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Error code p21dd


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Check engine light came on and local parts store says it read code p21dd. It a 16 Silverado 3500 with a duramax. Runs good still but was thinking it may be something simple before it goes to dealer.  Thanks for any help in advance 

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I did a search on you tube and saw what it was . I took it to dealer for also a oil change and it was covered under warranty so I was relieved. The bill would of been about $500 but he said that the def stuff was still covered under my warranty. I got 43k on the truck.   Thanks for the response .

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