALIFE mobile app
    Sounds to me like they may have screwed something up... I'd take it back and have them reprogram.

  5. #5
    Old Timer Jsouder53's Avatar
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    Quote Originally Posted by Primo82 View Post
    Sounds to me like they may have screwed something up... I'd take it back and have them reprogram.
    ^^^^^^ this

  6. #6
    Caught the Bug AgBass01's Avatar
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    Ok. Thanks for the info. I'll give them a call. I've been looking at the bluetooth OBDII adapter and jscan app as well, might just pull the trigger and check it out myself.

    Sent from my SM-G950U using WAYALIFE mobile app

  7. #7
    Nothing but a Thing Benito's Avatar
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    What size tires did you go to? It also depends on how hard you were mashing the pedal, it’s normal for me to hit redline and shift when getting on the highway out here in west Texas with the short on ramps. I’m on 40s and 5.38 gears, the ‘12-18 5 speed auto is a piece of “shift”. I have never liked the way it shifts and it’s just something I’ve lived with. Have your shop guy check it but don’t expect it to shift like before. I heard that this one company could reprogram the TCM and make the 5sp less of a piece of shit. OSTdyno

  8. #8
    Advertiser Exodus Jeeps's Avatar
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    Sounds like they didn’t actually flash in the new data. They may think they did, but it needs to be verified.


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  9. #9
    Been Around the Block Primo82's Avatar
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    Quote Originally Posted by AgBass01 View Post
    Ok. Thanks for the info. I'll give them a call. I've been looking at the bluetooth OBDII adapter and jscan app as well, might just pull the trigger and check it out myself.

    Sent from my SM-G950U using WAYALIFE mobile app
    I don't think an OBD2 tool can be used to change the programming. There are specialty flash devices for that. Maybe the more expensive tools, but I'm guessing that bluetooth one won't do what you need.

  10. #10
    Addict jesse3638's Avatar
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    Quote Originally Posted by Primo82 View Post
    I don't think an OBD2 tool can be used to change the programming. There are specialty flash devices for that. Maybe the more expensive tools, but I'm guessing that bluetooth one won't do what you need.
    I believe the jscan tool will allow you to set your gear ratio. I thought that if they didn't change ratio the vehicle would go into limo mode? I may be wrong though.

    Sent from my SM-G973U using WAYALIFE mobile app

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