Thread: Need a Case relearn?

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  1. #1 Need a Case relearn? 
    GT Level Member des19's Avatar
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    Hi Guys,

    I just installed my new overkilled pcm and I am wondering if i need a case re learn.

    The thing is, my engine light was on before the install and is still on so I can't tell if I need a case re learn done. I had the check engine light looked at by the dealer years ago i forgot what it was something stupid like the exhaust sensor not worth fixing they said.

    The car started and runs nice. At first it said wouldn't start due to security..but the second turn it worked great and hasn't given me that warning again after many times.

    Now I also would like to know if the tune works before you get a case relearn or do you need a relearn to activate the tune or to make it run better or something???

    Sorry if i seem like a noob when it comes to tuning I have no experience with this that is why i got a pre tuned pcm

    Thanks!
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  2. #2  
    GTP Level Member apierce1289's Avatar
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    If the car starts with the new pcm then you got nothing to worry about. Just enjoy it :-)

    Sent from my Droid Razr using Xparent Red Tapatalk 2
    Gremlins always seem to show up in pairs, or groups of three with our cars...
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  3. #3 Re: Need a Case relearn? 
    Poppin 'em thangs mechguy's Avatar
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    You might be needing a CASE re-learn. Use your scan gauge to check engine codes.
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  4. #4  
    GTP Level Member apierce1289's Avatar
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    If the car starts then you can drive it to a local autozone get the codes pulled from the computer and then post those codes in the forum and then we can help you more.

    Sent from my Droid Razr using Xparent Red Tapatalk 2
    Gremlins always seem to show up in pairs, or groups of three with our cars...
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  5. #5 Re: Need a Case relearn? 
    Poppin 'em thangs mechguy's Avatar
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    I don't know of any place in Canada that will provide a free code retrieval.
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  6. #6  
    GTP Level Member apierce1289's Avatar
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    If you got an auto parts store near you then a regular obd2 scanner should cost around $60. Or if you have an android phone you can get a blue tooth obd2 adapter and the Torque app and read the codes and real time data. The app and blue tooth adapter will cost around $50 if I remember correctly. I'll post links to the stuff you could buy.

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  7. #7 Re: Need a Case relearn? 
    Bastard Reptile's Avatar
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    You always need a case relearn done when you use a different pcm.
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  8. #8  
    GTP Level Member apierce1289's Avatar
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    Quote Originally Posted by Reptile View Post
    You always need a case relearn done when you use a different pcm.
    I have an Overkill tune, never had to do a case learn. Just installed, started it up, and drove ;-)

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    Gremlins always seem to show up in pairs, or groups of three with our cars...
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  9. #9 Re: Need a Case relearn? 
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    It will work but the misfire detection will not work properly.
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  10. #10 Re: Need a Case relearn? 
    The Blue One blueguy's Avatar
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    Quote Originally Posted by apierce1289 View Post
    I have an Overkill tune, never had to do a case learn. Just installed, started it up, and drove ;-)

    Sent from my Droid Razr using Xparent Red Tapatalk 2
    So you got lucky?

    That's basically what you're getting at...right?

    Wait till P0300 and moaarrr funnnzzz
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  11. #11  
    GTP Level Member apierce1289's Avatar
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    I just bought HP tuners Pro so I'll be fine (came in the mail a few days ago) :-P

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  12. #12 Re: Need a Case relearn? 
    Bastard Reptile's Avatar
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    Quote Originally Posted by apierce1289 View Post
    I just bought HP tuners Pro so I'll be fine (came in the mail a few days ago) :-P

    Sent from my Droid Razr using Xparent Red Tapatalk 2
    Then you can get your own relearn done.
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  13. #13 Re: Need a Case relearn? 
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  14. #14 Re: Need a Case relearn? 
    GT Level Member des19's Avatar
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    My buddy has an ob2 I am going to get it scanned to see what code I have then will get back to u guys..is there anyway the PCM can be reflashed by scanning or resetting an engine light code? I don't want to lose my overkill tune
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  15. #15 Re: Need a Case relearn? 
    GTP Level Member Rico's Avatar
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    Quote Originally Posted by des19 View Post
    My buddy has an ob2 I am going to get it scanned to see what code I have then will get back to u guys..is there anyway the PCM can be reflashed by scanning or resetting an engine light code? I don't want to lose my overkill tune
    Most code scanners will erase historic and active DTC's.
    It's a CUMMINS Dodge not a Dodge Cummins
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  16. #16  
    GTP Level Member apierce1289's Avatar
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    Quote Originally Posted by des19 View Post
    My buddy has an ob2 I am going to get it scanned to see what code I have then will get back to u guys..is there anyway the PCM can be reflashed by scanning or resetting an engine light code? I don't want to lose my overkill tune
    It will not in any way effect your overkill performance tune. It will just read the codes that are there.

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  17. #17 Re: Need a Case relearn? 
    GT Level Member des19's Avatar
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    so if i go to reset an engine code it should not affect the overkill tune?
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  18. #18  
    GTP Level Member apierce1289's Avatar
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    Quote Originally Posted by des19 View Post
    so if i go to reset an engine code it should not affect the overkill tune?
    Correct, it will not effect the tune. Because a scanner can only read the pcm, it can't write to the pcm like tuning software can. Therefore there's no need to worry :-)

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  19. #19 Re: Need a Case relearn? 
    GT Level Member des19's Avatar
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    Quote Originally Posted by apierce1289 View Post
    Correct, it will not effect the tune. Because a scanner can only read the pcm, it can't write to the pcm like tuning software can. Therefore there's no need to worry :-)

    Sent from my Droid Razr using Xparent Red Tapatalk 2
    Great. Thanks!
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  20. #20  
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    Gm can rewrite though.
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