Jump to content

2019 Silverado shudder/ vibration

Jeffrey Allen
 Share

Recommended Posts

Jeffrey Allen Enthusiast

Jeffrey Allen

Posted
Posted

Hi everyone, my 2019 Silverado seems to have a shudder/ vibration when cruising on the highway. This happens quite often on my drive to work and back. I put the truck on manual mode and didn't allow it to get into 8th and the shudder/vibration was gone. When I took it into the dealer to have it looked at they called it normal operating but the loaner they lent me had the same issue.  I came across a service bulletin for 2018 Silverado's that called out a transmission fluid change to help with a shudder issue with the torque converter. Has anyone experience these issues and tried this service bulletin or have a different fixed that worked? Any help is greatly appreciated. 

  • Replies 31
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

anthony2558
anthony2558

Quick heads up. No dealership is gonna be interested in fixing anything. You'll get better customer service and satisfaction by going to Taco Bell.

Silverado4x4
Silverado4x4

Take it to the dealer again and tell them there is a TSB 19-NA-121 out for TCC shutter this as it flushes and changes the trans fluid to the new type of Mobile 1 blue label fluid, I had this done abou

Jeffrey Allen Enthusiast

Jeffrey Allen

Posted
  • Author
Posted

I should also add the vibration occurs when the truck has some minor resistance like a flat or slight grade and stops once the truck down shifts or AFM shuts off 

Jeffrey Allen Enthusiast

Jeffrey Allen

Posted
  • Author
Posted

Update just heard back from the dealer. They could not replicate the vibration, which is surprising because it literally does it every drive on the highway. I'm going to give another dealership a shot. Does anyone know what the truck uses to determine when DFM should turn off?

Cpl_Punishment Senior Enthusiast

Cpl_Punishment

Posted
Posted

I've heard a couple guys have issues with specific sections of bad roads. Can you replicate it if you drive other routes besides your normal commute? 

 

Also, which trim/ engine/ transmission do you have? What's your build date? 

Jeffrey Allen Enthusiast

Jeffrey Allen

Posted
  • Author
Posted

Yeah, it happens on almost all of my drives if they involve highway. 19 LT Z71 with the 5.3 8 spd transmission and If I remember correctly a 3:21 gear ratio.  I'd love to know what tells it to go back to 8 cylinders, I imagine it would be rpm. I'm wondering if something as simple as a slightly bigger set of tires would cause it to get out of DFM mode quicker and reduce the shake. 

Bobv07662 Enthusiast

Bobv07662

Posted
Posted

Mine does a similar light shudder when you have your foot barely on the gas. It can do it from 30-40 or from 60-65mph. Change throttle position and it goes away.

HK GUY Enthusiast

HK GUY

Posted
Posted

I test drove a 2018 Sierra SLT 5.3 with the 8 speed yesterday at a Toyota dealership and it did the same thing. The salesman was sitting in the back seat and I asked him if he felt the shudder, he did and wondered what it was. I thought it was occurring when it dropped in 4 cylinder mode so I put it manual mode and 7th gear and it continued to shutter every few seconds.

Sent from my SM-N975U using Tapatalk

Jeffrey Allen Enthusiast

Jeffrey Allen

Posted
  • Author
Posted

There is a service bulletin for 2018s that changes the transmission fluid to help with a torque converter shutter. On my 19 if I put it in manual 7th it won't shutter/vibrate, I don't think it goes into DFM at that rpm on the highway. 

ct_corey Enthusiast

ct_corey

Posted
Posted

Take a ride with the tech who is working on the truck to show them what you are talking about.  Few times I have had to do this to avoid the dealer saying they could not find anything. 

Jeb1300 Enthusiast

Jeb1300

Posted
Posted

our 19 6.2 10 speed does the same thing, dealer drove it and said can not replicate and normal. Watch the tach bouncing around when it happens...definitely an AFM issue. hate it on these new trucks.

Ronald Carlson New Member

Ronald Carlson

Posted
Posted

I am having the same problem with my 2017 Silverado.  It has 28,000 mile on it and I think 20,000 is from it being in the garage.  The dealership that I bought it went out of business and I had taken it to another.  They said they put a new tourque pump in it.  Well the problem is still there!  so I went back and told them and they said bring it back in on Dec. 13, 2019, so they told me to leave it in the morning and they would try something else!  I thought I would take the mileage off when I dropped it off so I did. (this was at 7:45 AM)  3:00 came and I called them and asked about if it was done,  they stated(yes to come and get it)  so I went to the dealership and they told me they couldn't find anything wrong, to come and get one of there trucks and drive it and see if it does the same thing (not sure why other than sell me another truck)  When I got in my truck and checked the mileage it had the same mileage that it had when I parked it !  I called them and they said that they seen the machanic going with the keys!  Really frustrated !!!  They said they would take it for a ride when I came and drove there truck.  Well that isn't going to happen.  I am not sure what to do next or who to contact !!  any advise . 

  • 3 weeks later...
Jeffrey Allen Enthusiast

Jeffrey Allen

Posted
  • Author
Posted

I'm calling another dealership today to give them a shot.  The dealership I bought the truck from doesn't seem to interested in trying to fix anything.  I will post how this trip goes. 

anthony2558 Enthusiast

anthony2558

Posted
Posted

Its AFM / DFM its a know issue. The computer activates AFM / DFM, the cylinders deactivate, engine trans start to vibrate and shutter. Its all garbage and nothing avail to deactivate it. If i put my truck into AUTO instead of 2WD then its does it less, the engine seems to not want to go into AFM / DFM every god darn 5 secs in AUTO

 

anthony2558 Enthusiast

anthony2558

Posted
Posted
On 1/3/2020 at 1:50 PM, Jeffrey Allen said:

I'm calling another dealership today to give them a shot.  The dealership I bought the truck from doesn't seem to interested in trying to fix anything.  I will post how this trip goes. 

Quick heads up. No dealership is gonna be interested in fixing anything. You'll get better customer service and satisfaction by going to Taco Bell.

  • Like 1
  • 9 months later...
Stratman New Member

Stratman

Posted
Posted (edited)

Jeffrey, I have the same issue with my 2019 5.3 8Spd. Only difference is i had the flush done and it made it worse. Have you found any resolutions?

 

Edited by Stratman

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.5k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,914
    Total Members
    8,960
    Most Online
    AidenVorpagel
    Newest Member
    AidenVorpagel
    Joined

  • Who's Online   1 Member, 0 Anonymous, 1,213 Guests (See full list)

  • Latest Articles

  • Posts

    • Grumpy Bear
      Sugar Bears 2015 GMC Terrain SLE-2 2.4 AWD

      By Grumpy Bear · Posted

      286,740 Mile Services   8/6/2026   New AC Compressor. Refrigerant oil and dye, evacuate and charge system.  New exhaust system from cat back.  New Iridium plugs plus replace #3 coil Repair/rewire headlamp wiring (passenger side) and replace all forward bulbs. Polish lenses of both assemblies.  Pull rear rotors, clean and adjust parking assembly. Inspect, clean and grease front calipers. Check pads and shoes.  4 wheel power bleed of brake system. Dot 4 Reset idle speed 50 rpm higher New Serpentine belt.    Will need new pads in the rear in about 5K more miles.    Tax Title and License out the door just short of a grand.    AC clutch had bitten the dust. 1 year warranty on the pick and save replacement. Thing will make a Polar Bear cry Uncle.  He spent quite some time on the wiring. It was in the harness and he does nothing half. I got off cheap. I have considerable more light down the road. Sylvania Silver Star replacements.  Gas seal between the porcelain and shell of plug #3 was blown, cooked the coil. That was the cold miss.  Love the new exhaust. I can sneak into the neighborhood again.  Nice to have a working parking brake again. Belle Tire never got it done. That was disappointing.    This was one of her bigger bills and still way cheaper than a payment even given the oil consumption. This thing cost me under a hundred a month in repairs and normal routine costs. What is my incentive to replace it? 🤔           
    • AidenVorpagel
      cam upgrade in CA

      By AidenVorpagel · Posted

      hello I recently bought a 2012 gmc 1500 with a 5.3 and have a AFM disabler on it I'm interested in doing a cam but I'm worried if I remove the AFM system I will fail smog does anyone have info if they are able to detect that or a work around to it (not talking about hot smogging) please let me know thank you  
    • B14Sierra
      Noise after AFM delete

      By B14Sierra · Posted

      Did you figure it out?
    • B14Sierra
      Possible lifter tick after DOD delete

      By B14Sierra · Posted

      Update. I started chasing down my symptoms. Started first with pulling valve covers and looked at everything. Everything looked good and couldn't hear or feel anything different. Then a compression test. 240 psi or really close on each cylinder. I was worried I was a tooth off of timing. Not bad for an engine with 173,000. Granted I did put new heads on. I sprayed water around the injector area to see if I could hear a change. Nothing. I hooked up my new hp tuner which I should have done in the first place but I don't really know what I'm looking at just yet but am learning. I noticed the fuel trims were way off so that told me I have to have either a bad injector or exhaust leak. New injectors, so I did the shop vac on blower and in the tail pipe. Sprayed soapy water and found the exhaust flange on the drivers side was leaking. I didn't think it would be that considereding I pulled the heads and left the manifolds attached. I did have the transmission replaced not long ago. They must have not seated them properly but I guess I didn't notice. I put in new gaskets on both sides. Which by the way isn't a bad job but I had a hard time getting them to seal right. Took two attempts. Reset the fuel trims and the ticking is gone, engine runs smooth and acceleration has improved. Got to feel the real difference with that stage 1 cam. It's not that big of a difference but it does add a little more. It feels like how the truck should have been from the factory.
    • Grumpy Bear
      Some Assembly is Required

      By Grumpy Bear · Posted

      Can it still be Assembled I?    Stribeck says that we need a certain amount of viscosity under conditions of load and velocity to prevent two surfaces of a know roughness from tearing each other asunder. And we have marketing trying to tell the masses that those two surfaced require less of that commodity due to more exact limits being placed on the same old clearances. We also know that there are limits to how hard something can before it becomes to brittle to be viable and to smooth to 'wet' the surface and that both of those conditions have been known and met since about the Second World War.    That viscosity value shook out at 10 centistokes at 212 F just under a hundred years ago.  Give this a look: [Anton Parr]     What is advertised is the Kinematic viscosity (mm2/s) or that which has been density adjusted but the value we are after is the dynamic viscosity (mPa.s) or true viscosity. You can see that this number is dependent on density thus base stock and temperature. You can also see that an SAE 30 doesn't reach that value in this example. However an SAE 30 that is at the upper end of the SAE 30 range; 12.5 cSt (mm2/s), might. 12.5 * .83 = 10.375 (mm2/s). If you could find an SAE 30 at the upper end these days.   Then there is the complication of viscosity modifiers or VII or VM, whatever you wish to call them. Polymers added to very thin base oils, perhaps 3 to 6 cP oils, that will meet the SAE *W30 spec at 'tested' shear rates and 100 C/212F  target temperature. So a polymer fortified base that is a fraction of the 10 cP requirement Stribeck insist upon.   This could be all well and good if those polymers didn't have two very problematic 'features'. They shear or loose viscosity both 1.) permanently and 2.) temporality. And they do both omitted in the advertised data with the distinct  purpose of deceiving the consumer of the actual operating state of the fluid. I've shown the example of Warren Oils COSTCO 10.91 cSt 5W30 formuation several times where the 100 C HTHS value is 6.9 cP!! That's the temporary shear down and with and SSI or shear stability index of 9.4 cSt. Note the intentional deception in using mixed units?    After a short while that 9.4 cSt oil has a viscosity corrected dynamic value of 7.8 cP. But as the SSI is still within the range of an SAE *W30 whose lower value is 9.3 cSt.    This allows them to continue to call this SAE 16 weight oil a 30 weight, the cake, and still meet the API requirements for fuel efficiency IMPROVEMENT mandated by the EPA. The eating of the cake. By the time you've worn out your motor doing the responsible thing by adhering to the warranty requirements, (the stick), you get deprived of the carrot, wear control. So sad, to bad.   So what can be done? Do I need actually say? [Anton Parr]       Even this must be monitored if the oil is on the low side and the VII an organic or you opt for a 0W40 with an even lighter base oil and more / higher MW VII. (Note the lower density of the 40 weight versus the SAE 30 mono-weight?)    There is another workaround. Temperature. An SAE *W30 run at a bulk temperature of between 180 and 195 F.    Being the belt and suspenders sort I am I do both. Run it cook and run it heavy.    In Part II I'll work the AW package. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...