I have a 2015 Silverado V6-----It`s not the tires, rims, pinion angle, drive shaft, rear end, front end, shocks, etc...... It`s in the power train, period! Open your hood, (took me awhile to finally look under the hood too) with your truck in park, motor running. You can see the whole motor, trans, vibrates! I videoed it, and its bad. When it started vibrating while at a stop light, that's when I decided to open the hood. One person on here I think nailed the problem, Brandon1282/ After completing all tests found that TCM could not be 'pulse-width' tested, only command on or off. With these measurements we determined that the TCM was sending an erratic signal causing the torque converter to be commanded erratically. This caused potential damage to torque converter. Therefore, I replaced the TCM (Signal) and torque converter (damaged internally). Road tested vehicle; now operating to GM specifications with no vibration when tested under the original conditions.
I knew it wasn't tires or rims when it first started a week after I bought it. Tach is not steady, same vibration, but harder when it down shifts when slowing down.
No power train should be vibrating like this, especially in park at idle. No way to post the video on here, or I would.
Already gave GM there last chance to own up to the problem, tech said everything all the others said on here, it`s up to specs. the dishonesty is apparent from GM tech, the dealer techs, the owner of the dealership, and of course the all trust worthy salesperson. Not!
The first test drive the head service tech admitted it was the power train on the test drive, and pointed out it was the torque converter. also said the transmission is to big for this engine, and that the V8`s don`t vibrate as bad. Wow! But when you get them back to the dealership, mums the word. They blamed it on the tires. second time they kept it for 15 days, even put a new rim on, and tire. The loaner was exactly like mine, except it was a 2016 with a 5.3 V8. It vibrated too with the same whining sound from the trans area. Third time road with a tech who claimed he fixed it by road force balancing the tires, no it`s not the tires I told him, and he explained on the ride along with me that mine was one that didn't have it as bad as others he has ridden in. But back at the dealership, it`s up to specs and there is nothing more they can do. Amazing! Oh and the loaner they had for me the third time, was a $50.000 crew cab 2016 5.3 V8. Same vibration in it as well. sad!
Luckily our lemon law here is pretty strict and supports the consumer, final demand replace and/or refund letter is coming your way GM
Have been buying GM vehicles all my life, have 3 now. 1972 Custom 10 Reg Cab long box, 2011 Equinox, 2015 Silverado reg cab long box, I call the vibrator! Our 72 C-10 which has been in the family since 1974, makes the new truck seam like a fictional GM product.
Disgusting dishonesty being displayed by GM, and it`s dealerships!
P.S. They first claimed that it`s a characteristic of all the trucks, lol! That needs to be on the window sticker then, because I`m not going to purchase a brand new truck that vibrates!