Highway speed vibration on 2020?

[Warren underhill]

I have a 2020 2500 Denali Duramax with 2,000kms . From Day 1 I switched the tires to the Nitto ridge grapplers 35x12.5r20 so I did not set a stock benchmark for the ride quality

As a side note I just traded in my 2019 2500 duramax denali with the same tires but a bit smaller 295/60r20 and the truck drove just perfect!  I have 2 more 3500 DRW in the WT model, one a 2017 and the other a 2017. I am mentioning this because I think I have a good feel for how the trucks should be expected to feel on the road

 

The 2020 truck had a shakey steering wheel at many different speed both slow and highway along with vibrations and just way too much road feed back in my opinion not to mention that dreaded steering column clunk. It also just does not feel solid like the 19 and previous did.

 

I went back to the tire installer for a re balance and then I went to the dealership to have the alignment checked to try and start trouble shooting the problem. After that it was still not fixed so the tire guy actually put a brand new set of ridge grapplers on convinced that there must have been a bad tire... It helped a bit but the shake was still there.

 

I went to the dealership again and he agreed to put the truck back on the alignment rack and check over all steering parts to make sure everything looked "good". He went as far as swapping my wheels with another new stock 2020 to see if it was the tires creating the issue and it showed the issue was still there. After all of that he found the bulletin to re program the digital steering. It has helped a bit but the steering is still less than ideal with a terrible feel and a slight shake still.

 

Does anyone else still have this problem and has anyone found any solution yet. I can not believe we are moving backwards with these kinds of things. It is driving me absolutely crazy and there dealership does not know what to do.

[AT4 HD Ron]

My steering wheel shakes when I take my hands off the wheel, but as long as my hand is on there, there is no shake, nor do I feel any tension or shake.  There is never any vibrations.  Non-issue for me.

[MTU Alum]

12 hours ago, Warren underhill said:

I have a 2020 2500 Denali Duramax with 2,000kms . From Day 1 I switched the tires to the Nitto ridge grapplers 35x12.5r20 so I did not set a stock benchmark for the ride quality

As a side note I just traded in my 2019 2500 duramax denali with the same tires but a bit smaller 295/60r20 and the truck drove just perfect!  I have 2 more 3500 DRW in the WT model, one a 2017 and the other a 2017. I am mentioning this because I think I have a good feel for how the trucks should be expected to feel on the road

 

The 2020 truck had a shakey steering wheel at many different speed both slow and highway along with vibrations and just way too much road feed back in my opinion not to mention that dreaded steering column clunk. It also just does not feel solid like the 19 and previous did.

 

I went back to the tire installer for a re balance and then I went to the dealership to have the alignment checked to try and start trouble shooting the problem. After that it was still not fixed so the tire guy actually put a brand new set of ridge grapplers on convinced that there must have been a bad tire... It helped a bit but the shake was still there.

 

I went to the dealership again and he agreed to put the truck back on the alignment rack and check over all steering parts to make sure everything looked "good". He went as far as swapping my wheels with another new stock 2020 to see if it was the tires creating the issue and it showed the issue was still there. After all of that he found the bulletin to re program the digital steering. It has helped a bit but the steering is still less than ideal with a terrible feel and a slight shake still.

 

Does anyone else still have this problem and has anyone found any solution yet. I can not believe we are moving backwards with these kinds of things. It is driving me absolutely crazy and there dealership does not know what to do.

You could have your dealer clear the calibration offsets in the steering gear.   There has been a few cases were this has helped.  There are going to add this step to the bulletin.

 

#iworkforGM 

[Warren underhill]

Thank you for this information. I will ask them about it.

[silveradolt18]

I too have this shake, it feels worst at 52mph and above.  

Nitto Trail Grappler 35/12.5/20 with hostile 20x10...RF balanced Twice with all 4 tires under 11.

 

taking to dealer tomorrow morning for the service bulletin attached.  I will let you know if it helps.

[Warren underhill]

On 11/1/2019 at 10:43 AM, silveradolt18 said:

I too have this shake, it feels worst at 52mph and above.  

Nitto Trail Grappler 35/12.5/20 with hostile 20x10...RF balanced Twice with all 4 tires under 11.

 

taking to dealer tomorrow morning for the service bulletin attached.  I will let you know if it helps.

How did you make out at the dealer

[silveradolt18]

No improvement at all after the update.

[MTU Alum]

47 minutes ago, silveradolt18 said:

No improvement at all after the update.

Do you get the steering shake after hitting a bump or does it constantly happen over a speed range?

 

#iworkforGM 

[BB&Chiveon]

i had the steering bulletin done monday and drove 70 miles today and i didnt have wobble today . limited miles though

[bharris515]

11 hours ago, BB&Chiveon said:

i had the steering bulletin done monday and drove 70 miles today and i didnt have wobble today . limited miles though

So you could tell a noticeable difference after having the bulletin done?

[BB&Chiveon]

only ran 70 miles so cant make sure its gone , but i didn't notice anything major at least  

[silveradolt18]

21 hours ago, MTU Alum said:

Do you get the steering shake after hitting a bump or does it constantly happen over a speed range?

 

#iworkforGM 

Its more constant at 50+

[silveradolt18]

The dealer told me my VIN was not eligible for the update attached but they “forced” it on.

[BB&Chiveon]

1 hour ago, silveradolt18 said:

Its more constant at 50+

agree 60-80

[silveradolt18]

COMPLETELY RESOLVED!!!

 

Spent half the day with an awesome Discount tire store manager today and truck rides as smooth as my 2018...if not better.

 

here is how it worked:

 

* Road force balanced all 4 under 13

* Switched to a Dynamic  balance As he static balanced the 1st 2 times.

* Replaced one of the brand new Ridge grappler tires as it had a high spot in the road force process

These things as well as the calibration update (see my post above) last week have this dialed in 100%
 

I was losing faith but I can tell those of you that have the issue to stay with it because it is possible to have these trucks smooth as butter all the way up to the 98MPH shutoff.

 

Hope this helps someone else the way you all helped me out.

 

 

Edited November 9, 2019 by silveradolt18