Highway speed vibration on 2020?

BadStickMan · December 8, 2019

Here how bad the tires were on mine from the road force balance test they all failed. It rides like a completely different truck after replacing them.

MTU Alum · December 9, 2019

15 minutes ago, BadStickMan said:

Here how bad the tires were on mine from the road force balance test they all failed. It rides like a completely different truck after replacing them.

Technically only right front is out of spec. 45lbs at 60 psi, 50 lbs at 70 psi. Glad to see them replacing tires at lower specs to help fix these trucks.

Edited December 9, 2019 by MTU Alum

SkidooSteve12 · December 9, 2019

20 hours ago, MTU Alum said:

Road force balance will not determine a pull issue with a tire. Dealers are supposed to swap the tires from side to side to determine if there is a tire issue with belt angle.

#iworkforGM

They did swap the tires side to side and said it was all fixed, but it just changed the way the truck pulled from right to left. I will mention it again when I get my oil changed.

I guess I'm thankful that I don't have any shakes or vibration with the LT steering system.

MTU Alum · December 9, 2019

10 hours ago, SkidooSteve12 said:

They did swap the tires side to side and said it was all fixed, but it just changed the way the truck pulled from right to left. I will mention it again when I get my oil changed.

I guess I'm thankful that I don't have any shakes or vibration with the LT steering system.

If the pull direction swapped you may need a new front tire to repair.

Bluedog · December 12, 2019

Truck back from the 4th visit at the dealer to correct the shimmy issues I'm having. Long story short, GM has notified the dealer that this is a "normal operating condition" and it will not pay for further warranty work on this problem. You read that right - GM is now saying that steering wheel shimmy is a feature, and not a defect.

It must be a widespread problem, as I drove 4 brand new trucks on the lot, and all of them had the same issue, one was better, the other three were worse.

What this really means is GM has no fix for the problem and they are trying to wash their hands of it. In all fairness the customer relations person I have been working with has been great at coordinating the dealer, field engineers and TAC to find a resolution. In the end though, TAC has indicated there is nothing else that can be done.

I recommend that everyone that has this problem call GM at 800-462-8782 and ask for the case to immediately be escalated to the Executive Customer Relations team. Don't take no for an answer. Also, since this problem seems not to matter to GM, report the issue to https://www-odi.nhtsa.dot.gov/VehicleComplaint/ as a safety concern.

I can't express how disappointed I am with GMs response to this.

gearheadesw · December 14, 2019

You might want to inform them that, after 3 tries to correct the same problem, it can start to proceed to the lemon law BS.

What a total load of shit, brand new truck, if the wheels and tires aren't the problem, then what is Mr GM????

Bluedog · December 14, 2019

Verbatim from GM: "The condition is considered normal, so there would be no cause for a buyback."

In other words, GM doesn't consider this a defect, so there really isn't a problem. Again, GM washing their hands...

Edited December 14, 2019 by Bluedog

Bluedog · January 9, 2020

GM Customer Care called this morning, and long story short, GM has no known repair for the steering wheel "oscillation" that seems to affect a significant number of trucks. They also reiterated that it is "normal" for the steering wheel to shake, so there is no defect to claim a buyback.

What that means is if you have had the TSB completed that is referenced in this thread, and you still have this problem, you're simply out of luck as far as GM cares. The rep even stated that GM engineering nor TAC are even working on a fix at this time.

Great. An $80K truck with a shaking steering wheel as an engineered "feature."

Christopher Murphy · January 9, 2020

2 hours ago, Bluedog said:

GM Customer Care called this morning, and long story short, GM has no known repair for the steering wheel "oscillation" that seems to affect a significant number of trucks. They also reiterated that it is "normal" for the steering wheel to shake, so there is no defect to claim a buyback.

What that means is if you have had the TSB completed that is referenced in this thread, and you still have this problem, you're simply out of luck as far as GM cares. The rep even stated that GM engineering nor TAC are even working on a fix at this time.

Great. An $80K truck with a shaking steering wheel as an engineered "feature."

I replaced all 4 tires at my expense with new cooper xlt and it magically disappeared. Smooth as butter now. Sold the take offs to tire shop for $400. May want to go this route. Also check all 4 corners ground to fender. These trucks are not level in any way side to side.

IdoMRI · January 11, 2020

I have Michelin on my and no issue at all, up to 80mph has been smooth with no issues.

STEELMAN · January 15, 2020

I too have been dealing with the vibration issue and pulling to the left on my 2020 3500. Got it 4 weeks ago and have put 4400 miles on it, all the while saying that my steering feels loose in addition to the vibration at highway speeds. Going into dealership today for the third time to get two tires replaced as two were off in the road force balance. Also called them in advance to notify them of the service bulletin. Fingers crossed this solves it.

joelabq · January 15, 2020

I knew my truck would have this shake the moment I saw Goodyear tires on it. I've had this fight with my Ford cars is the past few years. I'll be buying Michelin when I wear these out.

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Kdawg007 · January 16, 2020

I had the TSB done a few weeks ago and it fixed it 100%, still on stock tires and no steering wheel shake.

Sonny James · February 6, 2020

On 10/14/2019 at 8:27 PM, MTU Alum said:

Is the vibration in the steering wheel, seat/floor, or both?

#iworkforGM

Hi MTU Alum, since you work for GM I'd like to ask if you know about a problem I am having with my 2020 Siera Denali 3500HD Diesel hat seems transmission related. The first time I went over 70 MPH (after 500 mile break in), I noticed a loud vibration noise. I have learned I can reproduce this issue by finding a gear that will put the truck at 1600 RPM. This includes driving at 73-75 MPH in 10th gear, 68 MPH in 9th Gear, and around 54 MPH in 8th. The more I drive it the more I hear it when shifting through lower gears as the tach reaches 1600 RPM. The noise is like a load howling/cowling noise. Passengers report feeling a vibration coming out of the floor. It's been at the dealer over a week and a half. They had a GM engineer that worked on it for 4.5 hours. He said it wasn't transmission and spent the majority of his time around the intake from what I understand. He had monitors and sensors all over the place and at one point thought he had it fixed. Then when road testing the noise came back. Now I am being asked to talk with a GM district manager. I am also told the dealer found another truck making the same noise. I know they are going to say this is normal. But when I started this process with the dealer, I drove a truck that is 30 VIN numbers less than mine from their lot and it did not have this issue. Rides beautifully. There was one point in time where I was promised that I would receive a new transmission until the GM showed up. They also tried a bolt fix under Bulletin #19-NA-216 with no help. Any insights that you have into this would be much appreciated.

Edited February 23, 2020 by Sonny James
spelling

MTU Alum · February 6, 2020

I'm aware on any issues at 1600 rpm. The dealer should hookup a picoscope and it determines the frequency and order of the vibration. This will point the techs and engineers where to start with their root cause work. Without having that info, it's hard to determine what it could be.

#iworkforGM