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They just performed this on my truck yesterday. I did notice a "bump" coming to a stop like some people was talking about. But then I also went into Regen on my way home.

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They just performed this on my truck yesterday. I did notice a "bump" coming to a stop like some people was talking about. But then I also went into Regen on my way home.

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What did they do exactly? They talk about engine driven vacuum pump which the Dmax does not have, it uses hydraulic boost from the power steering pump.

As for the bump you feel, my guess would be fuel sloshing in your fuel tank. Typically starts around 3/4 of a tank...
 

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My GMC app shows the brake recall on my 2017 1500, but not on the 2019 Duramax. I do not think this brake recall affects the Duramax.
 

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What did they do exactly? They talk about engine driven vacuum pump which the Dmax does not have, it uses hydraulic boost from the power steering pump.



As for the bump you feel, my guess would be fuel sloshing in your fuel tank. Typically starts around 3/4 of a tank...
Just a programming change.

That was no fuel slosh. It was like the torque converter released late.

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Just a programming change.

That was no fuel slosh. It was like the torque converter released late.

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Same thing I thought. It is more than likely fuel. You should be able to duplicate the feeling in a flat driveway. Just have truck on drive at a stop inch forward slowly and stop. You should feel the bump almost everytime. You can also feel the fuel slosh if you have someone do this for you with your hand through the rear fender well on the rear of the tank. You can feel the slap of fuel on the tank.

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I have almost 13k on my truck. First time it done this.

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Discussion Starter · #8 ·
What did they do exactly? They talk about engine driven vacuum pump which the Dmax does not have, it uses hydraulic boost from the power steering pump.

As for the bump you feel, my guess would be fuel sloshing in your fuel tank. Typically starts around 3/4 of a tank...
Thanks I didn't notice that at first. You are correct.
 
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