Have 2016 Canyon Duramax that’s been in shop for 150+ days, limp mode codes, loss of power. Had turbo replaced, EGR replaced, throttle body and intake deep cleaned, numerous sensors replaced. Put back together and again failed. Corporate resolution is involved however I cannot get a fraught answer as to ‘at what point is the truck considered unrepairable’? Being told to continue to wait for them to figure it out or pick it up. Might be 6 months, maybe a year. Anyone else have similar experiences?