Odd sound, regen?

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sam1286

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2013
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Have a 2013 2500. Noticed today when I let off the gas and coast I hear a sound like the engine is slightly revving, but it's not according to the tach. Is this the regen? Is this normal? I have no idea....


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NWRQC

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Most likely it's what Power247 said.
 

Wandell

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I agree. Sounds like you are hearing the exhaust brake.
 
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sam1286

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Brake is turned off.
And it cycles. Like once every couple seconds.
Not sure if that makes sense but it's hard to describe. And have to turn off radio and everything to even hear it. The brake is much louder than that.
 

Power247

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I heard that some guys can hear the egr cycle. I don't know that I have heard it on mine.... Now that I've added a tuner, I won't :)

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