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Is your truck Diesel? I don't know about your model year, but I think I've read that when the engine needs to complete some cycle - I don't remember what they are called - the engine can remain running until complete. Perhaps it's a turbo cool-down cycle?
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2022 Cedar Creek Champagne 38EL - "Big Bertha"
2019 GMC Sierra 3500 Denali HD 6.6L Duramax TD, CC, 4WD, DRW - "Mr. Beefy"
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