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Thread: GPEC2A Scanner reading negative IAT (-83)

  1. #1
    Potential Tuner
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    Dec 2009
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    GPEC2A Scanner reading negative IAT (-83)

    For some odd reason my scanner reads all GPEC2A equipped Vehicles IAT reading -83. Does anyone have any clue why this is happening and if so please let us know. Is HP tuners even aware of this issue with their scanner software with these specific PCM's?. I've tried both the latest version and the latest Beta version, both yield the same results with a reading of -83.

  2. #2
    Advanced Tuner
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    Mar 2018
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    Illinois
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    I have a GPEC2A controller in my 2015 challenger and the temps read correctly. You have a sample log we can look at? Better yet, did you submit a support ticket to HP?
    https://support.hptuners.com/index.php?/Tickets/Submit

  3. #3
    Advanced Tuner
    Join Date
    Nov 2017
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    815
    Sounds like you need to repoll for supported parameters and choose a different IAT channel.
    If in doubt, multiply everything by 1.1.

  4. #4
    Potential Tuner
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    Dec 2009
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    Hey, thanks for the replies. Yes, here is a data log.
    Attached Files Attached Files

  5. #5
    Potential Tuner
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    Dec 2009
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    I submitted a support ticket about an hour ago. I hope to hear from them by the end of the day.

  6. #6
    Advanced Tuner
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    Mar 2018
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    Illinois
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    Just looked at your log. The SAE Pid looks correct to me. Try logging when the engine is cold and note the ambient temp, if they agree then stick with SAE.
    temp.JPG