Subtle vibration, can of worms opened.

[Sparky176]

Truck in fluid changes and investigate subtle shudder at cruising speeds.  Told them it felt like my ‘14’s shudder when AFM kicked in.  

Dealer #1 :  You need a new torque converter.  
6 weeks later, after causing other damages to my truck, I get the truck back.  Same shudder exists. New, more violent shifts and vibrations at low speed.  After choice words and a few more weeks of waiting for them to replace my running boards supports, I move on to another Dealer.

 

Dealer #2:  The cruising speed shudder is DFM.  (I didn’t realize truck had it.) The TCM/ECM needs updates.  Updates will solve all vibration issues.  

They perform updates, truck seemed ok in lot.  Not a mile down the road, SERVICE BRAKE PAD MONITOR. Dealer #1 stated brakes were at 4mm.  
took truck back to Dealer #2, rear brakes at 2mm and less than 1mm.  
 

New pads/rotors on rear, new pads up front.  

truck seems good. Toggle through menus, brake monitor system is disabled.  Huh?  Why? Turn that sucker on : SERVICE BRAKE SYSTEM!  
 

will not reset manually, automatically, or even after pulling negative bat cable for 30min.  
 

Could the TCM/ECM updates the culprit? 
 

A torque converter diagnosis for a “normal” shudder and now I’m thousands in the hole and the truck still isn’t right!  Beyond pissed.  

[silveradosid]

you are now have to start a case file with GM and hope to get some type of resolution. i have friend who also has his service brakes ligtht on after the dealership replaced his brakes and did the same thing by turning it off.

[GMCustomerService]

Ongoing concerns with no apparent solution is certainly frustrating. Please fill out the form at  with all pertinent details including your username so we can ensure your concerns with your Sierra are routed properly and you get the necessary assistance.