Slight clunking noise when coming to stop

Garykk · April 28, 2016

I noticed that for the past couple of days I can hear and slightly feel a clunk towards the rear when I come to a stop. I am thinking it might be the splined shaft on the drive shaft need lube....any thoughts?

Zachlovesfood · April 29, 2016

Man, I had this happening to me recently. I was really worried. Turns out I didn't shut the tailgate hard enough... I had lightly pushed it until it clicked, and apparently that wasn't sufficient. Anyway, I shut it as I would the truck door and viola, clunk be gone. Hope this helps and it's not something worse!

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Edited April 29, 2016 by Zachlovesfood

Chad2815 · April 29, 2016

I had a similar problem and it turned out to be the rear differential bearing.

emeryz28 · April 29, 2016

I had something similar during the first few hundred miles, I believe it was just the transmission learning the downshifts

Garykk · April 29, 2016

Thanks, it's going in for service in a few days so I will bring it up to the service writer for what that is worth..

thearizonacowboy · April 29, 2016

Try holding down the town/haul button for 5 seconds and then release. It should read in the DIC "grade braking disabled". That should make the trans shift smoother in certain situations and may fix what you're experiencing.

Credit goes to OmniGLH and his thread here: http://www.gm-trucks.com/forums/topic/186752-interesting-progress-with-odd-trans-behavior-2015-6-speed/page-1

Glava2876 · May 3, 2016

I noticed that for the past couple of days I can hear and slightly feel a clunk towards the rear when I come to a stop. I am thinking it might be the splined shaft on the drive shaft need lube....any thoughts?

My 2015 Denali 6.2 A8 did this at about 1,200 miles. It actually got pretty loud just as it downshifted 2nd to 1st. The dealer did a recall/ reprogram and it has about 9,000 miles on it now and has never had the problem again.

flatbill · May 21, 2016

This is happening to me and the dealer has no clue what it is and is instructing me to pick up my truck. Because they don't want to charge me for finding it.

rilcoat · May 22, 2016

I have had 2 2015's, 1 sierra double cab SLT and the other is a regular cab LT. I noticed that is driving at a smooth constant speed like 60-70 kms per hour and you remove your foot of the gas pedal the truck will have a small clunk from the rear end. The issue is that the truck is in V4 mode. try to put your truck in manual and hit the up button on your gear selector until the truck says 6 on the dash. now drive normally and you will find that the truck does not go into V4 anymore and the clunk from the rear will disappear completely. I drive in town with my truck in manual 6 all the time. The truck responds better and shifts smoother with no V4 mode. On the hiway I drive in automatic and let V4 work again for more fuel economy.

Hope this helps

Haus_Z71 · May 24, 2016

Try holding down the town/haul button for 5 seconds and then release. It should read in the DIC "grade braking disabled". That should make the trans shift smoother in certain situations and may fix what you're experiencing.

Credit goes to OmniGLH and his thread here: http://www.gm-trucks.com/forums/topic/186752-interesting-progress-with-odd-trans-behavior-2015-6-speed/page-1

Thank you! This was my issue. I created another post about it. Turned off grade control and now it's not giving me harsh 3-2 and 2-1 downshifts.