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23047 miles on 2021 Yukon. DEF system problem warning, check engine light, message that speed limiting would happen in 90 miles. Dealer initially thought it was DEF tank level indicator system, turned out to be DEF injector failure. The part number is 55515114 Injector 3.672. It also required a clamp and an unlabeled part FP number Z5000, description 409657SCG, which I'm guessing is how they document labor charges under warranty.

The dealer covered everything, gave me a rental car to use, included a Lyft ride to and from car rental. No charges. However, they mentioned frequent warranty visits by Duramax diesels in the new design Yukon.

Any place here that we track trends of failures and warranty repairs?
 
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