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2021 - 1500 Silverado LTZ Humming noise

REC

By REC
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REC

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2021 with 4300 miles. Humming noise can be heard from cab. Does it at idle. 500rpm, does not matter in gear or not. If you give gas, it stops. Comes back when let off. Stopped by dealership today. Service manager heard it. Bring back friday. Any ideas ? 

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