Judder between 20-40 MPH and 1000-1500 RPMs

[BWesley]

2019 Tahoe LT - 89k miles…all of a sudden last week there has been a judder between 20-40 mph and 1000-1500 rpms. There have been no warning lights, no change in acceleration or shifting in transmission…had it in the shop the last 3 days and they were able to duplicate the problem when driving it, but couldn’t duplicate it in the bay while it was hooked up to the computer to diagnose the problem. They think it might be the vacuum pump but aren’t 100% sure. Anyone else here had this issue? I couldn’t upload the video so the link below is the reel I shared on a FB post

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[petethepug]

@Fless req xfer to gen 4 forum … damn that was fast

 

[NickTransmissions]

2019 Tahoe LT - 89k miles…all of a sudden last week there has been a judder

Judder?

Do you mean to say "shudder" as in torque converter shudder?

 

[tom3]

I'd suggest getting the pan off the transmission quick. See what's in the bottom and how the fluid looks. You might be able to save the transmission at this point - if that's the problem.

 

[phatz_hatz]

2019 Tahoe LT - 89k miles…all of a sudden last week there has been a judder between 20-40 mph and 1000-1500 rpms. There have been no warning lights, no change in acceleration or shifting in transmission…had it in the shop the last 3 days and they were able to duplicate the problem when driving it, but couldn’t duplicate it in the bay while it was hooked up to the computer to diagnose the problem. They think it might be the vacuum pump but aren’t 100% sure. Anyone else here had this issue? I couldn’t upload the video so the link below is the reel I shared on a FB post

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Having same issue with mine, i know the vacuum pump and belt were replaced at 60k, truck has 80,400 on it now, i believe the vacuum pumps are issues with some of these vehicles, unsure what it could be also. Going to bring to dealer probably this week hoping with an answer to what it is. Wife’s daily and she’s been up my ass about it. Problem is it’s very intermittent, can go 3 days no issue than one day on highway it’ll do it briefly than go away. Will let this thread know what dealer says, that is if anyone is still watching this thread