DEF "contaminated"?

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dbphillips

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Tahoe threw a code yesterday when heading out with 1 segment of the DEF level gauge highlighted (1/8 tank?) and got a DEF contaminated (can't remember if that was the exact word) error and an admonition we'd be held to 65 MPH in 100 miles. Well, I stopped at the one Costco in the area without Peak and walked away empty handed. When I restarted the truck, no code and ran 150 miles with no more issues (picking up a jug of Peak at another Costco along the way). It's been sitting quite a bit the past few months, so I'm guessing the DEF got a little crystallization and once it sloshed around a bit, everything got mixed back up and reabsorbed, making the sensor happier.

Anyone else see this?
 

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