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Thread: IM Monitors won't set after very simple tune

  1. #1
    Potential Tuner Formula355's Avatar
    Join Date
    Jul 2025
    Posts
    4

    IM Monitors won't set after very simple tune

    This is the second one I have been having problems with getting to set the IM monitors lately.

    Its a bone stock 15 Sierra 5.3
    Did some very minor changes to PE, timing, DOD off of course

    Truck refuses to set the monitors for the oxygen sensors and catalyst even after over 1500 miles.
    I didnt even turn off any codes!

    Anyone have any ideas?

    I attached the stock file as well as mine

    Thanks in advance for any help or ideas.
    Attached Files Attached Files

  2. #2
    Tuner
    Join Date
    Jul 2022
    Location
    Texas
    Posts
    110
    Nothing jumped out at me in the tune. Only thing I can think of would be to "write all" vs just the calibration or go back to the stock tune.