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Thread: P1621??????

  1. #1
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    Default P1621??????

    Hey guys....Hoping someone can shed some light on an issue im having. When i REALLY get on my truck, i get a DTC P1621. I will clear code, and light stays on, then after driving the light will go off. On my EFI LIVE its saying Long Term ECM Performance or something to that effect. Any help would be greatly appreciated

  2. #2
    Forum tyhee Site Admin GMPX's Avatar
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    That code should have nothing to do with driving style.
    I seem to recall there was a handheld programmer that used to trigger that code in LLY's, have you (without mentioning names) ever had a handheld programmer flash your truck?

    Cheers,
    Ross
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.


  3. #3
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    yea i have used 2 previously but now have EFI Live

  4. #4
    Forum tyhee Site Admin GMPX's Avatar
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    Well, unfortunately that is where the code is from (one of your previous tuners), if you trawl through the EFILive section on Diesel Place it has been discussed, though it was a while ago. I don't recall there is actually a fix for it though, the ECM has been 'stained'.
    I don't think though with that DTC set it has any negative impact on the truck.

    Cheers,
    Ross
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.


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