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The second day I had my used truck, I had a regen pop up so I stayed on the freeway. Temps went high, overheating, and white smoke was pouring out the back and coolant was being sucked down. Got it in the shop the next day and it was a temperature sensor I think they said. Whatever they did fixed it. No other issues (except disappearing coolant) for almost 2 years, then after the update, I threw a code and my EGR had to be replaced. No issues since.
Not sure if this helps at all but it's what happened to me. I didn't notice any residue. Does it look like crystals similar to DEF?
 

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I don't have any disappearing coolant since the EGR was replaced. I still check probably once a week to see how the level is.
Pretty wild stuff you're having happen. I hope they get it all cleared up.
 
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