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  1. Duramax Sixth Generation: 2017-2019 (L5P)
    I see an option on the High Country Duramax for a "High Idle Switch". I have read that the diesel's have an "elevated idle" option (on or off), that will elevate the idle during cold warmups. Could someone confirm that this is true? and what then is the "High Idle Switch" option do? Dealer...
    l5p high idle
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