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Phantom 4D Enthusiast

Phantom 4D

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When I shut down my 2023 Sierra 3.0 diesel, there's a noise coming from under the truck. I know it's funny, but it sounds like a small frog croaking. The tech at the dealer said it's the DEF return pump. 

Loadmaster Enthusiast

Loadmaster

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Did it always do this or is it a new noise?  Does it happen every time it is shutdown?  What happens if you start it for just a few minutes and shutdown, does it still make the noise?  Any codes?

Phantom 4D Enthusiast

Phantom 4D

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On 1/6/2024 at 3:53 PM, Loadmaster said:

Did it always do this or is it a new noise?  Does it happen every time it is shutdown?  What happens if you start it for just a few minutes and shutdown, does it still make the noise?  Any codes?

It's always done it. Most times after running around town or say a 120 mile round trip. If I just start it and let it idle, shut it down, normally no noise. No codes. I'm thinking the GM tech is right. The DEF return pump. 

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