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I bought a 2015 2500 LTZ with 64,000 miles. Last weekend I got the "Service Emission System" message and the Check Engine light came on. Any guesses what my issue might be?
I've been considering doing a delete - is now the time to take that plunge?
 

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I got the message back middle of january at 66k miles. Turned out to be the DEF tank pump. Repaired under warranty at no charge to me and had it back that same day.
 

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2016 Sierra. Got the same message at like 36K. Troubleshot down to DEF tank level sensor ( Voltage issue ) - My warranty replaced it and was in and out in 4 hours.
 
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