Highway speed vibration on 2020?

bharris515 · November 13, 2019

Had the service bulletin performed yesterday. Night and day difference. Absolutely zero steering wheel shimmy at any speed so far.

Bluedog · November 24, 2019

I've had one front tire replaced, all balanced and road forced twice, and the update applied. No difference at all. Steering wheel still shakes like hell when just a bit of turn is applied from center. It almost feels like my traverse does when the lane correction kicks in. It feels like the electric steering is fighting itself trying to find the steering center.

C'mon GM - its a pretty common problem, and the "fix" - doesn't. Pretty disappointing, especially with a dealer service department that insists they have fixed the problem, but then readily accept it is still there when forced to take a test drive.

BTW - nailed the mechanic for shagging the hell out of my truck and taking it to the local Sonic for lunch by using the myGMC app. Just an FYI.

joelabq · November 24, 2019

Anyone have this shake on tires other than Goodyear? I have had four Ford cars with a shake using Goodyear tires, on the fourth one with Michelin tires I switched my wife's car and it was a miracle. Wondering if that's it this time too?

Sent from my LG-H932 using Tapatalk

Bluedog · December 4, 2019

Back from the dealer for an alignment - seriously out from the factory and rebalanced all four wheels. Shake is still there. Service manager claims it is a widespread problem, and they have had no success at all with things improving after the software update process. GM keeps telling them its not a tire problem, and the update takes care of the issue. Well, it didn't on mine for sure.

Isn't there someone on this board that works for GM? MTUgrad maybe? I'd like to actually talk to someone at GM that might know whats going on instead of their mindless customer service reps that do nothing...

BadStickMan · December 5, 2019

I purchased a 2020 2500 Denali and had the steering wobble and truck vibration at high speeds since day one.
My first trip to the dealership after 500 miles they did the “update” and told me it was fixed. Drove it home and still had the wobble and vibration .
Took to a local shop and had all 4 tires balanced and was told They were out of balance and I was good to go. Drove it home and still had the wobble and vibration.

Just dropped the truck off at the dealership over the weekend and they called me Tuesday and found out after doing a road force balance on all 4 tires that’s they were all out of spec and needed to be replaced under warranty.Went today and picked the truck up after they replaced all the tires and it drives great! No wobble with the steering wheel and no vibration. Huge difference. Highly recommend anyone with the issue find a qualified dealership that does the road force balance because just running the normal balance they will not find out if the tires are bad.
Also found out after asking about making sure the spare wasn’t bad I was told that the spare is a Michelin tire on a 18 inch rim. Haven’t looked under the truck to verify just thought that was odd.

MTU Alum · December 5, 2019

There is two issues: one where the steering wheel shakes after hitting a bump and your more typical tire uniformity shake. The steering calibration fixes the first issue. Tire flat spotting, uniformity, balance are causes of second.

These tires are difficult to balance and I'm not sure if they all have the correct equipment. A proper balance would include driving the truck for 15 minutes to remove flat spots and then road force balance.

#iworkforGM

SkidooSteve12 · December 5, 2019

9 hours ago, MTU Alum said:

There is two issues: one where the steering wheel shakes after hitting a bump and your more typical tire uniformity shake. The steering calibration fixes the first issue. Tire flat spotting, uniformity, balance are causes of second.

These tires are difficult to balance and I'm not sure if they all have the correct equipment. A proper balance would include driving the truck for 15 minutes to remove flat spots and then road force balance.

#iworkforGM

I wonder if a Road Force Balance would show if the tires on my truck are bad? Granted mine is an LT without the digital steering system, but after 3000 miles it still pulls to the left and you can't take your hand off the wheel very long. I drove my Dad's Silverado 1500 last weekend and it is so much easier to steer and goes straight down the road. My 2020 2500HD just feels "heavy" to constantly steer it and takes more effort to turn the wheel.

Bluedog · December 5, 2019

15 hours ago, MTU Alum said:

There is two issues: one where the steering wheel shakes after hitting a bump and your more typical tire uniformity shake. The steering calibration fixes the first issue. Tire flat spotting, uniformity, balance are causes of second.

These tires are difficult to balance and I'm not sure if they all have the correct equipment. A proper balance would include driving the truck for 15 minutes to remove flat spots and then road force balance.

#iworkforGM

The steering calibration did not fix the first condition, it still exists, with no improvement. At all.

I would think that after 4 separate attempts to balance tires and road force at three different facilities, including two certified GM dealers, that issue would be corrected as well. Included is the replacement of one tire - that GM declined to replace under warranty and I had to take care of myself - at my cost.

I take the truck in for the fourth visit next week about this issue, and a few others due to poor workmanship. The dealer knows they have done everything they can to fix the steering, and they are unable to get straight answers from GM on what to do next. But they are documenting everything in case I need to take further action.

GM knows this is a problem with these "difficult to balance" crap tires, as acknowledged by the post quoted above. How about they just start replacing them with another brand. This seems to help the majority of people who have done it. However, after paying $80K for a truck, I loathe the idea of spending another $1250.00 to put decent tires on it to correct a problem that GM knows about, and yet chooses to do nothing about.

At this point - #GMsucks

Edited December 5, 2019 by Bluedog

BB&Chiveon · December 5, 2019

i have mine at dealer today for 3rd time . will see what happens also. the steering recal. did take care of 80-90% of issue i though. is a pain in ass though as you stated for a very expensive truck . i got a survey from GM and i stated my displeasure and they have called 4x and called the dealer to try to fix . GMC Proactive Customer Outreach Team is who called me

Phoenix1 · December 6, 2019

On 12/4/2019 at 10:08 PM, MTU Alum said:

There is two issues: one where the steering wheel shakes after hitting a bump and your more typical tire uniformity shake. The steering calibration fixes the first issue. Tire flat spotting, uniformity, balance are causes of second.

These tires are difficult to balance and I'm not sure if they all have the correct equipment. A proper balance would include driving the truck for 15 minutes to remove flat spots and then road force balance.

#iworkforGM

Phoenix1 · December 6, 2019

My truck has the steering wheel shake after hitting a bump and also had the shake at higher speeds. My dealer did the update that got rid of most the shake at high speed. Is there another fix for the shake after hitting a bump? I also have a lot of play in the steering wheel, about 5 degrees either way. Seems like there is a dead spot from the neutralposition before you can feel feedback from steering. Any suggestions?

MTU Alum · December 8, 2019

On 12/5/2019 at 9:08 AM, SkidooSteve12 said:

I wonder if a Road Force Balance would show if the tires on my truck are bad? Granted mine is an LT without the digital steering system, but after 3000 miles it still pulls to the left and you can't take your hand off the wheel very long. I drove my Dad's Silverado 1500 last weekend and it is so much easier to steer and goes straight down the road. My 2020 2500HD just feels "heavy" to constantly steer it and takes more effort to turn the wheel.

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

MTU Alum · December 8, 2019

I would be equally disappointed if I had to take my new truck to the dealer multiple times to fix the same issue. Dealers should be putting picoscope on these trucks to confirm the issue is tire related. These HD tires can be hard to balance due their high weight, large offsets, and large pilot opening. There is special equipment that is needed for hunter machines to ensure the tire asm is mounted to the machine before road force.

MTU Alum · December 8, 2019

On 12/6/2019 at 1:47 PM, Phoenix1 said:

My truck has the steering wheel shake after hitting a bump and also had the shake at higher speeds. My dealer did the update that got rid of most the shake at high speed. Is there another fix for the shake after hitting a bump? I also have a lot of play in the steering wheel, about 5 degrees either way. Seems like there is a dead spot from the neutralposition before you can feel feedback from steering. Any suggestions?

The deadban on center sounds normal. You need some deadban to help make the steering be not to quick when loaded. The deadban decreases with load and could lead to trailer sway and vehicle stability issues with steering that is too quick.

Bluedog · December 8, 2019

4 hours ago, MTU Alum said:

I would be equally disappointed if I had to take my new truck to the dealer multiple times to fix the same issue. Dealers should be putting picoscope on these trucks to confirm the issue is tire related. These HD tires can be hard to balance due their high weight, large offsets, and large pilot opening. There is special equipment that is needed for hunter machines to ensure the tire asm is mounted to the machine before road force.

Dealer has put the scope on during three of the visits. Shows it is not a tire problem, although it surely must be considered. As per the bulletin, the dealers applied the new calibration as the Y-axis was below 25mg. As I stated above, the calibration did nothing to help the condition. Multiple tire balances and road forces have not either. This is clearly a manufacturing / engineering defect for which GM does not seem to have an adequate repair. I have contacted GM customer service (basically useless) requesting GM TAC work directly with the dealer to rectify this issue when the truck goes in for the FOURTH visit this week.

My dealer is doing the best he can, but when GM won't work with him - other than pointing to a bulletin that does not correct the problem, then its incumbent for GM to step up to the plate and provide a fix, or take the truck back.

We'll see what happens. Where I live, its an hour drive each way to the dealer, and they will not offer a rental, so I have to sit there and wait. What a s*** show this has become.

And MTU Alum - if you would forward this to whoever might actually have a clue, I'd be grateful...