Not the usual diesel knocking - 3.0L Duramax LM2 Diesel I-6

@Native68

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I have a 2020 Sierra AT4 with the 3.0L Duramax; 5th truck, first diesel. I love this truck, especially the torque at low RPM's. I've put about 7,000 miles on it. I am not a hot rodder. I am a 1,500-2,500 RPM driver. At lower RPM (1,500-2,000) the engine sounds more "knocky" than what I wouldn't expect from a diesel. It sounds similar to the knocking of gas engine with low octane fuel. I've checked all electronic diagnostics and the all stats are good (green checks). The only way to eliminate knocking noise is to drive in Sport Mode (higher shift points) or at a higher RPM. Any comments or suggestions?
 
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